python3 -c " import pdfplumber pdf_path = '/home/daytona/workspace/attachments/…

python3 -c " import pdfplumber pdf_path = '/home/daytona/workspace/attachments/…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspac…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspac…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspac…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspac…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspac…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspac…

ls /home/daytona/workspace/ && python3 -c "import reportlab; print('reportlab ok…

mkdir -p /home/daytona/workspace/infectious-diseases-pdf

~/infectious-diseases-pdf/generate_pdf.py

from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.lib import colors
from reportlab.platypus import (
    SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle,
    HRFlowable, KeepTogether, PageBreak
)
from reportlab.lib.colors import HexColor
from reportlab.platypus.flowables import Flowable

# ── colour palette (highlight-pen look) ────────────────────────────────────
YELLOW   = HexColor("#FFF176")   # yellow highlighter
CYAN     = HexColor("#B2EBF2")   # cyan / teal
GREEN    = HexColor("#DCEDC8")   # green
PINK     = HexColor("#FCE4EC")   # pink
ORANGE   = HexColor("#FFE0B2")   # orange
LAVENDER = HexColor("#EDE7F6")   # lavender
MINT     = HexColor("#E0F2F1")   # mint
RED_HL   = HexColor("#FFCDD2")   # red-pink

DARK_BLUE   = HexColor("#0D47A1")
DARK_GREEN  = HexColor("#1B5E20")
DARK_RED    = HexColor("#B71C1C")
DARK_PURPLE = HexColor("#4A148C")
DARK_TEAL   = HexColor("#004D40")
DARK_ORANGE = HexColor("#E65100")
DARK_GREY   = HexColor("#212121")
MID_GREY    = HexColor("#424242")

PAGE_BG = HexColor("#FAFAFA")
SIDEBAR = HexColor("#1565C0")

W, H = A4

# ── custom page background ─────────────────────────────────────────────────
class PageBackground(Flowable):
    def __init__(self, color=PAGE_BG):
        super().__init__()
        self.color = color

    def draw(self):
        pass  # background handled in onPage

def on_first_page(canvas, doc):
    _draw_page_frame(canvas, doc)

def on_later_pages(canvas, doc):
    _draw_page_frame(canvas, doc)

def _draw_page_frame(canvas, doc):
    canvas.saveState()
    # light background
    canvas.setFillColor(HexColor("#FFFFFF"))
    canvas.rect(0, 0, W, H, fill=1, stroke=0)
    # left colour strip
    canvas.setFillColor(SIDEBAR)
    canvas.rect(0, 0, 0.5*cm, H, fill=1, stroke=0)
    # right colour strip
    canvas.setFillColor(SIDEBAR)
    canvas.rect(W - 0.5*cm, 0, 0.5*cm, H, fill=1, stroke=0)
    # footer
    canvas.setFillColor(HexColor("#E3F2FD"))
    canvas.rect(0, 0, W, 1.1*cm, fill=1, stroke=0)
    canvas.setFont("Helvetica-Bold", 8)
    canvas.setFillColor(SIDEBAR)
    canvas.drawCentredString(W/2, 0.4*cm,
        "Infectious Diseases Notes  |  A Concise Textbook of Surgery  |  Chapters 7, 8, 12 & 13")
    canvas.setFont("Helvetica", 8)
    canvas.drawRightString(W - 1*cm, 0.4*cm, f"Page {doc.page}")
    canvas.restoreState()

# ── style factory ──────────────────────────────────────────────────────────
base = getSampleStyleSheet()

def S(name, **kw):
    """Build a ParagraphStyle."""
    parent = kw.pop("parent", "Normal")
    s = ParagraphStyle(name, parent=base[parent], **kw)
    return s

# Main title
TITLE_STYLE = S("MainTitle",
    fontSize=26, textColor=HexColor("#FFFFFF"), leading=32,
    alignment=1, fontName="Helvetica-Bold",
    backColor=SIDEBAR, borderPadding=(10,16,10,16))

# Chapter heading
CH_STYLE = S("ChapterHead",
    fontSize=15, textColor=HexColor("#FFFFFF"), leading=20,
    fontName="Helvetica-Bold", backColor=DARK_BLUE,
    borderPadding=(6,10,6,10), spaceAfter=6)

# Section heading (h2)
SEC_STYLE = S("SectionHead",
    fontSize=12, textColor=DARK_BLUE, leading=16,
    fontName="Helvetica-Bold", backColor=CYAN,
    borderPadding=(4,8,4,8), spaceAfter=4, spaceBefore=8)

# Sub-section (h3)
SUB_STYLE = S("SubHead",
    fontSize=11, textColor=DARK_GREEN, leading=15,
    fontName="Helvetica-Bold", backColor=GREEN,
    borderPadding=(3,6,3,6), spaceAfter=3, spaceBefore=6)

# Sub-sub (h4)
SUB2_STYLE = S("SubHead2",
    fontSize=10.5, textColor=DARK_PURPLE, leading=14,
    fontName="Helvetica-Bold", backColor=LAVENDER,
    borderPadding=(2,5,2,5), spaceAfter=2, spaceBefore=5)

# Normal body text
BODY = S("Body", fontSize=9.5, leading=14, textColor=DARK_GREY,
         fontName="Helvetica", spaceAfter=3, spaceBefore=1,
         leftIndent=8)

# Bullet
BULLET = S("Bullet", fontSize=9.5, leading=13, textColor=MID_GREY,
           fontName="Helvetica", leftIndent=20, spaceAfter=2,
           bulletIndent=10)

# Highlighted note (yellow)
NOTE_Y = S("NoteYellow", fontSize=9.5, leading=13,
            fontName="Helvetica-Bold", textColor=HexColor("#5D4037"),
            backColor=YELLOW, borderPadding=(3,6,3,6),
            leftIndent=8, spaceAfter=3)

# Highlighted note (orange / important)
NOTE_O = S("NoteOrange", fontSize=9.5, leading=13,
            fontName="Helvetica-Bold", textColor=HexColor("#BF360C"),
            backColor=ORANGE, borderPadding=(3,6,3,6),
            leftIndent=8, spaceAfter=3)

# Highlighted note (pink / warning)
NOTE_P = S("NotePink", fontSize=9.5, leading=13,
            fontName="Helvetica-Bold", textColor=DARK_RED,
            backColor=PINK, borderPadding=(3,6,3,6),
            leftIndent=8, spaceAfter=3)

# Highlighted note (mint / tip)
NOTE_M = S("NoteMint", fontSize=9.5, leading=13,
            fontName="Helvetica-Bold", textColor=DARK_TEAL,
            backColor=MINT, borderPadding=(3,6,3,6),
            leftIndent=8, spaceAfter=3)

# Definition box
DEF_STYLE = S("Def", fontSize=9.5, leading=13,
               fontName="Helvetica-BoldOblique",
               textColor=HexColor("#1A237E"),
               backColor=HexColor("#E8EAF6"),
               borderPadding=(4,8,4,8), spaceAfter=4, leftIndent=8)

def sp(n=4):
    return Spacer(1, n)

def hr(color=HexColor("#BBDEFB"), thickness=1.2):
    return HRFlowable(width="100%", thickness=thickness, color=color, spaceAfter=4, spaceBefore=4)

def chapter(title):
    return [sp(10),
            Paragraph(title, CH_STYLE),
            HRFlowable(width="100%", thickness=2, color=DARK_BLUE,
                       spaceAfter=6, spaceBefore=2)]

def section(title):
    return [sp(6), Paragraph(title, SEC_STYLE)]

def subsection(title):
    return [sp(4), Paragraph(title, SUB_STYLE)]

def subsubsection(title):
    return [sp(3), Paragraph(title, SUB2_STYLE)]

def body(text):
    return Paragraph(text, BODY)

def bullet(text):
    return Paragraph(f"•  {text}", BULLET)

def note_y(text):   # yellow highlight
    return Paragraph(f"★  {text}", NOTE_Y)

def note_o(text):   # orange - important
    return Paragraph(f"✎  {text}", NOTE_O)

def note_p(text):   # pink - warning / danger
    return Paragraph(f"⚠  {text}", NOTE_P)

def note_m(text):   # mint - remember / tip
    return Paragraph(f"●  {text}", NOTE_M)

def defn(text):
    return Paragraph(f"<b>Definition:</b> {text}", DEF_STYLE)

# ── table builder ──────────────────────────────────────────────────────────
def make_table(headers, rows, col_widths=None, header_bg=DARK_BLUE,
               alt1=HexColor("#E3F2FD"), alt2=HexColor("#FFFFFF")):
    data = [headers] + rows
    t = Table(data, colWidths=col_widths, repeatRows=1)
    style_cmds = [
        ("BACKGROUND", (0,0), (-1,0), header_bg),
        ("TEXTCOLOR",  (0,0), (-1,0), colors.white),
        ("FONTNAME",   (0,0), (-1,0), "Helvetica-Bold"),
        ("FONTSIZE",   (0,0), (-1,0), 9),
        ("ALIGN",      (0,0), (-1,0), "CENTER"),
        ("VALIGN",     (0,0), (-1,-1), "MIDDLE"),
        ("FONTSIZE",   (0,1), (-1,-1), 8.5),
        ("FONTNAME",   (0,1), (-1,-1), "Helvetica"),
        ("ROWBACKGROUNDS", (0,1), (-1,-1), [alt1, alt2]),
        ("GRID",       (0,0), (-1,-1), 0.5, HexColor("#90CAF9")),
        ("TOPPADDING", (0,0), (-1,-1), 4),
        ("BOTTOMPADDING",(0,0), (-1,-1), 4),
        ("LEFTPADDING",  (0,0), (-1,-1), 5),
        ("RIGHTPADDING", (0,0), (-1,-1), 5),
        ("ROUNDEDCORNERS", [3]),
    ]
    t.setStyle(TableStyle(style_cmds))
    return t

# ══════════════════════════════════════════════════════════════════════════
#  BUILD CONTENT
# ══════════════════════════════════════════════════════════════════════════
story = []

# ── COVER ──────────────────────────────────────────────────────────────────
cover_title_style = S("CoverTitle", fontSize=28, textColor=colors.white,
                       fontName="Helvetica-Bold", alignment=1, leading=34,
                       backColor=SIDEBAR, borderPadding=(20,30,20,30))
cover_sub_style   = S("CoverSub", fontSize=13, textColor=DARK_BLUE,
                       fontName="Helvetica-Bold", alignment=1, leading=18,
                       backColor=HexColor("#E3F2FD"),
                       borderPadding=(8,12,8,12))
cover_info_style  = S("CoverInfo", fontSize=10, textColor=MID_GREY,
                       fontName="Helvetica", alignment=1, leading=14)

story += [
    sp(60),
    Paragraph("CONCEPT OF INFECTIOUS DISEASES", cover_title_style),
    sp(12),
    Paragraph("Exam-Oriented Study Notes", cover_sub_style),
    sp(20),
    Paragraph("Source: A Concise Textbook of Surgery", cover_info_style),
    sp(6),
    Paragraph("Chapters 7, 8, 12 &amp; 13", cover_info_style),
    sp(6),
    Paragraph("Boil · Abscess · Carbuncle · Cellulitis · Erysipelas", cover_info_style),
    Paragraph("Special Infections · Tetanus · Gas Gangrene", cover_info_style),
    sp(40),
    HRFlowable(width="70%", thickness=3, color=SIDEBAR, hAlign="CENTER"),
    sp(10),
    Paragraph("Prepared for Examination Success", cover_info_style),
    PageBreak(),
]

# ════════════════════════════════════════════════════════════════
# CHAPTER 7 – BOIL, ABSCESS, CARBUNCLE, CELLULITIS, ERYSIPELAS
# ════════════════════════════════════════════════════════════════
story += chapter("CHAPTER 7: BOIL, ABSCESS, CARBUNCLE, CELLULITIS &amp; ERYSIPELAS")

# ── 1. BOIL ──────────────────────────────────────────────────────
story += section("1. BOIL (FURUNCLE)")
story.append(defn("Acute <b>staphylococcal infection</b> of a hair follicle with perifolliculitis; usually proceeds to suppuration and central necrosis."))
story += subsection("Clinical Features")
story += [
    bullet("Painful, indurated swelling that gradually extends"),
    bullet("Tremendous tenderness + surrounding oedema"),
    bullet("After a few days: softening at centre → small pustule on summit"),
    bullet("Pustule bursts spontaneously discharging greenish slough → deep cavity lined by granulation tissue → heals itself"),
    note_y("Blind boil = subsides WITHOUT suppuration | Stye = eyelash follicle infection"),
]
story += subsection("Sites")
story += [
    bullet("Back and neck (commonest)"),
    bullet("External auditory meatus – very painful (skin attached to cartilage, no space for swelling)"),
    bullet("Perianal region – rupture → perianal sinus or fistula"),
]
story += subsection("Complications")
story += [
    bullet("Cellulitis (esp. immunocompromised)"),
    bullet("Hydradenitis (infection spreading to neighbouring follicles, e.g. axilla)"),
    bullet("Secondary regional lymphadenitis"),
]
story += subsection("Treatment")
story += [
    bullet("Improve general health"),
    bullet("Touch of iodine on pustule → hastens necrosis, helps pus drain"),
    bullet("Remove affected hair if pus does not drain spontaneously"),
    bullet("Antibiotics only if multiple or recurrent"),
    bullet("Clean with hexachlorophene after pus drains"),
    note_o("If boils are recurrent → EXCLUDE DIABETES"),
]
story.append(sp(4))

# ── 2. ABSCESS ────────────────────────────────────────────────────
story += section("2. ABSCESS")
story.append(defn("A collection of pus in the body. Three varieties: (i) Pyogenic, (ii) Pyaemic, (iii) Cold abscess."))

story += subsubsection("A. PYOGENIC ABSCESS (Commonest)")
story += subsection("Routes of Infection")
story += [
    bullet("Penetrating wounds (direct infection from outside)"),
    bullet("Local extension from adjacent focus"),
    bullet("Via lymphatics"),
    bullet("Haematogenous spread"),
]
story += subsection("Pathology")
story += [
    body("Suppurative infection → cell death + liquefaction → pus (yellow alkaline fluid with disintegrating/living leucocytes + bacteria)"),
    body("<b>Abscess</b> = cavity filled with pus + lined by <b>pyogenic membrane</b> (dead tissue cells + granulation tissue wall with phagocytic histiocytes)"),
    note_p("<b>Antibioma</b> = firm abscess with sterile pus from continuous antibiotics; may mimic carcinoma"),
]
story += subsection("Clinical Features – 5 Cardinal Signs")
story.append(make_table(
    ["Sign", "Latin Term", "Description"],
    [
        ["Redness", "Rubor", "Hyperaemia before localization"],
        ["Pain", "Dolor", "Throbbing pain = hallmark of pus"],
        ["Heat", "Calor", "Hot (ABSENT in cold abscess)"],
        ["Swelling", "Tumor", "Due to pus in cavity"],
        ["Loss of function", "Functiolaesa", "Especially near joints"],
    ],
    col_widths=[3.5*cm, 3.5*cm, 9*cm],
))
story.append(sp(4))
story += [
    note_y("Detection of pus: elevated temp | brawny oedema + induration (if deep) | FLUCTUATION TEST +ve (if superficial)"),
]

story += subsection("Investigations")
story += [
    bullet("X-ray – fluid levels if gas/air with pus (subphrenic, lung abscess)"),
    bullet("Isotope scan (Technetium) – brain abscess, hepatic abscess, osteomyelitis"),
    bullet("Gallium scan – pelvic, perinephric, mediastinal, subphrenic abscess"),
    bullet("Ultrasound – gallbladder empyema, hepatic/splenic abscess"),
    bullet("CT scan – distinguishes abscess from tumour (necrotic centre)"),
]

story += subsection("Treatment")
story += [
    note_o('"Where there is pus, let it out" – Golden Rule'),
    bullet("Early: elevate + rest + antibiotics (before localization)"),
    bullet("Once localized: DRAIN the pus"),
    note_y("Principles: (i) Drain pus  (ii) Send for C&amp;S  (iii) Give proper antibiotic"),
]

story += subsubsection("Methods of Drainage")
story += [
    bullet("<b>Free/Liberal incision</b>: On most prominent AND most dependent part; bold incision through skin → subcutaneous tissue → deep fascia; muscle incised along line of fibres"),
    bullet("<b>Hilton's method</b>: When important nerves/vessels nearby (neck, axilla, groin); skin incised → artery forceps forced through deep fascia → jaws opened → pus extruded → finger inserted to break all loculi"),
    note_p("<b>Counter-incision</b> needed when prominent ≠ dependent part; sinus forceps passed from first incision to most dependent point → incision made between tips"),
]

story += subsubsection("Site-specific Incisions")
story.append(make_table(
    ["Site", "Incision / Method"],
    [
        ["Neck", "Horizontal along natural crease; Hilton's method"],
        ["Axilla", "3/4 inch behind anterior axillary fold (arm fully abducted); Hilton's method"],
        ["Groin", "Transverse for medial group; Vertical (parallel to femoral vessels) for vertical group"],
        ["Popliteal", "Slightly medial to lateral border of popliteal space; avoid lateral popliteal nerve"],
        ["Gluteal", "Free incision along gluteal maximus fibres (downwards & laterally)"],
        ["Iliac", "Above and parallel to iliac crest; DO NOT open peritoneum"],
        ["Sole/Heel", "Along lateral or medial margin of sole (away from weight-bearing area)"],
    ],
    col_widths=[4*cm, 12*cm],
    header_bg=DARK_TEAL,
    alt1=MINT, alt2=HexColor("#FFFFFF"),
))
story.append(sp(6))

story += subsubsection("B. PYAEMIC ABSCESS")
story += [
    body("Multiple abscesses from <b>infected emboli</b> in pyaemia"),
    body("Associated with: acute osteomyelitis, intracranial sinus inflammation, bacterial endocarditis, portal pyaemia (appendicitis)"),
]
story.append(sp(3))
story.append(make_table(
    ["Term", "Definition"],
    [
        ["Bacteraemia", "Bacteria circulating in bloodstream; usually transient; little clinical significance"],
        ["Septicaemia", "Bacteria in blood (positive blood culture) + clinical manifestations: pyrexia, rigors, hypotension, DIC, petechial haemorrhages"],
        ["Toxaemia", "Toxins (bacterial or chemical) circulating in bloodstream"],
    ],
    col_widths=[4.5*cm, 11.5*cm],
    header_bg=DARK_PURPLE, alt1=LAVENDER, alt2=HexColor("#FFFFFF"),
))
story.append(sp(3))
story += [
    note_y("Features of Pyaemic abscess: Generally MULTIPLE | Subfascial plane | Non-reacting (no calor/rubor/dolor) | Tremendous constitutional disturbance"),
    note_p("Treatment of Septicaemia: Minimum 3 blood cultures → IV antibiotics + aminoglycoside + metronidazole + blood transfusion + plasma expanders + hydrocortisone"),
]

story += subsubsection("C. COLD ABSCESS")
story += [
    body("Cold, non-reacting – NO heat, pain, brawny induration, or oedema"),
    note_y("Almost always a sequel of TUBERCULAR INFECTION (lymph nodes, bone, joint)"),
    bullet("Sites: Neck & axilla (commonest), loin (caries spine), chest wall (TB ribs), bone/joint ends"),
]
story += subsection("Treatment of Cold Abscess")
story += [
    bullet("Full antitubercular regimen"),
    bullet("Aspiration OBLIQUELY through NORMAL surrounding skin (not through prominent/dependent part – causes sinus)"),
    bullet("Local instillation of INH solution after aspiration"),
    bullet("Persist: excise affected lymph nodes as a whole"),
    note_p("NEVER INCISE a cold abscess – almost always leads to secondary infection + persistent sinus"),
]
story.append(sp(4))

# ── 3. CARBUNCLE ──────────────────────────────────────────────────
story += section("3. CARBUNCLE")
story.append(defn("Infective gangrene of the subcutaneous tissue due to <b>Staphylococcus aureus</b>. Gram-negative bacilli and Streptococci may coexist."))
story += [
    note_y("Sites: Nape of neck (commonest – coarse skin, less vitality), back, shoulders, cheek, dorsum of hand"),
]
story += subsection("Pathology")
story += [
    bullet("Staphylococci penetrate deeper skin and subcutaneous fat"),
    bullet("Series of communicating abscesses → multiple openings on surface"),
    note_y("<b>Cribriform/sieve-like appearance = PATHOGNOMONIC of carbuncle</b>"),
    bullet("Central large slough + rosette of small necrosis areas"),
    bullet("In diabetics: may extend to muscle or bone"),
]
story += subsection("Clinical Features")
story += [
    bullet("Predominantly <b>males above 40 years</b>; often <b>diabetic</b>"),
    bullet("Painful, stiff swelling spreading rapidly with marked induration"),
    bullet("Skin: red, dusky, oedematous → multiple vesicles → pustules → burst → multiple openings → coalesce → ulcer"),
    bullet("Floor: ashy-grey slough → eventually heals by granulation tissue"),
]
story += subsection("Treatment")
story += [
    bullet("Improve general health; control diabetes"),
    bullet("Culture + sensitivity; antibiotics (erythromycin if no surface opening yet)"),
    bullet("<b>Local:</b> Anhidrous magnesium sulphate + glycerin paste (osmotic effect) | Hot compress | IR/short wave diathermy"),
    note_o("Surgery indicated: (a) Toxaemia + pain persists despite antibiotics  OR  (b) Carbuncle >2.5 inches in diameter – ONLY when softening present"),
    note_y("<b>Technique:</b> Large CRUCIATE incision to inflammatory margin → clear sloughs → excise tips of 4 skin flaps → vaseline gauze dressing → absolute rest 1 week"),
]
story.append(sp(4))

# ── 4. CELLULITIS ─────────────────────────────────────────────────
story += section("4. CELLULITIS")
story.append(defn("Non-suppurative inflammation spreading along subcutaneous tissues and connective tissue planes across intercellular spaces. Organism: mainly <b>Streptococcus pyogenes</b>."))
story += subsection("Pathology & Clinical Features")
story += [
    bullet("Entry through wound, scratch, or surgical incision"),
    bullet("Wide spread swelling and redness WITHOUT definite localization"),
    bullet("Skin swells → becomes shiny → blebs/bullae (severe) → central necrosis (late)"),
    bullet("Warm, swollen, tender; <b>pitting oedema + brawny induration</b>"),
    bullet("Red streaks = lymphangitis; enlarged, tender regional lymph nodes"),
    note_y("Common in diabetics | Varying degrees of fever and toxaemia"),
]
story += subsection("Treatment")
story += [
    bullet("Rest + elevation to reduce oedema"),
    bullet("Broad-spectrum antibiotics"),
    note_o("If swelling does NOT subside in 48-72 hours → abscess has developed → incision and drainage"),
]
story.append(sp(4))

# ── 5. ERYSIPELAS ─────────────────────────────────────────────────
story += section("5. ERYSIPELAS")
story.append(defn("Acute inflammation of the <b>lymphatics of the skin</b> or mucous membrane. Organism: <b>Streptococcus haemolyticus Group A</b> (Strep. pyogenes)."))
story += subsection("Pathology")
story += [
    bullet("Entry through minor wound/scratch; spreading from inoculation site"),
    bullet("Advancing margin: bright red, slightly raised, IRREGULAR in outline"),
    bullet("<b>Inflammatory cells: mainly lymphocytes and mononuclear cells</b> (NOT PMNs as in ordinary streptococcal infections)"),
    bullet("No pus formation; brown discolouration may remain"),
]
story += subsection("Clinical Features")
story += [
    bullet("Rose-pink rash → extends rapidly (like grease on paper)"),
    bullet("Vesicles appear → rupture → SEROUS discharge (not pus)"),
    bullet("Varying fever and constitutional symptoms"),
]
story += subsection("Cellulitis vs Erysipelas (HIGH-YIELD COMPARISON)")
story.append(make_table(
    ["Feature", "Erysipelas", "Cellulitis"],
    [
        ["Rash", "Rosy, disappears on pressure, stiff", "Not typical"],
        ["Margin", "Sharply defined raised margin (felt > seen)", "Poorly defined"],
        ["Vesicles", "Contain SERUM", "Contain PUS"],
        ["Milian's ear sign", "Spreads to PINNA (cuticular)", "CANNOT spread (no areolar tissue)"],
    ],
    col_widths=[4.5*cm, 6.5*cm, 5*cm],
    header_bg=DARK_RED, alt1=PINK, alt2=HexColor("#FFFFFF"),
))
story += [
    sp(3),
    note_p("<b>Complications of Erysipelas:</b> (1) Sloughing/gangrene (rare; diabetic/debilitated) | (2) Lymphoedema (eyelids, scrotum)"),
]
story.append(PageBreak())

# ════════════════════════════════════════════════════════════════
# CHAPTER 8 – SPECIAL INFECTIONS (GRANULOMATOUS)
# ════════════════════════════════════════════════════════════════
story += chapter("CHAPTER 8: SPECIAL INFECTIONS – GRANULOMATOUS DISEASES")

story.append(defn("<b>Granulomatous inflammation</b> = highly distinctive chronic inflammatory pattern forming a 'granuloma' (tumour-like proliferation of granulation tissue)."))

story += section("Classification of Granulomas")
story.append(make_table(
    ["Type", "Necrosis Character", "Example"],
    [
        ["Caseous", "Soft, friable, cheesy necrotic centre", "Tuberculosis, histoplasmosis, tularemia"],
        ["Gummatous", "Necrosis due to ischaemia → mass of cellular debris", "Tertiary SYPHILIS"],
        ["Suppurative", "Large numbers of PMNs in necrotic centre", "Actinomycosis, blastomycosis"],
        ["Fibrinoid", "Tissue hypersensitivity manifestation", "Rheumatoid arthritis, rheumatic fever"],
    ],
    col_widths=[3.5*cm, 6.5*cm, 6*cm],
    header_bg=DARK_ORANGE, alt1=ORANGE, alt2=HexColor("#FFFFFF"),
))
story.append(sp(4))

story += section("Classification of Granulomatous Diseases")
story += [
    note_y("<b>1. Infective:</b> Bacteria (TB, leprosy, syphilis) | Fungi (actinomycosis, blastomycosis) | Viruses (cat-scratch)"),
    note_m("<b>2. Foreign body:</b> Exogenous (silica, dusting powder) | Endogenous (gouty tophus, xanthogranuloma)"),
    note_p("<b>3. Hypersensitivity:</b> Rheumatic nodules, giant-cell arteritis"),
    note_o("<b>4. Unknown aetiology:</b> Crohn's disease"),
    sp(4),
]

# TUBERCULOSIS
story += section("TUBERCULOSIS")
story += subsection("Routes of Infection")
story += [
    bullet("<b>(1) Inhalation</b> (human type bacillus; droplet spread) → (i) Lungs, (ii) Cervical lymph nodes (via tonsils), (iii) Haematogenous spread: bone, joints, kidney, bladder, testis, peritoneum, brain, eye"),
    bullet("<b>(2) Ingestion</b> (bovine bacillus in non-pasteurized milk; now rare) → intestinal TB → retroperitoneal lymph nodes → bloodstream"),
    bullet("<b>(3) Cutaneous spread</b> (rare; pathologists, butchers, nurses) → <b>Lupus vulgaris</b>"),
]
story += subsection("Pathology – Formation of a Typical TUBERCLE")
story += [
    body("<b>Step 1:</b> Initial lesion = <b>miliary tubercle</b> – tiny collection of histiocytes → epithelioid cells (phagocytosis of bacteria)"),
    body("<b>Step 2:</b> <b>Epithelioid cells</b> – large vesicular nucleus, clear cytoplasm, form epithelioid reticulum"),
    body("<b>Step 3:</b> <b>Foreign body giant cells</b> (Langhans) – 20+ nuclei characteristically grouped; formed by fusion of epithelioid cells; contain tubercle bacilli"),
    body("<b>Step 4:</b> <b>Lymphocytes</b> appear by end of 1st week; source of gamma globulins"),
    note_y("Tubercle is AVASCULAR (no new blood vessels) → this causes CASEATION"),
    body("<b>Step 5:</b> <b>Caseation</b> by end of 2nd week – central necrosis → granular, structureless, cheesy material"),
    body("<b>Step 6:</b> Fibroblast proliferation → fibrous capsule around caseous area"),
]
story += [
    note_o("TYPICAL TUBERCLE = Central caseation → Epithelioid + Giant cells → Lymphocytes → Fibrous zone"),
    note_m("With antitubercular drugs: bacilli die → fibrous tissue invades → HEALED TUBERCLE"),
    note_p("Without treatment: caseation → liquefaction (high bacterial multiplication + high infectivity) → COLD ABSCESS"),
    body("<b>Cold abscess:</b> Soft swelling without acute inflammation | NOT true pus – fatty debris + serous fluid + necrotic cells | Usually STERILE on ordinary culture"),
]

# SYPHILIS
story += section("SYPHILIS")
story.append(defn("Venereal disease caused by <b>Treponema pallidum</b> – delicate spiral spirochaete, 6-15 µm long. Infective in primary and secondary stages (first 2 years). Organism dies rapidly on drying → lesions mostly in moist areas."))

story += subsection("FOUR STAGES")
story += subsubsection("Stage 1 – PRIMARY SYPHILIS")
story += [
    note_y("<b>Incubation period: 3-4 weeks</b>"),
    bullet("<b>Hard chancre (Hunterian chancre)</b>: indurated papule → hard, shallow, non-bleeding, oval/round ulcer; raised hyperaemic edge"),
    bullet("Male: inner surface of prepuce, glans, coronal sulcus | Female: labia minora or cervix (often missed)"),
    note_o("Genital chancres = ALWAYS PAINLESS | Extragenital chancres (anal, lip, tongue, nipple) = MAY BE PAINFUL"),
    bullet("Regional lymph nodes: enlarged, discrete, rubbery, ALWAYS PAINLESS"),
    note_p("Serum tests NOT positive for 2-3 months after chancre → NEGATIVE SEROLOGY DOES NOT EXCLUDE primary syphilis | Diagnosis by dark-ground microscopy"),
]
story += subsubsection("Stage 2 – SECONDARY SYPHILIS (1-6 months after primary)")
story += [
    bullet("<b>Generalised rash</b>: dull red/coppery; pleomorphic (macular, roseolar, papulo-squamous)"),
    bullet("<b>Snail-track ulcers</b>: coalescence of small round superficial erosions in mouth"),
    bullet("<b>Condyloma lata</b>: wart-like growths at mucocutaneous junctions (anus, vulva, perineum); teemed with treponemes"),
    bullet("<b>Generalised painless lymphadenopathy</b>; characteristic = epitrochlear + suboccipital node enlargement"),
    bullet("Less common: sore throat, moth-eaten alopecia, bone/joint pains, iritis, hepatitis"),
]
story += subsubsection("Stage 3 – TERTIARY SYPHILIS (35% of untreated)")
story += [
    body("Mainly affects <b>blood vessels</b>: perivascular lymphocytes + plasma cells (plasma cells = characteristic element)"),
    note_y("<b>Syphilitic endarteritis obliterans</b>: concentric thickening of inner coat of small arteries → ischaemia"),
    note_o("<b>GUMMA</b> (surgically significant): granulation tissue + central necrosis (hypersensitivity) → sloughing/caseation → GUMMATOUS ULCER: painless, punched-out, with WASH-LEATHER SLOUGH on floor"),
    bullet("Diffuse: neurosyphilis, cardiovascular syphilis"),
    note_m("Serum tests ALWAYS POSITIVE in this stage"),
]
story += subsubsection("Stage 4 – LATENT SYPHILIS")
story.append(bullet("Symptomless; serum tests always positive"))

story += subsubsection("Congenital Syphilis")
story += [
    note_y("<b>HUTCHINSON'S CLASSICAL TRIAD:</b> (i) Interstitial keratitis  (ii) 8th nerve deafness  (iii) Hutchinson's teeth (band-shaped deformity of upper central incisors)"),
    note_m("<b>Other stigmata:</b> saddle nose, sabre tibia, Clutton's joint, perforation of palate, parietal bossing"),
]
story += subsection("Treatment of Syphilis")
story += [
    note_o("<b>Drug of choice: PENICILLIN</b> | Procaine Penicillin G 6 lac units/day for 15 days (early) | 3 weeks (late)"),
    bullet("Penicillin-allergic: tetracycline, erythromycin; <b>Doxycycline 100mg TDS × 15 days</b>"),
    bullet("Serological tests at regular intervals for <b>20 YEARS</b> after treatment"),
    note_p("<b>Jarisch-Herxheimer reaction:</b> malaise, pyrexia, rigors after first injection (ONLY in early syphilis) | Prevent with Prednisone 10mg QID × 3 days BEFORE penicillin"),
]

# ACTINOMYCOSIS
story += section("ACTINOMYCOSIS")
story.append(defn("Chronic, suppurative granulomatous disease caused by <b>Actinomyces israelii</b> – anaerobic, gram-positive filamentous organism ('fungus-like')."))
story += [
    body("<b>Source:</b> Normal oral flora; entry via trauma, ulceration, or tooth extraction"),
    note_y("Grows in tissues as yellow colonies visible in pus as <b>'SULPHUR GRANULES'</b> (diagnostic) – seen by naked eye"),
    note_m("<b>Filaments</b> in <b>RADIATE arrangement</b> from centre → called <b>'Ray fungus'</b>"),
    body("<b>Basic pathology:</b> Subacute pyogenic inflammation + considerable induration + <b>multiple sinus formation</b>"),
]
story += subsection("Three Clinical Forms")
story.append(make_table(
    ["Form", "% Cases", "Key Features"],
    [
        ["Facio-cervical", ">50%", "Lower jaw; near carious tooth; over ANGLE OF MANDIBLE; often painless; indurated → multiple sinuses; pus: thin with sulphur granules (diagnostic)"],
        ["Abdominal", "~25%", "Caecum/appendix; large firm mass (mistaken for malignancy); multiple abscesses → abdominal wall → sinuses with sulphur granules in pus; liver (2nd organ): honeycomb mass"],
        ["Pulmonary", "~25%", "Direct spread from neck/abdomen or aspiration; lung riddled with abscess cavities; ultimately chest wall sinuses"],
    ],
    col_widths=[3.5*cm, 2.5*cm, 10*cm],
    header_bg=DARK_TEAL, alt1=MINT, alt2=HexColor("#FFFFFF"),
))
story += [
    sp(3),
    note_y("Spread: NOT by lymphatics | May rupture into vessel → haematogenous to liver, brain, heart, kidney, spleen, ovary"),
    note_o("Treatment: Penicillin (prolonged; 10 mega units/day initially → 4 mega units/day) | Also: lincomycin, tetracycline"),
]

# LEPROSY
story += section("LEPROSY")
story.append(defn("Infectious disease (tropical/subtropical) caused by <b>Mycobacterium leprae</b> – acid-fast bacillus. Source: nasal secretions of lepromatous patients (NOT skin). Associated with poverty + poor hygiene."))

story += subsection("Two Extremes Based on Host Resistance")
story.append(make_table(
    ["Feature", "Lepromatous", "Tuberculoid"],
    [
        ["Host resistance", "LEAST", "STRONG"],
        ["Bacterial load", "Very high; multiplies freely", "Low; few bacilli"],
        ["Cellular response", "Minimal (few macrophages/lymphocytes)", "Strong (epithelioid, giant cells, lymphocytes)"],
        ["Deformity", "Mild, LATE but WIDESPREAD", "Early, SEVERE but LOCALIZED"],
    ],
    col_widths=[4.5*cm, 5.5*cm, 6*cm],
    header_bg=DARK_RED, alt1=PINK, alt2=HexColor("#FFFFFF"),
))
story += [
    sp(3),
    note_o("<b>Most severely deformed patients = BORDERLINE FORMS</b>"),
]
story += subsection("Clinical Features")
story += [
    bullet("Predominantly affects: <b>skin, upper respiratory tract, peripheral nerves</b>"),
    note_y("<b>Predilection for COOL AREAS</b> of body surface; warm areas (axilla, gluteal cleft) unaffected"),
    bullet("Testis affected; ovary and deep organs spared"),
    bullet("Upper respiratory tract (nasal lining) severely involved"),
    note_m("<b>Does NOT affect vital organs → NEVER FATAL from leprosy itself</b>"),
    bullet("Nerves: superficial nerves (posterior auricular, superficial temporal, ulnar) become swollen and tender"),
    note_p("<b>ANAESTHESIA</b> from cutaneous nerve involvement = IMPORTANT DIAGNOSTIC SIGN (often first sign). Disfigurement of hands/feet = damage from LOSS OF PAIN SENSATION, NOT the disease itself"),
]
story += subsection("Treatment")
story += [
    note_o("<b>Dapsone (DDS) 50-100mg/day</b> – selective bacteriostatic drug | 3 years for tuberculoid | 10+ years for lepromatous"),
    note_y("<b>WHO Multidrug Regimen (DDS-resistant):</b> DDS 100mg/day + Clofazimine 50mg/day + supervised monthly Rifampicin 600mg + Clofazimine 300mg × 2 years"),
    bullet("Ethionamide 250mg/day = alternative to Clofazimine"),
    bullet("Surgery: only for deformities"),
]

# AIDS
story += section("AIDS (ACQUIRED IMMUNE DEFICIENCY SYNDROME)")
story.append(defn("Caused by <b>HIV I and II</b> – destroys T-cells → devastates entire immune system. Present in blood and semen. Spreads by sexual contact, infected blood transfusion, transplacental. Mutates very fast → no vaccine possible."))

story += subsection("Clinical Features by System")
story.append(make_table(
    ["System", "Manifestations"],
    [
        ["General", "Asymptomatic 1-2 months; fever, malaise, lethargy, myalgia, lymphadenopathy, sore throat (~30%); thrombocytopenia"],
        ["Chest", "Pneumocystis carinii pneumonia (commonest presentation); also fungi, atypical mycobacteria"],
        ["Skin", "Kaposi's sarcoma (purplish/bluish nodules on limbs → ulcerate → disseminate); severe necrotising Herpes simplex; folliculitis, intertrigo, eczema"],
        ["Abdominal", "Gay Bowel Syndrome – proctocolitis (shigella, salmonella, giardia, E. histolytica); cramping pain + diarrhoea; retroperitoneal lymphadenopathy → obstruction/intussusception"],
        ["Neurological", "~40% have symptoms; meningitis (commonest); cerebral lymphoma; subacute encephalitis; CT scan helpful for cerebral lymphoma"],
    ],
    col_widths=[3.5*cm, 12.5*cm],
    header_bg=DARK_RED, alt1=PINK, alt2=HexColor("#FFFFFF"),
))
story += [
    sp(3),
    note_p("<b>Positive antibody test = only EXPOSURE to virus. Only 50% of seropositive patients progress to full-blown AIDS</b>"),
    note_o("<b>Treatment: No specific treatment. PREVENTION is the main treatment today.</b>"),
]
story.append(PageBreak())

# ════════════════════════════════════════════════════════════════
# CHAPTER 12 – TETANUS
# ════════════════════════════════════════════════════════════════
story += chapter("CHAPTER 12: TETANUS")
story.append(defn("Condition of toxaemia due to absorption of soluble toxin from wounds contaminated with <b>Clostridium tetani</b>."))

story += section("BACTERIOLOGY")
story += [
    bullet("<b>Clostridium tetani</b>: gram-positive, ANAEROBIC rod with terminal round spore (3-4× wider than bacillary body)"),
    note_y("<b>DRUM STICK APPEARANCE</b> (characteristic)"),
    bullet("Found in manure and soil; normal inhabitant of human/animal intestines"),
    bullet("Requires LOW OXYGEN TENSION to grow"),
]
story += subsection("Exotoxin Components")
story.append(make_table(
    ["Component", "Type", "Action"],
    [
        ["Tetanospasmin", "Neurotoxin", "Acts on MOTOR END PLATES"],
        ["Tetanolysin", "Oxygen-labile haemolytic toxin", "Haemolysis"],
    ],
    col_widths=[4*cm, 5*cm, 7*cm],
    header_bg=DARK_RED, alt1=PINK, alt2=HexColor("#FFFFFF"),
))

story += section("INCUBATION PERIOD")
story += [
    note_y("<b>3 days to 3 weeks (average 7 days)</b> | Increased in immunized persons"),
    note_o("<b>LONGER incubation = MILDER attack</b> (important prognostic rule)"),
    note_p("<b>Period of onset</b> (1st symptom → 1st reflex spasm): if <b>&lt;48 hours → ALMOST FATAL</b>"),
]

story += section("MODES OF ENTRY")
story += [
    bullet("Penetrating wound (rusty nail, splinter, thorn) – in 50% of cases wound is slight and healed before tetanus develops"),
    bullet("Dirty abrasions; street injuries with dust or excreta"),
    bullet("Chronic ulcers, boils, paronychia, dental extractions"),
    bullet("Subcutaneous injection of irritant drug (quinine, emetine)"),
    note_m("<b>'Urban tetanus'</b> – complication of narcotic addiction"),
    note_y("<b>Tetanus neonatorum</b> – contamination of cut umbilical cord; child ceases to cry/suck → fever → convulsions; respiratory muscle spasm = common cause of death"),
    note_o("<b>Post-abortal/Puerperal tetanus</b> – unsterile manipulation during abortion or labour"),
    bullet("<b>Postoperative tetanus</b> – breakdown in sterile technique"),
    bullet("<b>Latent tetanus</b> – trivial wound forgotten; months/years later unknown change triggers reactivation"),
]

story += section("PATHOLOGY")
story += [
    body("Anaerobic conditions in wound → spore germination → organism multiplication → exotoxin produced"),
    body("Necrosis + devitalization (vascular injury + thrombosis) are contributory factors"),
    body("Calcium ions (from soil/haemorrhage) further reduce oxygen potential"),
]
story += subsection("How Toxin Reaches CNS (3 Theories)")
story += [
    bullet("Via motor nerve axis cylinders to spinal cord"),
    bullet("Via bloodstream (explains why early effects like trismus/neck stiffness are AWAY from wound)"),
    bullet("Via lymphatics along nerve trunks"),
    note_p("<b>Once fixed to anterior horn motor cells:</b> cannot be detected in CSF; NO AMOUNT OF ATS CAN NEUTRALIZE IT"),
]
story += subsection("Mechanism of Muscle Spasm")
story += [
    note_y("Toxin → EXTREME HYPEREXCITABILITY of anterior horn motor neurones → widespread reflex muscle spasms"),
    note_o("Toxin at inoculation site → INHIBITS CHOLINESTERASE at motor end plates → EXCESS ACETYLCHOLINE → TONIC MUSCLE SPASM"),
]

story += section("CLINICAL FEATURES")
story += [
    note_y("<b>(a) TRISMUS</b> (lockjaw) – MOST COMMON EARLY SYMPTOM + pain and stiffness of neck, back, abdomen"),
    bullet("<b>(b) Dysphagia</b> – may appear first; increases with severity"),
    note_o("<b>(c) RISUS SARDONICUS</b> – characteristic anxious expression; eyebrows + corners of mouth drawn up; spasm of facial and jaw muscles"),
    note_m("<b>(d) OPISTHOTONUS</b> – neck + trunk rigidity; back slightly arched; chronic tonic spasms with incomplete relaxation; psoas/abdominal muscles may rupture"),
    bullet("<b>(e) Reflex spasms</b> – initially from external stimuli; later spontaneous at shorter intervals"),
    bullet("<b>(f)</b> Jaws tightly clenched, head retracted, back arched, limbs extended"),
    note_p("<b>(g)</b> Elevated temperature, rapid pulse; CYANOSIS due to respiratory failure = OMINOUS SIGN"),
]

story += section("SPECIAL TYPES OF TETANUS")
story.append(make_table(
    ["Type", "Key Feature"],
    [
        ["Acute", "Incubation <10 days; GRAVE prognosis"],
        ["Chronic", "Incubation ~1 month; less severe; often had prophylactic antitoxin"],
        ["Delayed/Latent", "Organism latent months/years; sudden reactivation by unknown change"],
        ["Local", "Local contractures near wound; had antitoxin or only segmental cord involvement"],
        ["Cephalic", "Cranial nerve irritation/paralysis; facial nerve most common; ophthalmoplegia, tongue spasm; follows head/face wounds"],
        ["Bulbar", "Extensive spasm of deglutition + respiration muscles; DANGEROUS – death from respiratory spasm"],
        ["Late", "Considerably prolonged inoculation period"],
        ["Tetanus neonatorum", "Umbilical cord contamination; child ceases to cry/suck"],
        ["Recurrent", "Survived patient NOT immune; second attack possible"],
    ],
    col_widths=[4.5*cm, 11.5*cm],
    header_bg=DARK_PURPLE, alt1=LAVENDER, alt2=HexColor("#FFFFFF"),
))

story += section("TREATMENT – A. PROPHYLAXIS")
story += subsubsection("1. Active Immunization")
story += [
    bullet("Formol toxoid or <b>Alum Precipitated Toxoid (APT)</b> or aluminium phosphate-adsorbed tetanus toxoid"),
    note_y("<b>Triple antigen (DTP)</b> = diphtheria + tetanus toxoid + pertussis (for children)"),
    bullet("Adults (>6 years): 0.5ml IM → repeat after 4-6 weeks → repeat after 6-12 months = <b>basic series complete</b>"),
    bullet("Booster every <b>4 years</b>"),
    note_o("Non-immunized with injury: full course | Immunized with injury: booster dose only | Takes ~30 days after initial dose for safe antibody level"),
]
story += subsubsection("2. Passive Immunization")
story.append(make_table(
    ["Agent", "Dose", "Advantages / Disadvantages"],
    [
        ["Equine ATS (horse serum)", "1,500 IU SC/IM", "DISADVANTAGES: (i) Skin test required (anaphylaxis risk) (ii) Effect after 48h, lasts 2 weeks (iii) Previous recipients need larger dose ~30,000 IU"],
        ["Human ATG (Humotet)", "250-500 IU IM/IV + tetanus toxoid", "ADVANTAGES: 100× more effective than ATS | No skin test | No anaphylaxis (homologous antitoxin)"],
    ],
    col_widths=[4*cm, 4*cm, 8*cm],
    header_bg=DARK_TEAL, alt1=MINT, alt2=HexColor("#FFFFFF"),
))
story += [
    sp(3),
    note_p("<b>3. Proper Debridement</b> – MOST IMPORTANT prophylactic measure; remove all dead tissues, blood clots, foreign bodies"),
    note_m("<b>4. Antibiotic</b> – Penicillin 10 lac units IM BD; bacteriostatic against Cl. tetani + eliminates pyogenic organisms that help germination"),
]

story += section("TREATMENT – B. ESTABLISHED CASES")
story += [
    bullet("1. Passive immunization: <b>Humotet 4,000 units</b> + tetanus toxoid; if unavailable: 1 lac units ATS (half IV + half IM)"),
    bullet("2. Antibiotics: <b>Penicillin 10 lac units every 4 hours</b> + Metronidazole (lung protection); alternative: tetracycline"),
    bullet("3. Wound care: thorough cleansing + debridement; remove all necrotic tissue + foreign bodies; remove all stitches; <b>leave wound OPEN</b>"),
    bullet("4. Isolation: quiet, dark, well-ventilated room; NO external stimuli"),
]
story += subsection("Severity-Based Treatment")
story.append(make_table(
    ["Severity", "Management"],
    [
        ["MILD\n(only tonic rigidity; no dysphagia/reflex spasms)", "Sedate: Promazine 200mg IM + Barbiturate OR Diazepam 5-40mg IV; repeat 4× in 24 hours"],
        ["MODERATE\n(dysphagia + reflex spasms; no cyanotic convulsions)", "NGT + self-retaining catheter + IV fluids + I/O chart + sedation + consider tracheostomy + suction + humidification"],
        ["SEVERE\n(cyanotic convulsions)", "Tubocurarine 40mg IV (muscle relaxant) + tracheostomy under LA + positive pressure ventilation + pentothal sedation + NGT feeding + continuous catheterization + IV fluids + constant nursing; STOP ventilator when convulsions cease (~14 days after relaxants stopped)"],
    ],
    col_widths=[4.5*cm, 11.5*cm],
    header_bg=DARK_RED, alt1=RED_HL, alt2=HexColor("#FFFFFF"),
))

story += section("CAUSES OF DEATH IN TETANUS")
story += [
    note_p("<b>1. Lung complications (COMMONEST)</b>: bronchopneumonia | aspiration | laryngeal spasm → airway obstruction | pulmonary embolism (excessive sedation)"),
    bullet("2. Drug intoxication (especially barbiturates)"),
    bullet("3. Anaemia and exhaustion from repeated convulsions → coma"),
    bullet("4. Hyperpyrexia + exotoxin effects on brain"),
    bullet("5. Anaphylaxis to equine/bovine ATS (now prevented by skin test + Humotet)"),
    bullet("6. Compression fracture of thoracic vertebra from tetanic contractions"),
    bullet("7. Co-existing diseases: peptic ulcer perforation, cardiac rupture"),
    note_y("<b>Modern treatment reduces mortality to ~15% overall</b>; still high in children and elderly"),
]
story.append(PageBreak())

# ════════════════════════════════════════════════════════════════
# CHAPTER 13 – GAS GANGRENE
# ════════════════════════════════════════════════════════════════
story += chapter("CHAPTER 13: GAS GANGRENE (CLOSTRIDIAL MYONECROSIS)")
story.append(defn("Rapid spreading infective gangrene of <b>muscles</b> characterized by collection of <b>gas in muscles and subcutaneous tissue</b>, caused by <b>Clostridial infection</b>."))

story += section("AETIOLOGY & PREDISPOSING FACTORS")
story += [
    note_y("Two simultaneous requirements: (i) Entry of Clostridial organisms (mainly Cl. perfringens) + (ii) Anaerobic conditions within the wound"),
]
story += [
    bullet("Haemorrhage and blood clot – supply calcium"),
    bullet("Contamination with manured soil – Clostridial organisms + silica + calcium"),
    bullet("Laceration and crush injuries – organisms cannot multiply in healthy tissue"),
    bullet("Aerobic co-organisms (Staph, Strep, Proteus) – consume oxygen → anaerobic environment"),
    bullet("Circulatory obstruction – occluded/damaged artery, tourniquet, tight bandage"),
    bullet("Inadequate drainage + exudation in muscle fibres"),
    bullet("Diabetes and occlusive arterial disease"),
]

story += section("BACTERIOLOGY")
story += [
    note_o("<b>Main organism: Clostridium perfringens (Cl. Welchii)</b> – anaerobic"),
    bullet("Others: Cl. oedematiens, Cl. septicum, Cl. histolyticum, Cl. bifermentans"),
    bullet("Found in stools → <b>buttock, perineum, thigh wounds</b> more often affected | Also occasionally in normal vaginal flora"),
]
story += subsection("Exotoxins of Cl. Welchii")
story.append(make_table(
    ["Toxin", "Action"],
    [
        ["Alpha toxin (Lecithinase)", "Haemolytic; splits lecithin → phosphocholine + diglyceride"],
        ["Collagenase", "Proteinase; breaks down collagen"],
        ["Hyaluronidase", "Breaks down hyaluronic acid (cement of muscle cells + barrier against infection)"],
        ["Theta toxin", "Haemolytic, lethal, necrotic (weaker than lecithinase)"],
        ["Leucocidin", "KILLS LEUCOCYTES"],
    ],
    col_widths=[5*cm, 11*cm],
    header_bg=DARK_RED, alt1=ORANGE, alt2=HexColor("#FFFFFF"),
))
story += [
    sp(3),
    note_m("<b>Saccharolytic group (Cl. Welchii)</b>: breaks down muscle glycogen → CO₂ + H₂ + lactic acid"),
    note_y("<b>Proteolytic group</b>: produces aminoacids → breaks down to <b>ammonia + H₂S + other noxious gases</b> (responsible for foul smell); ammonia neutralizes acid"),
]

story += section("PATHOLOGY")
story += [
    body("Clostridial invasion affects <b>whole muscle from origin to insertion</b> → foul-smelling necrosis"),
    note_y("<b>Colour progression:</b> Dull red → Green → <b>BLACK</b> (H₂S acting on iron from broken-down muscle haemoglobin)"),
    bullet("Earliest change: rapidly spreading oedema of subcutaneous tissue + muscle + gas accumulation"),
    bullet("Collagen fibres: swollen → fragmented → broken down"),
    bullet("Blood vessel damage → endothelial cell destruction → necrosis propagates"),
    bullet("Muscle loses: striation, nuclei, contractility, normal colour → soft, friable, green to black"),
    bullet("Gas spreads along LONG AXIS of muscle sheath; initially odourless → becomes foetid"),
    note_p("Septicaemia → gas may appear in liver = <b>'FOAMING LIVER'</b>"),
]

story += section("TYPES OF GAS GANGRENE")
story.append(make_table(
    ["Type", "Description"],
    [
        ["Clostridial Cellulitis", "Crepitant infection of necrotic tissue; HEALTHY MUSCLE NOT INVOLVED; foul-smelling seropurulent infection; local fascial spread; predominant = non-toxigenic Clostridia; gradual onset (incubation 3-5 days); skin rarely discoloured; little/no oedema"],
        ["Single muscle type", "Infection limited to one muscle only"],
        ["Group type", "Limited to one muscle group (extensors of thigh, adductors, glutei)"],
        ["Massive type", "Involves almost entire muscle mass of one limb"],
        ["Fulminating type", "Spreads very rapidly even beyond the limb; intense toxaemia; HIGH FATAL RATE"],
    ],
    col_widths=[4*cm, 12*cm],
    header_bg=DARK_ORANGE, alt1=ORANGE, alt2=HexColor("#FFFFFF"),
))

story += section("CLINICAL FEATURES")
story += subsection("General")
story += [
    bullet("Patient looks <b>anxious and anaemic</b>"),
    note_y("Temperature: may NOT be high; in severe cases may be <b>SUBNORMAL</b> (toxins suppress suprarenal gland)"),
    bullet("Rapid pulse, falling blood pressure"),
    bullet("Vomiting; patient remains <b>MENTALLY NORMAL</b> (differentiates from septic encephalopathy)"),
]
story += subsection("Local")
story += [
    bullet("Pain in affected limb"),
    bullet("Gradual swelling + gross oedema (stitches may give way)"),
    note_p("<b>Most characteristic feature:</b> PROFUSE BROWNISH, FOUL-SMELLING DISCHARGE between sutures"),
    note_y("Skin: <b>khaki to greenish</b> (due to haemolysis)"),
    note_o("<b>CREPITUS</b> (pathognomonic): palpable and sometimes audible with stethoscope – gas in muscle + subcutaneous tissue"),
    bullet("Visible muscle: green to black in colour"),
]

story += section("SPECIAL INVESTIGATIONS")
story += [
    bullet("<b>1. Direct Gram stain of exudate</b>: thick rectangular bacilli = Cl. Welchii/Cl. bifermentans; spores usually NOT seen in Cl. Welchii"),
    bullet("<b>2. Cultures</b>: anaerobic cultures from exudate"),
    note_y("<b>Nagler reaction</b>: direct plate culture; lecithinase of Cl. Welchii splits serum lipoprotein → insoluble precipitate (opacity in culture medium) = rapid serological detection"),
    bullet("<b>3. X-ray</b>: gas shadows within muscle and subcutaneous tissue"),
]

story += section("TREATMENT – I. PROPHYLAXIS")
story += [
    bullet("<b>1. Wound excision/debridement</b>: excise margins; remove all devitalized tissue, blood clots, foreign bodies, dead/damaged muscle, completely detached bone fragments"),
    note_o("<b>2. High-dose Penicillin</b> (~2g every 4 hours) – one of the FEW indications for prophylactic antibiotics"),
    bullet("<b>3. Avoid tourniquet</b> during wound excision; ensure plasters do not jeopardize blood supply"),
    bullet("<b>4. Leave wound OPEN</b> rather than apply primary sutures under tension"),
    note_m("<b>5. Passive immunization</b>: Polyvalent AGS 22,500 IU (9,000 Cl. Welchii + 4,500 Cl. septicum + 9,000 Cl. oedematiens) every 4-6 hours; prophylactic value still debatable"),
    bullet("<b>6. Active immunization</b>: APT toxoid; 2 doses at 2-6 week interval + booster 3-9 months later"),
]

story += section("TREATMENT – II. ESTABLISHED CASES")
story.append(note_p("<b>Early and adequate surgery is the MOST EFFECTIVE treatment. A 24-hour delay may prove FATAL.</b>"))

story += subsection("1. Surgery")
story += [
    bullet("<b>(a)</b> Multiple <b>longitudinal incisions</b> for decompression and drainage – URGENTLY"),
    bullet("<b>(b) Aggressive debridement</b>: excise all devitalized tissue"),
    body("&nbsp;&nbsp;&nbsp;• <b>Single muscle type</b>: completely excise affected muscle"),
    body("&nbsp;&nbsp;&nbsp;• <b>Group type</b>: remove affected portions until healthy muscle reached (identified by colour, contractility, bleeding)"),
    note_p("<b>(c) Massive type or delayed diagnosis: AMPUTATION is the only answer</b>"),
]
story += subsection("Principles of Amputation for Gas Gangrene")
story += [
    bullet("<b>Avoid tourniquet</b> (bleeding from muscle = viability indicator)"),
    bullet("<b>Guillotine type</b> WITHOUT stump closure (for better drainage)"),
    note_y("Level: well <b>PROXIMAL to affected muscles</b> (e.g., mid-thigh amputation for calf muscle involvement)"),
]

story += subsection("2. Supportive Treatment")
story += [
    bullet("<b>(i)</b> Penicillin 10 lac units every 4 hours + Tetracycline 2g/day OR Chloramphenicol 2g/day OR Streptomycin 1-2g/day"),
    bullet("<b>(ii)</b> Blood transfusion (pre-operatively to combat shock + anaemia) + crystalloid/colloid IV"),
    bullet("<b>(iii)</b> Anti-gas gangrene serum (same dose as prophylaxis) × 3 times every 4-6 hours = 3 ampoules polyvalent antitoxin"),
    note_m("<b>(iv) Hyperbaric oxygenation</b> (where available): limb placed in hyperbaric oxygen chamber post-operatively; used with some success"),
]

# ── FINAL COMPARISON TABLE ────────────────────────────────────────
story.append(PageBreak())
story += chapter("QUICK REVISION: HIGH-YIELD COMPARISON TABLES")

story += section("Common Surgical Infections – At a Glance")
story.append(make_table(
    ["Feature", "Boil", "Carbuncle", "Cellulitis", "Erysipelas"],
    [
        ["Organism", "Staph. aureus", "Staph. aureus", "Strep. pyogenes", "Strep. haemolyticus Group A"],
        ["Tissue involved", "Single hair follicle", "Multiple communicating SC abscesses", "SC + connective tissue planes", "Lymphatics of skin"],
        ["Pus", "Yes (single point)", "Yes (multiple openings)", "Develops if untreated", "NO (serum in vesicles)"],
        ["Hallmark/Pathognomonic", "Single pustule", "Cribriform/sieve-like appearance", "Brawny induration, pitting oedema", "Sharply defined raised rosy rash; Milian's ear sign"],
        ["Treatment", "Iodine touch, drain", "Cruciate incision (with softening)", "Antibiotics + elevation", "Antibiotics (penicillin)"],
    ],
    col_widths=[3*cm, 3.5*cm, 3.5*cm, 3.5*cm, 3.5*cm],
    header_bg=DARK_BLUE,
))

story.append(sp(8))
story += section("Tetanus vs Gas Gangrene – Key Differences")
story.append(make_table(
    ["Feature", "Tetanus", "Gas Gangrene"],
    [
        ["Organism", "Cl. tetani (drum stick)", "Cl. perfringens/Cl. Welchii"],
        ["Mechanism", "Exotoxin (tetanospasmin) → motor end plate", "Exotoxins → muscle necrosis + gas"],
        ["Hallmark", "Trismus, opisthotonus, risus sardonicus", "Crepitus, foul-smelling brownish discharge"],
        ["Mental status", "NORMAL", "NORMAL"],
        ["Temperature", "Elevated", "May be SUBNORMAL in severe cases"],
        ["Toxin neutralization", "ATS/ATG before fixation to anterior horn", "Polyvalent AGS"],
        ["Key treatment", "Debridement + Humotet + penicillin + sedation", "Urgent surgery + amputation if massive + penicillin"],
    ],
    col_widths=[4*cm, 7*cm, 5*cm],
    header_bg=DARK_RED, alt1=PINK, alt2=HexColor("#FFFFFF"),
))

story.append(sp(8))
story += section("Abscess Types – Key Differences")
story.append(make_table(
    ["Feature", "Pyogenic", "Pyaemic", "Cold (TB)"],
    [
        ["Character", "Single, hot, painful", "Multiple, subfascial, non-reacting", "Cold, non-reacting"],
        ["Organisms", "Pyogenic bacteria", "Infected emboli", "Mycobacterium tuberculosis"],
        ["Pus", "True pus, culture positive", "True pus (multiple)", "NOT true pus; usually sterile"],
        ["Drainage", "Free incision or Hilton's method", "Drain + treat source", "NEVER incise; oblique aspiration"],
        ["Fever", "Present", "Hectic fever + rigors + toxaemia", "Absent (unless secondary infection)"],
    ],
    col_widths=[3*cm, 5*cm, 5*cm, 5*cm-0.3*cm],
    header_bg=DARK_TEAL, alt1=MINT, alt2=HexColor("#FFFFFF"),
))

story.append(sp(10))
story += [
    HRFlowable(width="100%", thickness=2, color=SIDEBAR),
    sp(4),
    Paragraph("End of Notes – Good Luck in Your Exam!", S("EndNote",
        fontSize=12, textColor=SIDEBAR, fontName="Helvetica-Bold",
        alignment=1, leading=16)),
    sp(4),
    Paragraph("Source: A Concise Textbook of Surgery, Chapters 7, 8, 12 &amp; 13", S("EndSrc",
        fontSize=9, textColor=MID_GREY, fontName="Helvetica-Oblique", alignment=1)),
]

# ── BUILD PDF ──────────────────────────────────────────────────────────────
out_path = "/home/daytona/workspace/infectious-diseases-pdf/Infectious_Diseases_Notes.pdf"
doc = SimpleDocTemplate(
    out_path,
    pagesize=A4,
    leftMargin=1.8*cm,
    rightMargin=1.8*cm,
    topMargin=1.6*cm,
    bottomMargin=1.8*cm,
    title="Infectious Diseases – Exam Notes",
    author="A Concise Textbook of Surgery",
)
doc.build(story, onFirstPage=on_first_page, onLaterPages=on_later_pages)
print(f"PDF created: {out_path}")

cd /home/daytona/workspace/infectious-diseases-pdf && python3 generate_pdf.py 2>…

ls -lh /home/daytona/workspace/infectious-diseases-pdf/Infectious_Diseases_Notes…

python3 -c " from pypdf import PdfReader r = PdfReader('/home/daytona/workspace/…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspac…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspac…

mkdir -p /home/daytona/workspace/ulcers-pdf && ls /home/daytona/workspace/

~/ulcers-pdf/generate_ulcers_pdf.py

from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.lib import colors
from reportlab.platypus import (
    SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle,
    HRFlowable, PageBreak, KeepTogether
)
from reportlab.lib.colors import HexColor

# ── Colour Palette ─────────────────────────────────────────────────────────
YELLOW   = HexColor("#FFF176")
CYAN     = HexColor("#B2EBF2")
GREEN    = HexColor("#DCEDC8")
PINK     = HexColor("#FCE4EC")
ORANGE   = HexColor("#FFE0B2")
LAVENDER = HexColor("#EDE7F6")
MINT     = HexColor("#E0F2F1")
RED_HL   = HexColor("#FFCDD2")
PEACH    = HexColor("#FFF3E0")

DARK_BLUE   = HexColor("#0D47A1")
DARK_GREEN  = HexColor("#1B5E20")
DARK_RED    = HexColor("#B71C1C")
DARK_PURPLE = HexColor("#4A148C")
DARK_TEAL   = HexColor("#004D40")
DARK_ORANGE = HexColor("#E65100")
DARK_GREY   = HexColor("#212121")
MID_GREY    = HexColor("#424242")
SIDEBAR     = HexColor("#1565C0")

W, H = A4

# ── Page template ──────────────────────────────────────────────────────────
def on_page(canvas, doc):
    canvas.saveState()
    canvas.setFillColor(HexColor("#FFFFFF"))
    canvas.rect(0, 0, W, H, fill=1, stroke=0)
    # left strip
    canvas.setFillColor(SIDEBAR)
    canvas.rect(0, 0, 0.5*cm, H, fill=1, stroke=0)
    # right strip
    canvas.setFillColor(SIDEBAR)
    canvas.rect(W - 0.5*cm, 0, 0.5*cm, H, fill=1, stroke=0)
    # footer
    canvas.setFillColor(HexColor("#E3F2FD"))
    canvas.rect(0, 0, W, 1.1*cm, fill=1, stroke=0)
    canvas.setFont("Helvetica-Bold", 8)
    canvas.setFillColor(SIDEBAR)
    canvas.drawCentredString(W/2, 0.4*cm,
        "Ulcers, Sinus & Fistula  |  A Concise Textbook of Surgery  |  Chapter 11")
    canvas.setFont("Helvetica", 8)
    canvas.drawRightString(W - 1*cm, 0.4*cm, f"Page {doc.page}")
    canvas.restoreState()

# ── Style helpers ──────────────────────────────────────────────────────────
base = getSampleStyleSheet()

def S(name, **kw):
    parent = kw.pop("parent", "Normal")
    return ParagraphStyle(name, parent=base[parent], **kw)

TITLE_S  = S("T", fontSize=26, textColor=colors.white, leading=32, alignment=1,
              fontName="Helvetica-Bold", backColor=SIDEBAR, borderPadding=(10,16,10,16))
SUB_T    = S("ST", fontSize=12, textColor=DARK_BLUE, leading=16, alignment=1,
              fontName="Helvetica-Bold", backColor=HexColor("#E3F2FD"), borderPadding=(6,10,6,10))
INFO_T   = S("IT", fontSize=10, textColor=MID_GREY, leading=14, alignment=1,
              fontName="Helvetica")

CH_S     = S("CH", fontSize=15, textColor=colors.white, leading=20, fontName="Helvetica-Bold",
              backColor=DARK_BLUE, borderPadding=(6,10,6,10), spaceAfter=6)
SEC_S    = S("SEC", fontSize=12, textColor=DARK_BLUE, leading=16, fontName="Helvetica-Bold",
              backColor=CYAN, borderPadding=(4,8,4,8), spaceAfter=4, spaceBefore=8)
SUB_S    = S("SUB", fontSize=11, textColor=DARK_GREEN, leading=15, fontName="Helvetica-Bold",
              backColor=GREEN, borderPadding=(3,6,3,6), spaceAfter=3, spaceBefore=6)
SUB2_S   = S("SUB2", fontSize=10.5, textColor=DARK_PURPLE, leading=14, fontName="Helvetica-Bold",
              backColor=LAVENDER, borderPadding=(2,5,2,5), spaceAfter=2, spaceBefore=5)

BODY  = S("BO", fontSize=9.5, leading=14, textColor=DARK_GREY, fontName="Helvetica",
           spaceAfter=3, spaceBefore=1, leftIndent=8)
BULL  = S("BU", fontSize=9.5, leading=13, textColor=MID_GREY, fontName="Helvetica",
           leftIndent=20, spaceAfter=2, bulletIndent=10)
DEF_S = S("DEF", fontSize=9.5, leading=13, fontName="Helvetica-BoldOblique",
           textColor=HexColor("#1A237E"), backColor=HexColor("#E8EAF6"),
           borderPadding=(4,8,4,8), spaceAfter=4, leftIndent=8)

N_Y = S("NY", fontSize=9.5, leading=13, fontName="Helvetica-Bold",
         textColor=HexColor("#5D4037"), backColor=YELLOW,
         borderPadding=(3,6,3,6), leftIndent=8, spaceAfter=3)
N_O = S("NO", fontSize=9.5, leading=13, fontName="Helvetica-Bold",
         textColor=HexColor("#BF360C"), backColor=ORANGE,
         borderPadding=(3,6,3,6), leftIndent=8, spaceAfter=3)
N_P = S("NP", fontSize=9.5, leading=13, fontName="Helvetica-Bold",
         textColor=DARK_RED, backColor=PINK,
         borderPadding=(3,6,3,6), leftIndent=8, spaceAfter=3)
N_M = S("NM", fontSize=9.5, leading=13, fontName="Helvetica-Bold",
         textColor=DARK_TEAL, backColor=MINT,
         borderPadding=(3,6,3,6), leftIndent=8, spaceAfter=3)
N_L = S("NL", fontSize=9.5, leading=13, fontName="Helvetica-Bold",
         textColor=DARK_PURPLE, backColor=LAVENDER,
         borderPadding=(3,6,3,6), leftIndent=8, spaceAfter=3)

def sp(n=4):  return Spacer(1, n)
def hr(c=HexColor("#BBDEFB"), t=1.2): return HRFlowable(width="100%", thickness=t, color=c, spaceAfter=4, spaceBefore=4)

def chap(t):   return [sp(10), Paragraph(t, CH_S), hr(DARK_BLUE, 2)]
def sec(t):    return [sp(6),  Paragraph(t, SEC_S)]
def sub(t):    return [sp(4),  Paragraph(t, SUB_S)]
def sub2(t):   return [sp(3),  Paragraph(t, SUB2_S)]
def body(t):   return Paragraph(t, BODY)
def bl(t):     return Paragraph(f"•  {t}", BULL)
def defn(t):   return Paragraph(f"<b>Definition:</b> {t}", DEF_S)
def ny(t):     return Paragraph(f"&#9733;  {t}", N_Y)   # yellow
def no(t):     return Paragraph(f"&#9998;  {t}", N_O)   # orange important
def np_(t):    return Paragraph(f"&#9888;  {t}", N_P)   # pink warning
def nm(t):     return Paragraph(f"&#9679;  {t}", N_M)   # mint tip
def nl(t):     return Paragraph(f"&#9830;  {t}", N_L)   # lavender

def tbl(headers, rows, cw=None, hbg=DARK_BLUE, a1=HexColor("#E3F2FD"), a2=colors.white):
    data = [headers] + rows
    t = Table(data, colWidths=cw, repeatRows=1)
    t.setStyle(TableStyle([
        ("BACKGROUND",    (0,0), (-1,0), hbg),
        ("TEXTCOLOR",     (0,0), (-1,0), colors.white),
        ("FONTNAME",      (0,0), (-1,0), "Helvetica-Bold"),
        ("FONTSIZE",      (0,0), (-1,0), 9),
        ("ALIGN",         (0,0), (-1,0), "CENTER"),
        ("VALIGN",        (0,0), (-1,-1), "MIDDLE"),
        ("FONTSIZE",      (0,1), (-1,-1), 8.5),
        ("FONTNAME",      (0,1), (-1,-1), "Helvetica"),
        ("ROWBACKGROUNDS",(0,1), (-1,-1), [a1, a2]),
        ("GRID",          (0,0), (-1,-1), 0.5, HexColor("#90CAF9")),
        ("TOPPADDING",    (0,0), (-1,-1), 4),
        ("BOTTOMPADDING", (0,0), (-1,-1), 4),
        ("LEFTPADDING",   (0,0), (-1,-1), 5),
        ("RIGHTPADDING",  (0,0), (-1,-1), 5),
    ]))
    return t

# ══════════════════════════════════════════════════════════════════════════
story = []

# ── COVER ──────────────────────────────────────────────────────────────────
story += [
    sp(60),
    Paragraph("ULCERS, SINUS &amp; FISTULA", TITLE_S),
    sp(12),
    Paragraph("Exam-Oriented Study Notes", SUB_T),
    sp(20),
    Paragraph("Source: A Concise Textbook of Surgery", INFO_T),
    sp(4),
    Paragraph("Chapter 11  |  Pages 156–168", INFO_T),
    sp(40),
    HRFlowable(width="70%", thickness=3, color=SIDEBAR, hAlign="CENTER"),
    sp(10),
    Paragraph("Prepared for Examination Success", INFO_T),
    PageBreak(),
]

# ════════════════════════════════════════════════════════════════
# DEFINITION & EXAMINATION
# ════════════════════════════════════════════════════════════════
story += chap("CHAPTER 11: ULCERS, SINUS AND FISTULA")

story += sec("DEFINITION OF ULCER")
story.append(defn("A <b>break in the continuity of the covering epithelium</b> – skin or mucous membrane. May follow: (i) Molecular death of surface epithelium OR (ii) Traumatic removal of epithelium."))

story += sec("EXAMINATION OF AN ULCER – THREE PARTS")
story.append(tbl(
    ["Part", "Description", "Key Point"],
    [
        ["Edge / Margin", "Takes a characteristic shape depending on type of ulcer", "Most diagnostic part of the ulcer"],
        ["Floor", "The exposed surface within the ulcer", "Tells us health of ulcer"],
        ["Base", "The part on which the ulcer rests", "Better FELT than seen"],
    ],
    cw=[3.5*cm, 7*cm, 5.5*cm],
))
story.append(sp(4))

# EDGES
story += sec("TYPES OF EDGES – HIGH YIELD")
story.append(tbl(
    ["Edge Type", "Ulcer / Condition", "Features"],
    [
        ["Undermined edge", "TUBERCULOSIS", "Disease spreads in subcutaneous tissue faster than skin; overhanging skin = thin, friable, reddish-blue, unhealthy"],
        ["Punched-out edge", "Gummatous ulcer / Deep trophic ulcer", "Edge drops at right angle as if cut by a punch; disease does NOT spread to surrounding tissue"],
        ["Sloping edge", "Healing traumatic or VENOUS ulcer", "Reddish-purple; new healthy epithelium; seen in every HEALING ulcer"],
        ["Raised & pearly-white beaded", "RODENT ULCER (BCC)", "Develops in invasive cellular disease; necrotic at centre"],
        ["Rolled-out (Everted) edge", "SCC / Ulcerated adenocarcinoma", "Fast-growing cellular disease; growing edge heaps up and spills over normal skin"],
    ],
    cw=[4*cm, 4.5*cm, 7.5*cm],
    hbg=DARK_TEAL, a1=MINT, a2=colors.white,
))
story.append(sp(3))
story += [
    ny("<b>Spreading ulcer</b> – edge is inflamed and oedematous | <b>Healing ulcer</b> – blue zone (thin epithelium) + white zone (fibrosis) from centre outward"),
    no("<b>Marked induration of edge</b> = characteristic of CARCINOMA | Moderate induration expected in any chronic ulcer"),
]

# FLOOR & BASE
story += sec("FLOOR AND BASE")
story.append(tbl(
    ["Floor Appearance", "Interpretation"],
    [
        ["Red granulation tissue", "Healthy, healing ulcer"],
        ["Pale and smooth granulation tissue", "Slowly healing ulcer"],
        ["WASH-LEATHER SLOUGH (wet chamois leather)", "PATHOGNOMONIC of GUMMATOUS (SYPHILITIC) ULCER"],
        ["Bone visible", "Trophic ulcer (penetrates to bone)"],
        ["Black mass", "Malignant melanoma"],
    ],
    cw=[7*cm, 9*cm],
    hbg=DARK_ORANGE, a1=ORANGE, a2=colors.white,
))
story += [sp(3), np_("<b>Marked induration (hardness) of BASE</b> = important feature of SQUAMOUS CELL CARCINOMA and HUNTERIAN CHANCRE (primary syphilis)")]

# CLASSIFICATION
story += sec("CLASSIFICATION OF ULCERS")
story += sub("I. CLINICAL CLASSIFICATION")
story.append(tbl(
    ["Type", "Features"],
    [
        ["SPREADING", "Surrounding skin inflamed; floor covered with SLOUGH; NO granulation tissue"],
        ["HEALING", "Granulation tissue in floor; surrounding skin NOT inflamed; BLUISH edge (growing epithelium); slight serous discharge"],
        ["CALLOUS", "PALE granulation tissue; considerable induration at base, edge, surrounding skin; NO tendency to heal"],
    ],
    cw=[3.5*cm, 12.5*cm],
    hbg=DARK_PURPLE, a1=LAVENDER, a2=colors.white,
))
story.append(sp(4))

story += sub("II. PATHOLOGICAL CLASSIFICATION")
story += [
    ny("<b>A. Non-specific ulcers:</b> Traumatic | Arterial | Venous | Neurogenic | Infective | Tropical | Cryopathic | Martorell's | Bazin's | Diabetic | Miscellaneous"),
    nm("<b>B. Specific ulcers:</b> Tuberculosis | Syphilis | Soft sore (chancroid) | Actinomycosis | Meleney's ulcer"),
    no("<b>C. Malignant ulcers:</b> Epithelioma | Rodent ulcer | Malignant melanoma"),
]

story.append(PageBreak())

# ════════════════════════════════════════════════════════════════
# INDIVIDUAL ULCERS
# ════════════════════════════════════════════════════════════════
story += chap("INDIVIDUAL ULCERS IN DETAIL")

# 1. TRAUMATIC
story += sec("1. TRAUMATIC ULCER")
story += [
    bl("Occurs where skin is closely applied to bony prominences: <b>shin, malleoli, back of heel</b>"),
    bl("Also: plaster sores, dental ulcer of tongue from jagged tooth"),
    bl("Small, painful, circular ulcers"),
    bl("Heal quickly unless infected or ischaemic"),
    ny("<b>'Footballer's ulcer'</b> – shin; chronic staphylococcal infection in area of repetitive trauma"),
]

# 2. ARTERIAL
story += sec("2. ARTERIAL ULCER")
story += [
    body("<b>Causes:</b> Atherosclerosis (commonest) | Buerger's disease (men 20-40 yrs) | Raynaud's disease"),
    body("<b>Site:</b> Anterior and lateral leg, toes, dorsum of foot, heel (areas of trauma and pressure)"),
    sp(2),
]
story += [
    no("<b>Pain is the MAIN COMPLAINT</b>"),
    ny("Edge: <b>PUNCHED-OUT</b> | Destroys whole skin + deep fascia (unlike venous ulcer) | May expose TENDONS on floor"),
    np_("<b>Elevated above heart level</b> → NO healing + INCREASED PAIN (key differentiator from venous ulcer)"),
    bl("Buerger's disease: patches of DRY GANGRENE present alongside ulcer"),
    bl("<b>Investigation:</b> Arteriography to detect arterial disease"),
]

# 3. VENOUS
story += sec("3. VENOUS ULCER")
story += [
    no("<b>COMMONEST ulcer of the leg</b>"),
    body("<b>Basic cause:</b> Abnormal <b>venous hypertension</b> in lower third of leg, ankle and dorsum of foot"),
    body("<b>Also called:</b> Varicose ulcer | Post-thrombotic ulcer | Gravitational ulcer"),
    ny("Edge: <b>SLOPING</b> (if healing) | Site: Lower third of leg, MEDIAL side of ankle (gaiter area) | Elevated leg IMPROVES healing"),
]

# 4. NEUROGENIC
story += sec("4. NEUROGENIC ULCER")
story.append(defn("Repeated injury or pressure to an area that has <b>LOST appreciation of pain</b>."))
story += sub("Neurological conditions causing it:")
story += [
    bl("Diabetes | Alcoholic peripheral neuritis | <b>Tabes dorsalis</b> | Spina bifida"),
    bl("Leprosy | Peripheral nerve injury | Paraplegia | <b>Syringomyelia</b>"),
]
story += sub("Features")
story += [
    np_("<b>PAINLESS ulcers</b>"),
    ny("Ambulatory: heel and ball of foot | Non-ambulatory: buttock and back of heel"),
    no("<b>Pathogenesis:</b> Callosity → suppuration under callosity → pus escapes → central hole forms → burrows through muscles + tendons → reaches <b>BONE</b>"),
    nm("Also called <b>PERFORATING ULCER</b>"),
    bl("<b>Trophic ulcer</b> = impaired nutrition + inadequate blood supply + neurological deficit; includes BED SORES; <b>punched-out edge with slough in floor</b> (resembles gummatous ulcer)"),
]

# 5. TROPICAL
story += sec("5. TROPICAL ULCER")
story += [
    body("<b>Cause:</b> Infection by <b>Vincent's organisms</b> (<i>Bacteroides fusiformis</i>) in a small abrasion; also: malnutrition, anaemia, avitaminosis, rheumatoid arthritis"),
    body("<b>Pathogenesis:</b> Small abrasion/insect bite → papule + surrounding inflammation → acute lymphadenitis → pustules (2-3 days) → burst → ulcers with undermined + raised edges"),
]
story += [
    np_("<b>Most characteristic feature: CALLOUSNESS TOWARDS HEALING</b> – retains same size for months/years"),
    ny("Copious <b>serosanguineous discharge</b> with considerable pain = most important feature"),
    bl("Edge: slightly raised and undermined | May destroy surrounding tissue and spread widely"),
    bl("If it heals: parchment-like PIGMENTED SCAR"),
]

# 6. CRYOPATHIC
story += sec("6. CRYOPATHIC ULCERS")
story += sub2("(a) Chilblains (Pernosis)")
story += [
    bl("Intense cold + excessive vasoconstriction of skin arterioles"),
    bl("Red tender spot → pruritic swelling → blisters → burst → <b>SUPERFICIAL ulcers</b>"),
]
story += sub2("(b) Cold Injury / Frostbite")
story += [
    bl("Exposure to wet cold BELOW FREEZING POINT"),
    ny("Arteriolar spasm → blood stasis in capillaries → freezing of tissues → denaturation of intracellular proteins + destruction of enzyme systems → <b>GANGRENE of full thickness skin</b>"),
]

# 7. MARTORELL'S
story += sec("7. MARTORELL'S ULCER (Hypertensive Ulcer)")
story += [
    body("<b>First described:</b> Martorell, 1945 | <b>Patients:</b> Over 50 years; usually HYPERTENSIVE or ATHEROSCLEROTIC"),
    body("<b>Pathology:</b> Sudden obliteration of END ARTERIOLES of skin (already sparse from atherosclerosis)"),
]
story += [
    ny("Site: <b>back or outer side of CALF</b> – skin suddenly necroses and sloughs → punched-out ulcer extending to DEEP FASCIA"),
    no("<b>Appears suddenly; considerable pain</b> – may prevent sleep | May be <b>BILATERAL</b>"),
    nm("All peripheral foot pulses <b>USUALLY PRESENT</b> – important distinguishing feature"),
    np_("Long painful course; takes MONTHS to heal (ischaemic lesion)"),
]

# 8. BAZIN'S
story += sec("8. BAZIN'S ULCER (Erythrocyanoid Ulcer)")
story += [
    ny("Exclusive disease of <b>YOUNG WOMEN</b> | Thick ankles + abnormal subcutaneous fat + abnormally poor arterial supply to ankle skin"),
    body("<b>Pathology:</b> Fine perforating arteries (from posterior tibial + peroneal arteries) are abnormally small or absent → <b>LOW-GRADE ISCHAEMIA of ankle region</b>"),
]
story += [
    bl("Cold weather: ankle is BLUE, cold, often tender"),
    bl("Hot weather: chronic reactive hyperaemia → ankle becomes HOT, oedematous, swollen, painful"),
    ny("Palpation: <b>small, superficial, PAINFUL NODULES</b> → break down → <b>SMALL and MULTIPLE ulcers</b>"),
    bl("Much troubled by chilblains"),
    no("<b>Treatment:</b> Sympathectomy may be necessary (especially in cold climate)"),
]

# 9. DIABETIC
story += sec("9. DIABETIC ULCER")
story += sub("Aetiology")
story += [
    bl("Slight injury to glucose-laden tissue → chronic infection → ulcer"),
    bl("Ischaemia due to <b>diabetic atherosclerosis</b>"),
    bl("More prone to infection of glucose-laden tissue"),
    bl("<b>Diabetic polyneuropathy/peripheral neuritis</b> → ulcer formation"),
]
story += [
    ny("<b>Site:</b> Toes and feet (SOLE = commonest) | Leg | Any part of body"),
    no("<b>Nature:</b> DEEP and SPREADING"),
]
story += sub("Investigations")
story += [
    bl("Blood sugar (fasting and post-prandial)"),
    bl("Urine ketone bodies"),
    bl("Culture and sensitivity of discharge"),
    nm("<b>Doppler ultrasound</b> for arterial blood flow of lower limb"),
]
story += sub("Treatment")
story += [
    bl("Control diabetes"),
    bl("Antibiotics for infection"),
    bl("Excision + debridement + skin grafting when healthy granulation tissue forms"),
]

# 10. MISCELLANEOUS
story += sec("10. MISCELLANEOUS ULCERS")
story += [
    nl("Leg ulcers associated with: gross anaemia | polycythemia | leukaemia | systemic sclerosis | rheumatoid arthritis | ulcerative colitis | poliomyelitis | arteriovenous fistulae | acholuric jaundice | collagen disorders | chronic lymphoedema"),
    np_("<b>Cortisone ulcers:</b> Prolonged use of cortisone ointments on ankle lesions → large CALLOUS ulcers with NO inflammatory response; difficult to treat; may require excision + skin grafting"),
]

story.append(PageBreak())

# ════════════════════════════════════════════════════════════════
# SPECIFIC ULCERS
# ════════════════════════════════════════════════════════════════
story += chap("SPECIFIC ULCERS")

# TUBERCULOUS
story += sec("11. TUBERCULOUS ULCER")
story += [
    body("<b>Origin:</b> Usually from bursting of a cold abscess from: (i) matted tuberculous lymph nodes, (ii) TB of bone or joint, (iii) submucous lesions (intestinal TB, tongue TB)"),
    sp(3),
]
story.append(tbl(
    ["Feature", "Description"],
    [
        ["Shape", "Oval with IRREGULAR CRESCENTIC BORDER"],
        ["Number", "Often MULTIPLE"],
        ["EDGE", "Thin, reddish-blue and UNDERMINED (hallmark)"],
        ["Depth", "Usually SHALLOW"],
        ["Pain", "Slight pain"],
        ["Floor", "PALE granulation tissue with variable discharge"],
        ["Base", "SLIGHT INDURATION (chronicity); attached to underlying lesion (lymph nodes, bone, joint)"],
    ],
    cw=[4*cm, 12*cm],
    hbg=DARK_TEAL, a1=MINT, a2=colors.white,
))
story.append(sp(4))
story += sub("Lupus Vulgaris")
story += [
    body("Form of CUTANEOUS TUBERCULOSIS | Common on face and hand | Victims = children and young adults"),
    np_("<b>Peculiarity: HEALS AT CENTRE and REMAINS ACTIVE AT PERIPHERY</b> – spreads like a wolf. Hence 'lupus' (Latin: wolf)"),
    bl("Management: Antitubercular drugs | If healing incomplete: excision + skin grafting"),
    bl("Investigations: Chest X-ray | ESR | Examination of discharge | Biopsy if required"),
]

# SYPHILITIC
story += sec("12. SYPHILITIC ULCERS")
story.append(defn("Ulcers due to syphilis are seen in ALL THREE STAGES of the disease."))

story += sub2("Stage 1 – PRIMARY SYPHILIS: Hard Chancre (Hunterian Chancre)")
story += [
    body("Develops at site of entry of treponemes; ~3-4 weeks after exposure"),
    body("<b>Sites:</b> External genitalia (commonest); extragenital = lip, tongue, nipple, perianal region"),
    sp(2),
]
story.append(tbl(
    ["Feature", "Description"],
    [
        ["Number", "Usually SINGLE"],
        ["Pain", "PAINLESS (extragenital = may be slightly painful)"],
        ["Base", "Characteristic INDURATED base – feels like a BUTTON"],
        ["Shape", "Shallow, oval or round with raised hyperaemic margin"],
        ["Lymph nodes", "Enlarged, firm, discrete, PAINLESS"],
    ],
    cw=[4*cm, 12*cm],
    hbg=DARK_RED, a1=PINK, a2=colors.white,
))
story.append(sp(4))

story += sub2("Stage 2 – SECONDARY SYPHILIS: Three Lesion Types")
story += [
    ny("<b>1. Mucous patches:</b> White patches of sodden thickened epithelium"),
    no("<b>2. Snail-track ulcers:</b> Multiple small, round, superficial erosions coalescing → narrow, curved, shallow ulcers; commonly in the MOUTH"),
    nm("<b>3. Condyloma lata:</b> Fleshy wart-like growths at mucocutaneous junctions (angles of mouth, anus, vulva); moist surfaces TEEMED WITH TREPONEMES"),
    np_("Generalised PAINLESS lymphadenopathy; especially <b>epitrochlear + suboccipital</b> nodes – almost always enlarged = diagnostic to some extent"),
]

story += sub2("Stage 3 – TERTIARY SYPHILIS: Gummatous Ulcer")
story += [
    body("<b>Gumma</b> = syphilitic hypersensitivity reaction: granulation tissue + central necrosis → sloughing → gummatous ulcer"),
]
story.append(tbl(
    ["Feature", "Description"],
    [
        ["Edge", "PUNCHED-OUT, indolent"],
        ["Pain", "PAINLESS"],
        ["Floor", "Yellowish-grey tissue = WASH-LEATHER SLOUGH (pathognomonic)"],
        ["Scar", "Silvery 'TISSUE PAPER' SCAR on healing"],
        ["Serology", "WR, Kahn and VDRL tests POSITIVE"],
        ["Lymph nodes", "NOT enlarged (unless secondarily infected)"],
    ],
    cw=[4*cm, 12*cm],
    hbg=DARK_PURPLE, a1=LAVENDER, a2=colors.white,
))
story.append(sp(3))
story += [
    ny("<b>Characteristic sites of gummatous ulcer:</b> Over subcutaneous bones (tibia, sternum, ulna, skull) | Scrotum (anterior surface) | Tongue (occasionally)"),
]

# SOFT CHANCRE
story += sec("13. SOFT CHANCRE / CHANCROID (DUCREY'S ULCER)")
story += [
    defn("Caused by gram-negative <b><i>Haemophillus ducreyi</i></b>. Contagious disease."),
    body("<b>Onset:</b> 3-5 days after exposure → multiple acute sores on external genitalia → pustular → <b>soft sores</b>"),
]
story.append(tbl(
    ["Feature", "Description"],
    [
        ["Number", "MULTIPLE"],
        ["Pain", "PAINFUL"],
        ["Base", "SOFT"],
        ["Edges", "UNDERMINED"],
        ["Bleeding", "READILY BLEEDS"],
        ["Lymph nodes", "Enlarged, tender, ACUTE LYMPHADENITIS; may form 'BUBO'"],
    ],
    cw=[4*cm, 12*cm],
    hbg=DARK_RED, a1=PINK, a2=colors.white,
))
story += [
    sp(3),
    np_("<b>NEVER INCISE buboes</b> – chronic sinuses will form. <b>ASPIRATE</b> instead."),
    no("<b>Treatment:</b> Sulphonamide OR cotrimoxazole 2 tablets BD × 7-10 days"),
]

# ACTINOMYCOSIS ULCER
story += sec("14. ACTINOMYCOSIS ULCER")
story += [
    bl("Causes <b>multiple ulcers</b>; area first becomes indurated → nodules appear → soften → ulcerate in various places"),
    ny("Surrounding skin: <b>BLUISH in colour</b> | Multiple ulcers in indurated area with bluish skin → suspect actinomycosis"),
    nm("<b>Diagnosis:</b> Pus collected → <b>'Sulphur granules'</b> present → microscopy: gram-positive mycelia (<i>Actinomyces israelii</i>); peripheral filaments RADIATE from central granule = 'RAY FUNGUS'"),
    nl("<b>Sites:</b> (i) Facio-cervical (commonest) → (ii) Thorax → (iii) Right iliac fossa → (iv) Liver"),
]

# MELENEY'S
story += sec("15. MELENEY'S ULCER")
story += [
    body("<b>Occurs in:</b> Postoperative wounds after (i) perforated viscus operations OR (ii) drainage of empyema thoracis; rarely on dorsum of hand"),
    ny("<b>Cause:</b> SYMBIOTIC action of <b>microaerophilic non-haemolytic streptococci</b> + <b>haemolytic Staphylococcus aureus</b>"),
]
story += [
    bl("UNDERMINED ulcer + lot of granulation tissue in floor"),
    no("Surrounded by <b>deep purple zone</b> → outer zone of <b>erythema</b>"),
    np_("PAINFUL + TOXAEMIC | General condition deteriorates without treatment"),
]

# BAIRNSDALE
story += sec("16. BAIRNSDALE ULCER")
story += [
    ny("<b>Cause:</b> Acid-fast bacillus – <i>Mycobacterium ulcerans</i> | Deep severe form = <b>'BURULI ULCER'</b> (extensive dermal necrosis)"),
    bl("<b>Diagnosis:</b> Discharge examination shows ACID-FAST BACILLI"),
    bl("<b>Treatment:</b> Antitubercular drugs (usually resolve ulcer); skin grafting may be necessary"),
]

story.append(PageBreak())

# ════════════════════════════════════════════════════════════════
# COMPARISON TABLES
# ════════════════════════════════════════════════════════════════
story += chap("HIGH-YIELD COMPARISON TABLES")

story += sec("Arterial vs Venous Ulcer")
story.append(tbl(
    ["Feature", "Arterial Ulcer", "Venous Ulcer"],
    [
        ["Commonest cause", "Atherosclerosis, Buerger's disease", "Venous hypertension, varicose veins"],
        ["Site", "Anterior/lateral leg, toes, dorsum, heel", "Lower 1/3 leg, MEDIAL SIDE OF ANKLE"],
        ["Pain", "SEVERE", "Mild"],
        ["Edge", "PUNCHED-OUT", "SLOPING (if healing)"],
        ["Depth", "Destroys skin + deep fascia; exposes tendons", "Relatively superficial"],
        ["Elevated leg", "WORSENS – more pain, no healing", "IMPROVES"],
        ["Pulses", "ABSENT", "Present"],
    ],
    cw=[4*cm, 6*cm, 6*cm],
    hbg=DARK_BLUE, a1=CYAN, a2=colors.white,
))
story.append(sp(8))

story += sec("Hard Chancre vs Soft Chancre (EXAM FAVOURITE)")
story.append(tbl(
    ["Feature", "Hard Chancre (Syphilis)", "Soft Chancre (Chancroid)"],
    [
        ["Organism", "Treponema pallidum", "Haemophillus ducreyi"],
        ["Number", "Usually SINGLE", "MULTIPLE"],
        ["Pain", "PAINLESS", "PAINFUL"],
        ["Base", "HARD – feels like a button", "SOFT"],
        ["Edges", "Raised, hyperaemic", "UNDERMINED"],
        ["Bleeding", "Does NOT readily bleed", "READILY BLEEDS"],
        ["Lymph nodes", "Firm, discrete, PAINLESS", "Enlarged, tender, LYMPHADENITIS + BUBO"],
    ],
    cw=[4*cm, 6*cm, 6*cm],
    hbg=DARK_RED, a1=PINK, a2=colors.white,
))
story.append(sp(8))

story += sec("Edge Types – Quick Recall")
story.append(tbl(
    ["Edge", "Ulcer"],
    [
        ["UNDERMINED", "TUBERCULOSIS"],
        ["PUNCHED-OUT", "Gummatous (Syphilis) / Trophic (deep)"],
        ["SLOPING", "Healing / Venous ulcer"],
        ["RAISED PEARLY-WHITE BEADED", "Rodent ulcer (BCC)"],
        ["ROLLED-OUT (EVERTED)", "SCC / Adenocarcinoma"],
    ],
    cw=[7*cm, 9*cm],
    hbg=DARK_ORANGE, a1=ORANGE, a2=colors.white,
))

story.append(PageBreak())

# ════════════════════════════════════════════════════════════════
# MANAGEMENT
# ════════════════════════════════════════════════════════════════
story += chap("PRINCIPLES OF MANAGEMENT OF ULCERS")

story.append(tbl(
    ["Step", "Action"],
    [
        ["1", "Determine AETIOLOGY"],
        ["2", "Accurate assessment of the ulcer"],
        ["3", "Identify and CORRECT morbid factors: anaemia, diabetes, infection"],
        ["4", "Treat UNDERLYING CAUSES"],
        ["5", "Drainage and DESLOUGHING of the ulcer"],
        ["6", "AVOID ADHERENT DRESSINGS"],
    ],
    cw=[1.5*cm, 14.5*cm],
    hbg=DARK_BLUE, a1=CYAN, a2=colors.white,
))
story.append(sp(4))
story += [
    np_("<b>Antiseptic solutions:</b> IMPAIR capillary circulation + TOXIC to granulation tissue – should be DISCARDED"),
    nm("<b>Clean with NORMAL SALINE</b> – safer for granulation tissue"),
    no("Gauze packs: become ADHERENT to granulation tissue, avulse superficial layer, DELAY HEALING"),
    ny("<b>Ideal dressing:</b> Soft | Absorbent | NON-ADHERENT | Non-allergic"),
]
story += sub("Modern Dressings")
story.append(tbl(
    ["Dressing", "Type / Brand", "Properties / Use"],
    [
        ["Hydrocelluloid gel", "Granuflex, Hydrogel", "Polyurethane base; fills wound on contact with exudate; good for leg ulcers and pressure sores; effective barrier against microorganisms"],
        ["Alginates", "Kalstostat, Sorbsan", "Absorbent fibres (sodium + calcium salt of algenic acid); form gel promoting healing"],
        ["Microporous polyurethane films", "Liofoam", "For SHALLOW lesions; permeable to gases/water vapour; IMPERMEABLE to microorganisms; suitable for minor burns, skin graft donor sites, postoperative wounds; NOT for established infection or excess exudate"],
    ],
    cw=[3.5*cm, 3.5*cm, 9*cm],
    hbg=DARK_TEAL, a1=MINT, a2=colors.white,
))

story.append(PageBreak())

# ════════════════════════════════════════════════════════════════
# SINUS AND FISTULA
# ════════════════════════════════════════════════════════════════
story += chap("SINUS AND FISTULA")

story += sec("DEFINITIONS")
story.append(tbl(
    ["Term", "Definition"],
    [
        ["SINUS", "A BLIND TRACK leading from the surface down to the tissues; may have a cavity connected to the surface; lined by granulation tissue (may be epithelialized)"],
        ["FISTULA", "A COMMUNICATING TRACK between two epithelial surfaces: (i) hollow viscus to skin = EXTERNAL fistula OR (ii) two hollow viscera = INTERNAL fistula; also = abnormal AV communication"],
    ],
    cw=[3*cm, 13*cm],
    hbg=DARK_BLUE, a1=CYAN, a2=colors.white,
))
story.append(sp(4))

story += sec("TYPES")
story.append(tbl(
    ["Type", "Examples"],
    [
        ["CONGENITAL", "Branchial fistula | Tracheo-oesophageal fistula | AV fistula | Preauricular sinus"],
        ["ACQUIRED", "Perianal fistula | Acquired AV fistula (trauma/dialysis) | Thyroglossal fistula | Pilonidal sinus"],
    ],
    cw=[3.5*cm, 12.5*cm],
    hbg=DARK_TEAL, a1=MINT, a2=colors.white,
))
story.append(sp(4))

story += sec("CAUSES OF PERSISTENCE")
story += sub("Causes of Persistence of a SINUS")
story.append(tbl(
    ["No.", "Cause"],
    [
        ["1", "Presence of FOREIGN BODY or NECROTIC TISSUE in the depth (e.g. sequestrum, suture material)"],
        ["2", "Absence of REST"],
        ["3", "Non-dependent or INADEQUATE DRAINAGE of an abscess"],
        ["4", "Specific chronic infection (TUBERCULOSIS, ACTINOMYCOSIS)"],
        ["5", "Track becomes EPITHELIALIZED"],
        ["6", "Dense FIBROSIS around wall preventing collapse (e.g. chronic empyema)"],
        ["7", "Presence of MALIGNANT DISEASE"],
    ],
    cw=[1.5*cm, 14.5*cm],
    hbg=DARK_ORANGE, a1=ORANGE, a2=colors.white,
))
story.append(sp(4))

story += sub("Causes of Persistence of a FISTULA")
story += [
    no("Once a true fistula is formed, it <b>SELDOM HEALS spontaneously</b>"),
    bl("IRRITANT DISCHARGES (urine, faeces, bile) through the fistula prevent healing"),
    bl("OBSTRUCTION OF LUMEN DISTAL to fistula = main cause"),
    nm("<b>'If the natural passage is made patent, all abnormal offshoots heal spontaneously'</b>"),
]

story += sec("EXAMINATION OF SINUS / FISTULA")
story += sub("Probe Examination informs about:")
story += [
    bl("Direction and DEPTH of sinus"),
    bl("Presence of FOREIGN BODY (e.g. sequestrum = movable at depth)"),
    bl("Whether fistula communicates with a HOLLOW VISCUS"),
    bl("Whether FRESH DISCHARGE comes out on withdrawal of probe"),
]
story += sub("Special Investigations")
story += [
    bl("<b>Examination of discharge</b>: macroscopic | physical | chemical | microscopic (sulphur granules for actinomycosis) | bacteriological"),
    bl("<b>Straight X-ray</b>: sequestrum, osteomyelitic changes, opaque foreign body"),
    ny("<b>Sinogram/Fistulogram</b> (radio-opaque fluid – lipiodol or Hypaque): shows depth + delineates course of sinus/fistula"),
]

story += sec("TYPES OF PATHOLOGICAL SINUSES")
story += sub("Congenital Sinuses")
story.append(tbl(
    ["Sinus", "Origin", "Key Point"],
    [
        ["Umbilical sinus", "Persistence of umbilical end of VITELLINE DUCT (connects foetal midgut to yolk sac)", "Treatment: EXCISION | Delineate with sinogram"],
        ["Urachal sinus", "Persistence of umbilical end of URACHUS (connects developing bladder to umbilicus)", "Chronic drainage from umbilicus; if complete: URINE LEAK; often infected; Treatment: TOTAL EXCISION"],
        ["Preauricular sinus", "Congenital; unilateral or bilateral", "Usually asymptomatic; if infected: antibiotics + drainage then excision; excision difficult (proximity to FACIAL NERVE); uncomplicated: leave alone"],
    ],
    cw=[3.5*cm, 5.5*cm, 7*cm],
    hbg=DARK_TEAL, a1=MINT, a2=colors.white,
))
story.append(sp(4))

story += sub("Acquired Sinuses")
story.append(tbl(
    ["Sinus", "Cause / Key Features"],
    [
        ["PILONIDAL SINUS", "Natal cleft | Caused by shed loose hair shafts migrating to natal cleft during walking; forced deep by gluteal contractions | Initially asymptomatic → blockage + infection → painful swelling → discharge → sinus tracks | Treatment: COMPLETE EXCISION of sinus + all ramifications | Recurrence = main problem"],
        ["POST-SURGICAL SINUS", "Non-absorbable SUTURE MATERIAL acting as focus of infection | More common in contaminated wounds | Treatment: REMOVE THE SUTURE"],
        ["HYDROADENITIS SUPPURATIVA", "Abnormality of APOCRINE SWEAT GLANDS (axillae, groins, perineum, around nipples) | Recurrent abscesses → discharge → chronic sinuses | Treatment: tetracycline + RADICAL SURGICAL EXCISION if condition persists"],
    ],
    cw=[4*cm, 12*cm],
    hbg=DARK_PURPLE, a1=LAVENDER, a2=colors.white,
))

story.append(PageBreak())

# ════════════════════════════════════════════════════════════════
# RAPID REVISION
# ════════════════════════════════════════════════════════════════
story += chap("RAPID REVISION – HIGH-YIELD EXAM POINTS")
story.append(tbl(
    ["High-Yield Fact", "Answer"],
    [
        ["Commonest ulcer of the leg", "VENOUS ULCER"],
        ["Edge pathognomonic of TB ulcer", "UNDERMINED EDGE"],
        ["Edge pathognomonic of SCC", "ROLLED-OUT (EVERTED) EDGE"],
        ["Floor pathognomonic of gummatous ulcer", "WASH-LEATHER SLOUGH"],
        ["Scar left by healed gummatous ulcer", "Silvery 'TISSUE PAPER' SCAR"],
        ["Neurogenic ulcer is also called", "PERFORATING ULCER"],
        ["Tropical ulcer organism", "Bacteroides fusiformis (Vincent's organisms)"],
        ["Meleney's ulcer organisms", "Microaerophilic non-haemolytic streptococci + haemolytic Staph. aureus"],
        ["Chancroid organism", "Haemophillus ducreyi"],
        ["Hard chancre base feels like", "A BUTTON (indurated)"],
        ["Lupus vulgaris characteristic", "Heals at CENTRE, active at PERIPHERY (like a wolf)"],
        ["Bairnsdale ulcer severe form", "BURULI ULCER (Mycobacterium ulcerans)"],
        ["Main cause of persistence of fistula", "Obstruction DISTAL to fistula"],
        ["Dressing fluid safe for ulcers", "NORMAL SALINE (not antiseptics)"],
        ["Pilonidal sinus location", "NATAL CLEFT"],
        ["Martorell's ulcer special finding", "Peripheral foot pulses PRESENT despite ischaemic ulcer"],
        ["Bazin's ulcer exclusive in", "YOUNG WOMEN (erythrocyanosis frigida)"],
        ["Actinomycosis ulcer skin colour", "BLUISH surrounding skin"],
        ["NEVER incise this (soft sore)", "BUBO (aspirate instead)"],
        ["Ulcer that heals with pigmented parchment scar", "TROPICAL ULCER"],
    ],
    cw=[9*cm, 7*cm],
    hbg=DARK_BLUE, a1=HexColor("#E3F2FD"), a2=colors.white,
))
story.append(sp(10))
story += [
    hr(SIDEBAR, 2),
    sp(4),
    Paragraph("End of Notes – Good Luck in Your Exam!", S("EN",
        fontSize=12, textColor=SIDEBAR, fontName="Helvetica-Bold", alignment=1, leading=16)),
    sp(4),
    Paragraph("Source: A Concise Textbook of Surgery, Chapter 11 (pp. 156–168)", S("ES",
        fontSize=9, textColor=MID_GREY, fontName="Helvetica-Oblique", alignment=1)),
]

# ── BUILD ──────────────────────────────────────────────────────────────────
out = "/home/daytona/workspace/ulcers-pdf/Ulcers_Sinus_Fistula_Notes.pdf"
doc = SimpleDocTemplate(
    out,
    pagesize=A4,
    leftMargin=1.8*cm, rightMargin=1.8*cm,
    topMargin=1.6*cm, bottomMargin=1.8*cm,
    title="Ulcers, Sinus & Fistula – Exam Notes",
    author="A Concise Textbook of Surgery",
)
doc.build(story, onFirstPage=on_page, onLaterPages=on_page)
print(f"PDF created: {out}")

cd /home/daytona/workspace/ulcers-pdf && python3 generate_ulcers_pdf.py 2>&1

python3 -c " from pypdf import PdfReader r = PdfReader('/home/daytona/workspace/…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspace…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspace…

python3 << 'EOF' from pypdf import PdfReader pdf_path = '/home/daytona/workspace…

.../blood-vessels-nerves-notes/DISEASES_OF_BLOOD_VESSELS_AND_NERVES.md

# DISEASES OF BLOOD VESSELS AND PERIPHERAL NERVES
### Exam Notes — A Concise Textbook of Surgery, Chapters 15–18

---

## CHAPTER 15: DISEASES OF ARTERIES

---

### ARTERIAL OCCLUSION

**Definition:** Stenosis or occlusion of arteries — mainly caused by atherosclerosis, emboli, or trauma.

**Effects by site:**
| Site | Effect |
|------|--------|
| Lower limb | Intermittent claudication → rest pain → gangrene |
| Heart | Angina pectoris → myocardial infarction |
| Brain | Transient ischaemic attacks → hemiplegia |
| Kidney | Hypertension |
| Intestine | Abdominal pain → infarction |

**Two types:** Chronic arterial occlusion | Acute arterial occlusion

---

### CHRONIC ARTERIAL OCCLUSION

#### Aetiology

**1. Atheroma** — by far the main cause

**Type I:** Yellow plaques in tunica intima — foam cells accumulate → fatty streaks → weakens wall → aneurysm (does NOT narrow lumen much)

**Type II (Atherosclerosis):** Fatty material + fibrosis — central mass of cholesterol + esters (porridge-like, yellow) surrounded by dense fibrous tissue (pearly white appearance) → luminal narrowing → thrombosis → calcification (visible on X-ray)

- β-lipoprotein (includes cholesterol) is the main culprit
- Unsaturated fat (vegetable) LOWERS blood cholesterol
- Oestrogens LOWER blood cholesterol → explains lower incidence in females

**2. Traumatic** — fractures, missile injury → thrombosis + narrowing

**3. Syphilis** — endarteritis obliterans → intimal thickening (thoracic aorta mainly)

**4. Diabetes** — atherosclerosis accelerated; peripheral arteries affected → gangrene

**5. Buerger's disease** — discussed separately

---

#### Clinical Features (Chronic Arterial Occlusion — Lower Limb)

**Stages of ischaemia:**
1. Intermittent claudication — calf pain on walking, relieved by rest
2. Rest pain — severe, worse at night, relieved by hanging leg down
3. Trophic changes — loss of hair, brittle nails, dry scaly skin
4. Tissue death — ulceration → gangrene

**Physical signs:**
- Absent/reduced peripheral pulses
- Skin: cold, pale on elevation, red on dependence (reactive hyperaemia)
- Buerger's test: limb becomes pale on elevation → flushing when dependent
- Capillary refilling time prolonged
- Bruits over stenosed vessels

---

#### Investigations

| Investigation | Purpose |
|---------------|---------|
| Doppler ultrasound (ABI) | First-line; Ankle-brachial index <0.9 = ischaemia |
| Duplex scanning | Shows anatomy + flow |
| Arteriography (gold standard) | Size, course, constrictions, collaterals ("run off") — uses Hypaque 45 (Sodium Diatrizoate) |
| Seldinger technique | Retrograde percutaneous catheterization via femoral/brachial artery |
| Oscillometry | Detects pulsation levels; sudden decrease = embolism level |
| Vasospasm test | Nerve block with local anaesthetic; measure Brown's vasomotor index |
| 99Tc isotope scan | Arterial imaging with gamma camera |

> ★ **Brown's vasomotor index** = (Rise skin temp − Rise mouth temp) / Rise mouth temp → sympathectomy only if index ≥ 3.5

---

#### Treatment

**Conservative:**
- Stop smoking (absolutely essential)
- Control diabetes, hypertension, hyperlipidaemia
- Graded exercise programme
- Vasodilators: limited value
- Antiplatelet drugs (aspirin)

**Surgical — AORTOILIAC OCCLUSION:**

| Extent | Operation |
|--------|-----------|
| Aorta + common iliac | Aortoiliac endarterectomy / Aortofemoral Dacron bypass |
| External iliac | External iliac endarterectomy (extraperitoneal) |
| Unilateral iliac (poor risk) | Femorofemoral Dacron bypass (subcutaneous) |
| Aortoiliac (poor risk) | Axillofemoral Dacron bypass (subcutaneous) |

**Surgical — FEMOROPOPLITEAL OCCLUSION:**
- Commonest site = distal superficial femoral artery in adductor canal (near adductor foramen)
- Long saphenous vein used as bypass graft (reversed)
- Balloon angioplasty — for short segmental stenosis; 10% risk of serious local complications

**Lumbar sympathectomy:**
- Indicated for trophic changes not amenable to reconstruction
- Increases skin circulation only (NOT muscle blood flow)
- Improvement seen in only 20–30% of patients

---

### ACUTE ARTERIAL OCCLUSION

#### Causes
1. **Embolism** (commonest) — thrombus from: AF, mitral stenosis, myocardial infarction, atrial myxoma, atheromatous plaques
2. **Acute thrombosis** on chronic atherosclerosis
3. **Trauma** — direct arterial injury, prolonged tourniquet

#### Embolism — Sites
- Bifurcation of aorta (saddle embolus) — both lower limbs involved
- Common femoral artery — most common site for single embolism
- Popliteal artery
- Brachial, axillary, mesenteric arteries

#### Clinical Features — 6 P's
| Sign | Meaning |
|------|---------|
| **Pain** | Sudden severe |
| **Pallor** | Skin becomes white |
| **Pulselessness** | Absent distal pulses |
| **Paraesthesia** | Tingling/numbness |
| **Paralysis** | Late sign — poor prognosis |
| **Perishing cold** | Cold limb |

> ★ Paralysis + paraesthesia = limb at risk; operate urgently within 6 hours

#### Treatment

**Medical:**
- Heparin immediately (5000–10000 IU IV) — prevents propagation
- Analgesics
- Keep limb dependent, NOT elevated

**Surgical — Embolectomy (Fogarty Catheter):**
- Gold standard treatment
- Incision over common femoral artery at groin (most common site)
- Embolus "pops out" on entering lumen
- Fogarty balloon catheter (No. 5 or 6) passed distally — balloon inflated — catheter withdrawn → removes distal thrombus
- Arteriotomy closed with 5/0 prolene
- Post-op: Heparin 5000 IU every 6 hours → oral Coumarin after 4 days

> ★ Metabolic acidosis from ischaemic tissue on revascularization → give sodium bicarbonate 100 mol or more systemically

---

### ANTERIOR COMPARTMENT SYNDROME

**Definition:** Raised pressure within the anterior compartment of the leg → compression of muscles and nerves → ischaemia

**Causes:** Tibial fracture, arterial injury, reperfusion after embolectomy, excessive exercise

**Clinical Features:**
- Dull ache → severe pain in anterior compartment
- Erythema over anterior compartment
- Tender anterior compartment on palpation
- Dorsalis pedis pulse diminished/absent (relatively LATE sign)
- Motor loss: first = anterior tibial + extensor hallucis longus → then extensor digitorum longus
- Sensory loss in area of peroneal nerve (late)

> ★ **Treatment: FASCIOTOMY immediately** — incision 2 cm lateral to shin bone through subcutaneous tissue and deep fascia; wound left OPEN for secondary suture

---

### RAYNAUD'S SYNDROME

**Definition:** Episodic vasospasm of small arteries/arterioles of distal extremities in response to cold or emotional stimuli.

**Three phases (classic):**
1. Intense PALLOR (spasm)
2. CYANOSIS (venous congestion)
3. RUBOR on warming (reactive hyperaemia)
Recovery: 15–45 minutes

**Raynaud's Disease (Primary):** Unknown aetiology; Women:Men = 5:1; 90% below 40 years

**Raynaud's Phenomenon (Secondary):** Associated with:
- **Immunologic/connective tissue:** Scleroderma, SLE, Rheumatoid arthritis, Dermatomyositis, Sjogren's
- **Obstructive:** Atherosclerosis, Buerger's disease, Thoracic outlet syndrome
- **Environmental:** Vibration injury, cold injury, trauma
- **Drugs:** Beta-blockers, ergotamine

**Treatment:**
- Avoid cold exposure, stop smoking
- Calcium channel blockers (nifedipine)
- Sympathectomy (cervical sympathectomy for upper limb) — when vasomotor index ≥3.5
- Prostaglandins (prostacyclin) for severe cases

---

### BUERGER'S DISEASE (THROMBOANGIITIS OBLITERANS)

**First described by:** Winiwarter 1879; Buerger published details in 1908 and 1924

**Definition:** Inflammatory reaction in arterial wall with involvement of neighbouring VEIN AND NERVE → terminating in thrombosis of the artery

**Incidence:** Men 20–40 years (most affected); Women = only 5–10%; more common in Jewish race

#### Aetiology
- **Cigarette smoking** — striking association (≥20 cigarettes/day usually required)
- Hormonal influence (sex distribution)
- Lower socio-economic groups; fibrinogen elevated; hyperaggregability of platelets
- Familial predisposition; blacks rarely affected
- Autonomic overactivity → severe peripheral vasospasm
- **Autoimmune aetiology** — antibodies + lymphocyte-mediated sensitivity to COLLAGEN
- Association with Rickettsial disease

> ★ **Immunologic process potentiated by cigarette smoking** = main pathogenesis

#### Pathology
- Diseased artery surrounded by **dense fibrotic reaction** incorporating adjacent **vein and nerve** — hence "incorporated bundle"
- ACUTE PHASE: intense inflammatory infiltrate with thrombus in arterial lumen containing PMNs and microabscesses
- CHRONIC PHASE: organised thrombus; vein included in fibrosis; nerve shows perineural fibrosis
- Unlike atherosclerosis: INTIMA and MEDIA relatively preserved; internal elastic lamina INTACT

#### Clinical Features
- Young men, heavy smokers
- BILATERAL, ASYMMETRIC involvement
- Starts in DISTAL small arteries → progresses proximally
- Intermittent claudication (initially foot claudication = pathognomonic, unlike calf in atherosclerosis)
- Rest pain → ulceration → gangrene of digits
- Migratory thrombophlebitis (pathognomonic)
- Raynaud's phenomenon may occur

#### Investigations
- Arteriography: "corkscrew" collaterals; disease of small calibre arteries
- Oscillometry: if NO pulsation in leg → amputate in thigh; if pulsation seen in leg → lower amputation
- Biopsy of involved vessel for histology

#### Treatment
- **STOP SMOKING completely** — most important; disease may arrest
- Vasodilators (limited value)
- Lumbar sympathectomy (lower limb) or cervical sympathectomy (upper limb) — only when vasomotor index ≥3.5
- Amputation when gangrene develops (lowest possible level)

> ★ Oscillometry guides level of amputation in Buerger's disease

---

### ANEURYSMS

**Definition:** Abnormal dilatation of an artery due to weakness of its wall

#### Types by Shape
| Type | Description |
|------|-------------|
| **Fusiform** | Uniform expansion of entire circumference → spindle-shaped; COMMONEST |
| **Saccular** | Expansion of only PART of circumference; usually traumatic |
| **Dissecting** | Blood forced through ruptured intima into tunica media (between inner + outer media) |

#### Types by True vs False
- **True aneurysm:** All three layers (intima, media, adventitia) form the wall
- **False/Pseudo aneurysm:** Pulsating haematoma contained by fibrous tissue only

#### Aetiology
**A. Congenital/Structural:** Berry aneurysms (circle of Willis); Marfan's syndrome; cervical rib poststenotic

**B. Degenerative (COMMONEST):**
- Atherosclerosis → most common cause; aorta + popliteal most common sites; >60 years; more in men
- Congenital mucoid degeneration in young South African Negroes

**C. Infective:**
- Syphilis → vasa vasorum obstruction → ischaemia of media → syphilitic aneurysm (thoracic aorta only; fusiform or saccular; NOW RARE)
- Mycotic aneurysm → misnomer; caused by Staph. aureus or Streptococcus (NOT fungus)
- Subacute bacterial endocarditis → infected embolus weakens peripheral artery wall
- Polyarteritis

**D. Traumatic:** Saccular aneurysm from penetrating wound; AV fistula formation

#### Dissecting Aneurysm — Special
- Intima ruptures beneath atheromatous plaque → blood enters between inner and outer layers of media
- Most common in THORACIC AORTA
- Classified (DeBakey): Type I = ascending + descending; Type II = ascending only; Type III = descending only
- Stanford: Type A = involves ascending aorta; Type B = descending only
- **Presentation:** Sudden "tearing" pain radiating to back; asymmetric BP in arms; aortic regurgitation
- **Type A = surgical emergency; Type B = medical (BP control)**

#### Abdominal Aortic Aneurysm (AAA)
- Usually below renal arteries
- Presents as pulsatile epigastric mass
- Risk of rupture increases with diameter >5 cm
- **Complications:** Rupture (retroperitoneal haematoma → shock), thrombosis, embolism, compression of adjacent structures
- **Treatment:** Elective repair when >5.5 cm or expanding; endovascular stent grafting (EVAR) or open surgery

---

## CHAPTER 16: DISEASES OF VEINS

---

### VARICOSE VEINS

**Definition:** Dilated, elongated and tortuous superficial veins

**Sites:** Lower limb superficial veins (long or short saphenous) | Oesophageal varices | Haemorrhoids | Varicocele

---

#### Surgical Anatomy

**I. Deep Veins:** Posterior tibial, peroneal, anterior tibial, popliteal, femoral — numerous valves; soleus venous sinuses/plexuses (NO valves) — "peripheral heart"

**II. Superficial Veins:**
- **Long (Great) Saphenous Vein (LSV)** — longest vein in body; medial marginal vein of foot → femoral vein 3 cm below inguinal ligament; 10–20 valves (more in leg than thigh); two constant valves: just before cribriform fascia + at saphenofemoral junction
- **Short (Small) Saphenous Vein (SSV)** — behind lateral malleolus → popliteal fossa; joins popliteal vein; about 12 valves; accompanied by sural nerve (⚠ damaged if stripped)

**III. Perforating (Communicating) Veins:** Connect deep to superficial; valves direct flow from superficial → deep (one way); if valves incompetent: high deep venous pressure transmitted to superficial veins

> ★ **Saphenous opening** = 3.5 cm below and lateral to pubic tubercle

---

#### Aetiology

**Primary (idiopathic):**
- Congenital valve weakness/absence
- Raised intra-abdominal pressure (pregnancy, obesity, constipation)
- Prolonged standing (occupation)
- Familial tendency

**Secondary:**
- Post-deep vein thrombosis (DVT) — valves destroyed
- Pelvic tumours pressing on iliac veins
- AV fistula
- Klippel-Trenaunay syndrome

---

#### Clinical Features

**Symptoms:**
- Cosmetic disfigurement
- Dull aching / heaviness in leg after prolonged standing, relieved by elevation
- Pruritus over varicosities
- Oedema of ankle (evening)

**Complications (EXAM FAVOURITE):**
| Complication | Details |
|--------------|---------|
| Varicose eczema | Pigmentation + dermatitis around ankle |
| Varicose ulcer | Lower 1/3 leg, medial side, gaiter area; COMMONEST ulcer of leg |
| Lipodermatosclerosis | Fibrosis of subcutaneous tissue |
| Superficial thrombophlebitis | Pain, redness, tenderness along vein |
| Bleeding | Rupture of varix (especially on standing) |
| Haemosiderosis | Brown pigmentation from RBC breakdown |

---

#### Clinical Tests

| Test | Method | Positive result |
|------|---------|-----------------|
| **Trendelenburg test** | Empty veins by elevation; compress saphenofemoral junction; stand up | Veins fill from below = perforator incompetence; fill immediately on release = saphenofemoral incompetence |
| **Tourniquet test** | Apply at different levels | Identifies level of incompetent perforators |
| **Perthes test** | Exercise with tourniquet on thigh | Pain + worsening = deep vein incompetent (contraindication to surgery) |
| **Schwartz test** | Percussion impulse transmitted along vein | Confirms vein is varicose and connected |
| **Doppler ultrasound** | Most accurate non-invasive test | Reverse flow on release of compression |

---

#### Treatment

**Conservative:**
- Compression stockings (Class II, above-knee)
- Elevation of foot end of bed
- Weight reduction
- Avoid prolonged standing

**Injection Sclerotherapy:**
- Suitable for: small varicosities below knee; residual veins after surgery
- Sclerosants: 3% sodium tetradecyl sulphate (STD) or ethanolamine oleate
- Injection at multiple sites → inflammatory reaction → fibrosis → obliteration
- Compression bandage maintained for 6 weeks

**Surgical Treatment:**
1. **Ligation at saphenofemoral junction** — incision below inguinal ligament; LSV ligated flush with femoral vein; all tributaries divided; NO stripping
2. **Ligation with stripping** — Myer's stripper (73 cm long); olive tip pushed from ankle to groin; saphenous nerve at risk (injury in <1% cases); SHORT SAPHENOUS VEIN — NOT stripped (damages sural nerve; long-standing oedema)
3. **Multiple avulsions/stab phlebectomy** — hook through small stab incisions for tributaries

> ★ Short saphenous vein is NOT stripped to protect the SURAL NERVE

**Postoperative:**
- Compression bandage immediately
- Replaced by thigh-length high-compression stocking after 1–2 days

---

### DEEP VEIN THROMBOSIS (DVT)

**Virchow's Triad:**
1. Stasis of blood flow
2. Hypercoagulability
3. Endothelial injury

**Risk factors:** Surgery (especially orthopaedic), immobility, malignancy, pregnancy, OCP, obesity, previous DVT, thrombophilia

**Clinical Features:**
- Calf pain, tenderness
- Swelling of calf/thigh
- Low-grade fever
- Homans' sign (calf pain on dorsiflexion) — not reliable
- Erythema over affected area

**Investigations:**
- Doppler ultrasound (duplex) — investigation of choice
- D-dimer — sensitive but not specific; if negative, DVT excluded
- Venography — gold standard but invasive

**Complications:**
- Pulmonary embolism (PE) — most dangerous
- Post-thrombotic syndrome (chronic venous insufficiency)
- Phlegmasia cerulea dolens — massive DVT; limb threatened

**Treatment:**
- LMWH → warfarin (INR 2–3) for 3–6 months
- Compression stockings
- Mobilisation with anticoagulation
- IVC filter if anticoagulation contraindicated
- Thrombolysis for massive iliofemoral DVT

---

## CHAPTER 17: DISEASES OF THE LYMPHATIC SYSTEM

---

### DISEASES OF LYMPHATICS

#### Acute Lymphangitis
- **Cause:** Beta-haemolytic Streptococci (most common); Staphylococci
- **Presentation:** Red streaks progressing towards regional lymph nodes; brawny oedema distally (lymph coagulation)
- **Treatment:** Rest + elevation + local heat; **Penicillin** (drug of choice); cloxacillin for penicillin-resistant Staph; incision almost always CONTRAINDICATED unless definite purulent collection

#### Chronic Lymphangitis
- Almost always follows repeated acute attacks
- Clinical importance = may precipitate acquired lymphoedema

---

#### Neoplasms of Lymphatics

**Benign (Developmental origin — seen in children from birth):**
- Seen in areas of jugular buds: neck, axilla, shoulder, groin

**Three types:**
| Type | Features | Treatment |
|------|---------|-----------|
| Simple/Capillary Lymphangioma (Lymphangioma circumscriptum) | Vesicles/blisters/elevated skin patches; inner thigh, shoulder, axilla; separate from main lymphatic | Excision (after confirming separation by lymphangiography; else chronic fistula risk) |
| Cavernous (Diffuse) Lymphangioma | Bigger swellings; face, tongue, floor of mouth, limbs | Surgery difficult; incomplete excision → recurrence |
| Cystic Hygroma | Large cystic swelling; transilluminates brilliantly; floor of mouth, neck; seen at birth | Excision (may be difficult near vital structures) |

> ★ Cystic hygroma — TRANSILLUMINATES brilliantly = key clinical feature

---

### DISEASES OF LYMPH NODES

#### Acute Lymphadenitis
- Secondary to infection in area drained
- Nodes: enlarged, tender, warm, painful
- Progress: → perilymphadenitis → abscess
- **Treatment:** Treat primary infection; antibiotics; drainage of abscess if formed

#### Chronic Lymphadenitis (Non-specific)
- Reactive hyperplasia following recurrent infections
- Nodes: firm, non-tender, mobile
- Distinguish from malignancy (biopsy if doubt)

---

#### Tuberculous Lymphadenitis (Scrofula)

**Commonest form of TB outside the lung**

**Stages:**
1. Discrete firm nodes
2. Matted nodes (periadenitis)
3. Cold abscess formation
4. Collar-stud abscess (tracks through deep fascia)
5. Sinus formation

**Sites:** Cervical (most common), axillary, inguinal, mesenteric

**Histology:** Eosin-stained caseation + giant cells + epithelioid cells + zone of lymphocytes and plasma cells + peripheral fibroblasts = TUBERCLE FOLLICLE

**Investigations:**
- ESR elevated
- Mantoux test positive
- CXR for primary focus
- FNAC/Biopsy — caseating granuloma
- Culture for AFB

**Treatment:**
- Antitubercular drugs (ATT): Streptomycin 0.5–1g IM daily + INH 300 mg/day + PAS 5–15 g/day (continue for 1.25 years); OR Ethambutol 25 mg/kg + Rifampicin 15 mg/kg for 9 months
- Supportive: nutritious diet + vitamins + high protein
- Surgery: if no response to ATT or remain static after initial response → excision along Langer's lines
- Cold abscess: aspirate BEFORE rupture through HEALTHY SKIN from ABOVE (not most dependent part — risk of sinus)

> ★ Aspiration of cold abscess through thick needle from above through healthy skin → prevents sinus formation

---

#### Syphilitic Lymphadenitis
| Stage | Nodes |
|-------|-------|
| Primary | Inguinal nodes with genital chancres; painless, discrete, firm, shotty; NO suppuration; extra-genital chancres → inflamed, painful, matted |
| Secondary | Generalised lymphadenopathy especially epitrochlear + occipital groups; painless + firm; skin rashes |
| Tertiary | Nodes seldom involved |

**Diagnosis:** WR + Kahn test positive; Treponema pallidum on dark-ground illumination; Treponemal haemagglutination assay

---

#### Filarial Lymphadenitis
- **Causative organism:** Wuchereria bancrofti
- **Affects:** Inguinal nodes (most common); more in males
- **Characteristic history:** Periodic fever + pain especially during **full or new moon**
- Lymphangiectasis of spermatic cord; thickening of scrotum
- Microfilariae appear in blood at NIGHT (nocturnal periodicity)
- Progressive → ELEPHANTIASIS
- **Treatment:** Diethylcarbamazine (DEC)

> ★ Filariasis — periodic fever with pain especially during full/new moon = characteristic

---

### LYMPHOEDEMA

**Definition:** Swelling due to accumulation of lymph in interstitial spaces from abnormal lymphatic function

#### Classification

**Primary Lymphoedema:**
| Type | Age of onset | Features |
|------|-------------|---------|
| Congenital (Milroy's disease) | Birth | Familial; bilateral leg oedema |
| Lymphoedema praecox | 10–25 years (COMMONEST) | Young females most often; lower extremities |
| Lymphoedema tarda | After 35 years | — |

**Secondary Lymphoedema:**
- **Causes:** Filariasis (most common worldwide) | Tuberculosis | Malignancy (direct invasion or post-radiotherapy) | Surgical excision of lymph nodes (e.g. post-mastectomy) | Recurrent cellulitis

**Stages:**
1. Pitting oedema (reversible — elevates overnight)
2. Pitting → non-pitting (fibrosis beginning)
3. Non-pitting firm oedema (irreversible)
4. Elephantiasis — gross skin changes, hyperkeratosis, papillomata

**Investigations:**
- Lymphangiography (lipiodol or Hypaque) — shows anatomy of lymphatics
- Isotope lymphoscintigraphy — functional assessment

**Treatment (conservative):**
- Elevation of the limb
- Compression garments / bandaging (graduated compression)
- Manual lymphatic drainage
- Pneumatic compression devices
- Treat underlying cause (DEC for filariasis)

**Treatment (surgical):**
- Charles's operation — excision of all skin, subcutaneous tissue and deep fascia → skin grafting on muscle
- Homan's operation — excision of wedge of subcutaneous tissue + skin suture (buried dermal flap)
- Thompson's buried dermal flap operation
- Microsurgical lymphovenous anastomosis (for primary lymphoedema with normal proximal nodes)

> ★ Charles's operation = radical excision for elephantiasis

---

## CHAPTER 18: THE PERIPHERAL NERVES

---

### STRUCTURE OF A PERIPHERAL NERVE

- **Nerve fibre** = axon + myelin sheath + neurilemma (sheath of Schwann)
- **Funiculus** = small bundle of nerve fibres within endoneurium
- **Perineurium** = sheath around each funiculus
- **Epineurium** = connective tissue holding multiple funiculi together (large nerve)
- Most cerebrospinal nerves = myelinated

---

### CLASSIFICATION OF NERVE INJURIES (Seddon)

| Type | Pathology | Recovery |
|------|-----------|---------|
| **Neurapraxia** | NO organic damage; temporary physiological paralysis; intact nerve fibre + sheath; caused by minor stretching/torsion/vibration of high-velocity missile | COMPLETE recovery; hours to weeks; NO Wallerian degeneration; NO reaction of degeneration |
| **Axonotmesis** | Rupture of AXONS within INTACT sheaths; Wallerian degeneration in distal portion; recovery by downgrowth into empty sheaths | Good quality recovery (sheaths intact preserve relative position); 1 mm/day after initial 10-day delay; last 3 weeks delay at end organ |
| **Neurotmesis** | Complete division of nerve + sheath; recovery only by surgical repair; disorganized regeneration | Incomplete recovery without surgery |

> ★ Rate of axonal regrowth = **1 mm per day** (initially 2 mm/day → reduces to 1 mm/day after ~2 months)
> 
> ★ After 10-day delay → axons grow at 1 mm/day → 3-week delay at end organ before full recovery

**Causes of Axonotmesis:**
- Fractures/dislocations + excessive manipulation
- Compression by tourniquet, callus, tight plaster cast

**Wallerian Degeneration:**
- Occurs in DISTAL portion of divided axon
- Myelin breaks down → phagocytosed
- Schwann cells proliferate → form "bands of Büngner" to guide regenerating axons

---

### PRINCIPLES OF NERVE REPAIR (Neurotmesis)

- Primary suture: immediate, if wound clean
- Secondary suture: after 3 weeks (delayed primary) or later
- Technique: Epineural suture (sutures in epineurium) vs fascicular repair
- Tension on repair → poor outcome
- Nerve gap → nerve grafting (sural nerve as graft)

---

### INDIVIDUAL NERVE INJURIES

---

#### 1. BRACHIAL PLEXUS INJURIES

**C5-C6 lesion (Upper trunk — Erb-Duchenne palsy):**
- Caused by: forcible separation of head and shoulder (obstetric, motorcycle accident, fall)
- Muscles affected: Deltoid, biceps, brachialis, supraspinatus, infraspinatus, teres minor
- "WAITER'S TIP" position: arm medially rotated + extended + adducted; forearm pronated; wrist flexed
- Sensory loss: lateral arm + forearm
- Treatment: conservative (recovery may occur); if ruptured → surgery

**C8-T1 lesion (Lower trunk — Klumpke's palsy):**
- Caused by: traction on abducted arm (grasping branch while falling)
- Small muscles of hand (intrinsics) paralysed
- "CLAW HAND" — hyperextension at MCP joints + flexion at IP joints
- Sensory loss: medial forearm + hand (C8, T1)
- Sympathetic involvement → Horner's syndrome (ptosis, miosis, anhidrosis, enophthalmos)

---

#### 2. AXILLARY NERVE (Circumflex Humeral Nerve)

**Passes through:** Quadrilateral space; winds round surgical neck of humerus (finger's breadth below centre of deltoid)

**Causes of injury:**
- Fracture/dislocation of neck of humerus
- Direct blow
- Intramuscular injections

**Effects:**
- Deltoid paralysis → failure of ABDUCTION of shoulder
- Teres minor paralysed
- Patch of anaesthesia over OUTER SIDE OF ARM (overlying deltoid)

---

#### 3. LONG THORACIC NERVE (Nerve of Bell)

**Origin:** C5, C6, C7
**Supplies:** Serratus anterior muscle

**Causes of injury:**
- Blows or heavy object falling on shoulder
- Operations on breast or chest wall

**Effect:**
- Serratus anterior paralysis → **"WINGING OF SCAPULA"**
- Demonstrated: patient pushes against wall with outstretched hands → vertebral border + inferior angle of scapula become prominent
- Cannot raise arm above right angle (from front) — due to inability to rotate scapula on chest wall

> ★ Winging of scapula = long thoracic nerve (nerve of Bell) injury

---

#### 4. RADIAL NERVE (Musculospiral Nerve)

**Sites of injury:**
- In axilla
- In radial groove of humerus
- At elbow (posterior interosseous nerve)

**Causes — IN AXILLA:**
- Crutch palsy — pressure by ill-adjusted crutch (after 4 hours without handgrips)
- Fractures/dislocations of upper end of humerus
- Rarely by new growth

**Causes — IN RADIAL GROOVE:**
- "Saturday night" paralysis — pressure on arm over edge of chair/footpath after excessive drink
- Prolonged tourniquet or ill-applied plaster at mid-humerus
- **Fracture of shaft of humerus** — 10% cases
- During operations on humerus (non-united fractures)

**Effects of radial nerve injury:**
- **WRIST DROP** (loss of extension of wrist) — characteristic
- Loss of extension of fingers and thumb
- Supination weakened
- Sensory loss: small area on dorsum of hand (anatomical snuffbox region + dorsum of proximal phalanges of radial 3.5 fingers)

> ★ Radial nerve injury = WRIST DROP | Saturday night paralysis | Crutch palsy

**Posterior Interosseous Nerve (at elbow):** Extension of fingers lost but wrist extension partially preserved (because extensor carpi radialis longus escapes — arises above elbow)

---

#### 5. MEDIAN NERVE

**Sites of injury:**
- At elbow — supracondylar fracture (most common cause in children)
- At wrist — carpal tunnel syndrome; laceration

**Effects (high lesion at elbow):**
- Loss of pronation of forearm
- Loss of flexion of wrist (FCR, PL)
- Loss of flexion of index + middle fingers
- "POINTING INDEX FINGER" (when asked to make fist)
- Loss of opposition of thumb
- Loss of sensation: lateral 3.5 fingers + palm (radial side)

**Effects (low lesion at wrist):**
- Thenar wasting (abductor pollicis brevis, opponens pollicis)
- "APE HAND" or "SIMIAN HAND" — thumb falls in plane of palm (abduction lost)
- Sensation: lateral 3.5 fingers
- Opposition of thumb lost

**Carpal Tunnel Syndrome:**
- Compression of median nerve under flexor retinaculum
- Causes: pregnancy, hypothyroidism, acromegaly, rheumatoid arthritis, repeated wrist movements
- Symptoms: tingling + numbness in median nerve territory (especially at night)
- Tinel's test positive (percussion over carpal tunnel)
- Phalen's test positive (wrist flexion)
- Treatment: splinting, steroids, surgical decompression

> ★ APE HAND = median nerve | CLAW HAND = ulnar nerve | WRIST DROP = radial nerve

---

#### 6. ULNAR NERVE

**Sites of injury:**
- Behind medial epicondyle at elbow (most common)
- At wrist

**Causes:**
- Fracture of medial epicondyle or lateral condyle
- Pressure (leaning on elbow)
- Gunshot wound
- Repeated friction at elbow

**Effects:**
- Loss of intrinsic muscles of hand (except thenar + lateral two lumbricals = median)
- Loss of hypothenar muscles
- **"CLAW HAND"** — hyperextension at MCP, flexion at IP joints (worse in ring + little finger)
- Wasting of hypothenar eminence + interossei (guttering between metacarpals)
- Loss of adduction of thumb → Froment's sign positive (uses FPL to grip paper)
- Sensory loss: medial 1.5 fingers + medial palm + medial forearm

> ★ Ulnar nerve: paradox — injury at elbow produces LESS claw than injury at wrist (because FDP also lost at elbow, reducing flexion at IP joints)

---

#### 7. SCIATIC NERVE

**Causes of injury:**
- Penetrating wounds of buttock
- Posterior dislocation of hip
- Badly placed IM injections in gluteal region

**Effects:**
- Complete loss below knee (all peroneal + tibial nerve territory)
- Hamstrings partially affected
- Foot drop

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#### 8. COMMON PERONEAL NERVE

**Most commonly injured nerve in lower limb**

**Site:** Winds round neck of fibula

**Causes:**
- Fracture of neck of fibula
- Tight plaster
- Prolonged compression (coma, squatting)
- "Crossing legs" habit

**Effects:**
- **FOOT DROP** (loss of dorsiflexion of foot)
- Loss of eversion
- High stepping gait (to clear foot)
- Sensory loss: dorsum of foot + lateral leg

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#### 9. TIBIAL NERVE (Medial Popliteal)

**Effects of injury:**
- Loss of plantar flexion and inversion
- Loss of toe flexion
- "Calcaneous deformity" of foot
- Sensory loss: sole of foot

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### NERVE TUMOURS

| Tumour | Type | Features | Association |
|--------|------|----------|-------------|
| Neurofibroma | Benign | Fusiform swelling on nerve; soft, slightly tender; moves perpendicular to nerve only | Neurofibromatosis (von Recklinghausen's disease): multiple neurofibromas + café-au-lait spots; AD inheritance |
| Neurilemmoma (Schwannoma) | Benign | Arises from Schwann cells; eccentric on nerve; encapsulated | Mostly solitary; occasionally malignant transformation |
| Neurosarcoma (Malignant neurofibrosarcoma) | Malignant | May arise from neurofibroma; rapid growth; local invasion + distant metastasis | Associated with NF1 in 50% |

> ★ Neurofibroma moves PERPENDICULAR to nerve axis — diagnostic sign

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## RAPID REVISION TABLE — HIGH-YIELD EXAM FACTS

| Question | Answer |
|----------|--------|
| Main cause of chronic arterial occlusion | Atherosclerosis |
| Commonest site of single embolus | Common femoral artery |
| Saddle embolus lodges at | Aortic bifurcation |
| 6 P's of acute ischaemia | Pain, Pallor, Pulselessness, Paraesthesia, Paralysis, Perishing cold |
| Fogarty catheter size for femoral embolectomy | No. 5 or 6 |
| Rate of nerve regeneration | 1 mm/day |
| Foot claudication = characteristic of | Buerger's disease |
| Pathognomonic of Buerger's = | Migratory thrombophlebitis |
| Buerger's: who is affected | Men 20–40 yrs; Jewish race; heavy smokers |
| Raynaud's phases | Pallor → Cyanosis → Rubor |
| Raynaud's disease sex ratio | Women:Men = 5:1 |
| Brown's vasomotor index for sympathectomy | ≥ 3.5 |
| Wrist drop | Radial nerve injury |
| Saturday night palsy | Radial nerve (radial groove) |
| Claw hand | Ulnar nerve injury |
| Ape/simian hand | Median nerve injury (low) |
| Waiter's tip | Erb-Duchenne (C5-C6) |
| Klumpke's + Horner's syndrome | C8-T1 + sympathetic fibre injury |
| Winging of scapula | Long thoracic nerve (Nerve of Bell) |
| Foot drop nerve | Common peroneal nerve |
| Most commonly injured nerve in lower limb | Common peroneal nerve (neck of fibula) |
| Tinel's sign | Tingling on tapping → nerve regeneration |
| Cystic hygroma — key sign | Transillumination (brilliantly) |
| Filariasis feature | Periodic fever during full/new moon |
| Lymphoedema praecox onset | 10–25 years (commonest primary lymphoedema) |
| Charles's operation | Radical excision for elephantiasis |
| Lymph aspiration of cold abscess — where? | Through healthy skin from ABOVE |
| Short saphenous vein NOT stripped because | Damages sural nerve |
| Saphenous opening location | 3.5 cm below and lateral to pubic tubercle |
| Longest vein in body | Long (great) saphenous vein |
| Compartment syndrome treatment | Fasciotomy immediately |
| Anterior compartment — first muscles paralysed | Anterior tibial + extensor hallucis longus |
| Mycotic aneurysm caused by | Staph. aureus / Streptococcus (NOT fungus — misnomer) |
| Syphilitic aneurysm site | Thoracic aorta only |
| Commonest aneurysm type | Fusiform |
| DVT investigation of choice | Duplex Doppler ultrasound |
| Virchow's triad | Stasis + Hypercoagulability + Endothelial injury |
| Sclerosant for varicose veins | 3% sodium tetradecyl sulphate (STD) |
| Myer's stripper length | 73 cm |
| Neurapraxia recovery | Complete; hours to weeks; NO Wallerian degeneration |
| Axonotmesis — initial delay before growth | 10 days (fortnight) |
| End organ delay after axon arrives | 3 weeks |
| Neurofibroma sign | Moves perpendicular to nerve axis only |
| Von Recklinghausen's disease | Multiple neurofibromas + café-au-lait spots (AD) |

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*Source: A Concise Textbook of Surgery — Chapters 15, 16, 17, 18 (Pages 187–335)*

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