"orbital apex syndrome" diagnosis treatment

orbital apex syndrome anatomy superior orbital fissure optic canal

ls /home/daytona/workspace/ 2>/dev/null && echo "---" && which weasyprint && whi…

which pandoc && pandoc --version | head -1; python3 -c "from reportlab.lib.pages…

mkdir -p /home/daytona/workspace/orbital-apex-essay

~/orbital-apex-essay/generate_pdf.py

from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.platypus import (
    SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle,
    HRFlowable, PageBreak, KeepTogether
)
from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_JUSTIFY
from reportlab.platypus import ListFlowable, ListItem

OUTPUT = "/home/daytona/workspace/orbital-apex-essay/Orbital_Apex_Syndrome.pdf"

doc = SimpleDocTemplate(
    OUTPUT,
    pagesize=A4,
    rightMargin=2.2*cm,
    leftMargin=2.2*cm,
    topMargin=2.5*cm,
    bottomMargin=2.5*cm,
    title="Orbital Apex Syndrome",
    author="Orris Medical AI",
    subject="Neuro-Ophthalmology",
)

# ── Colour palette ──────────────────────────────────────────────────────────
NAVY   = colors.HexColor("#0a2d6e")
TEAL   = colors.HexColor("#1a7a7a")
LTBLUE = colors.HexColor("#ddeeff")
LTGREY = colors.HexColor("#f4f6f9")
DKGREY = colors.HexColor("#333333")
WHITE  = colors.white

styles = getSampleStyleSheet()

# Custom styles
title_style = ParagraphStyle(
    "Title", parent=styles["Title"],
    fontSize=26, textColor=WHITE, alignment=TA_CENTER,
    fontName="Helvetica-Bold", spaceAfter=4, leading=30,
)
subtitle_style = ParagraphStyle(
    "Subtitle", parent=styles["Normal"],
    fontSize=12, textColor=colors.HexColor("#cce0ff"),
    alignment=TA_CENTER, fontName="Helvetica", spaceAfter=2,
)
h1_style = ParagraphStyle(
    "H1", parent=styles["Heading1"],
    fontSize=14, textColor=WHITE, fontName="Helvetica-Bold",
    spaceAfter=6, spaceBefore=14, leading=18,
    borderPad=(4, 6, 4, 6), backColor=NAVY,
    leftIndent=0, rightIndent=0,
)
h2_style = ParagraphStyle(
    "H2", parent=styles["Heading2"],
    fontSize=12, textColor=NAVY, fontName="Helvetica-Bold",
    spaceAfter=4, spaceBefore=10, leading=15,
    borderWidth=0, leftIndent=0,
)
h3_style = ParagraphStyle(
    "H3", parent=styles["Heading3"],
    fontSize=11, textColor=TEAL, fontName="Helvetica-BoldOblique",
    spaceAfter=3, spaceBefore=7, leading=14,
)
body_style = ParagraphStyle(
    "Body", parent=styles["Normal"],
    fontSize=10, textColor=DKGREY, fontName="Helvetica",
    spaceAfter=6, leading=15, alignment=TA_JUSTIFY,
)
bullet_style = ParagraphStyle(
    "Bullet", parent=body_style,
    leftIndent=16, bulletIndent=6, spaceAfter=3,
)
source_style = ParagraphStyle(
    "Source", parent=styles["Normal"],
    fontSize=8.5, textColor=colors.HexColor("#555555"),
    fontName="Helvetica-Oblique", spaceAfter=3, leading=12,
)
caption_style = ParagraphStyle(
    "Caption", parent=styles["Normal"],
    fontSize=8.5, textColor=colors.HexColor("#444444"),
    fontName="Helvetica-Oblique", alignment=TA_CENTER,
    spaceAfter=6, leading=11,
)
callout_style = ParagraphStyle(
    "Callout", parent=styles["Normal"],
    fontSize=10, textColor=NAVY, fontName="Helvetica-Oblique",
    leftIndent=14, rightIndent=14, spaceAfter=8, spaceBefore=4,
    leading=14, borderPad=8, borderWidth=1, borderColor=TEAL,
    backColor=LTBLUE,
)

def h1(text):
    return Paragraph(f"  {text}", h1_style)

def h2(text):
    return Paragraph(text, h2_style)

def h3(text):
    return Paragraph(text, h3_style)

def p(text):
    return Paragraph(text, body_style)

def b(items):
    """Return a list of bullet Paragraphs."""
    return [Paragraph(f"•   {item}", bullet_style) for item in items]

def callout(text):
    return Paragraph(f'<i>"{text}"</i>', callout_style)

def sp(h=0.3):
    return Spacer(1, h*cm)

def hr():
    return HRFlowable(width="100%", thickness=0.5, color=colors.HexColor("#bbccdd"), spaceAfter=4)

def table(data, col_widths, header_row=True):
    t = Table(data, colWidths=col_widths)
    style_cmds = [
        ("FONTNAME",    (0,0), (-1,-1), "Helvetica"),
        ("FONTSIZE",    (0,0), (-1,-1), 9),
        ("VALIGN",      (0,0), (-1,-1), "TOP"),
        ("ROWBACKGROUNDS", (0,1), (-1,-1), [WHITE, LTGREY]),
        ("GRID",        (0,0), (-1,-1), 0.4, colors.HexColor("#cccccc")),
        ("TOPPADDING",  (0,0), (-1,-1), 5),
        ("BOTTOMPADDING",(0,0), (-1,-1), 5),
        ("LEFTPADDING", (0,0), (-1,-1), 6),
        ("RIGHTPADDING",(0,0), (-1,-1), 6),
        ("WORDWRAP",    (0,0), (-1,-1), True),
    ]
    if header_row:
        style_cmds += [
            ("BACKGROUND",  (0,0), (-1,0), NAVY),
            ("TEXTCOLOR",   (0,0), (-1,0), WHITE),
            ("FONTNAME",    (0,0), (-1,0), "Helvetica-Bold"),
            ("FONTSIZE",    (0,0), (-1,0), 9.5),
        ]
    t.setStyle(TableStyle(style_cmds))
    return t

# ── Cover block builder ──────────────────────────────────────────────────────
def cover_table():
    cover_data = [[
        Paragraph("ORBITAL APEX SYNDROME", title_style),
    ]]
    cover_sub = [[
        Paragraph("A Comprehensive Medical Essay", subtitle_style),
    ]]
    cover_meta = [[
        Paragraph("Neuro-Ophthalmology &nbsp;|&nbsp; Emergency Medicine &nbsp;|&nbsp; Neurosurgery", subtitle_style),
    ]]
    date_p = [[
        Paragraph("Compiled: May 2026 &nbsp;|&nbsp; Orris Medical AI", subtitle_style),
    ]]

    t = Table(
        [cover_data[0], cover_sub[0], cover_meta[0], date_p[0]],
        colWidths=[17*cm]
    )
    t.setStyle(TableStyle([
        ("BACKGROUND",    (0,0), (-1,-1), NAVY),
        ("TOPPADDING",    (0,0), (-1,-1), 14),
        ("BOTTOMPADDING", (0,0), (-1,-1), 14),
        ("LEFTPADDING",   (0,0), (-1,-1), 18),
        ("RIGHTPADDING",  (0,0), (-1,-1), 18),
        ("ROWBACKGROUNDS",(0,0), (-1,-1), [NAVY]),
    ]))
    return t

# ════════════════════════════════════════════════════════════════════════════
# DOCUMENT CONTENT
# ════════════════════════════════════════════════════════════════════════════
story = []

# ── Cover ──────────────────────────────────────────────────────────────────
story.append(sp(3))
story.append(cover_table())
story.append(sp(1.2))
story.append(hr())
story.append(sp(0.5))
story.append(p("Orbital apex syndrome (OAS) is a complex neuro-ophthalmologic emergency characterised by "
               "simultaneous dysfunction of multiple cranial nerves and the optic nerve arising from a lesion "
               "at the posterior orbital apex. It represents the most severe and complete form of posterior "
               "orbital involvement, distinguishing itself from the closely related superior orbital fissure "
               "syndrome by the additional involvement of the optic nerve (CN II). Because of the density of "
               "critical neurovascular structures converging at this narrow anatomical corridor, even a small "
               "lesion at the orbital apex can produce a catastrophic clinical picture. Prompt recognition, "
               "accurate diagnosis, and aggressive management are imperative to prevent permanent blindness "
               "and life-threatening complications."))
story.append(sp(0.4))

# ── 1. Anatomy ────────────────────────────────────────────────────────────
story.append(h1("1.  Surgical Anatomy of the Orbital Apex"))
story.append(p("The orbital apex is the posterior apex of the bony orbit, formed primarily by the "
               "<b>lesser wing of the sphenoid bone</b> and its junction with the greater wing and the "
               "sphenoid body. Two critical apertures define this region:"))
story.append(sp())

story.append(h2("1.1  The Optic Canal"))
story += b([
    "Transmits <b>CN II (optic nerve)</b> and the <b>ophthalmic artery</b>.",
    "Bounded superiorly and laterally by the lesser wing of the sphenoid.",
    "Separated from the superior orbital fissure by the <b>optic strut</b> — a bony bridge of the sphenoid.",
    "Measures approximately 5–6 mm in length and 4–5 mm in diameter.",
])
story.append(sp())

story.append(h2("1.2  The Superior Orbital Fissure (SOF)"))
story.append(p("A cleft between the greater and lesser wings of the sphenoid, the SOF transmits:"))
story += b([
    "<b>CN III</b> (oculomotor nerve)",
    "<b>CN IV</b> (trochlear nerve)",
    "<b>CN VI</b> (abducens nerve)",
    "<b>CN V1</b> (ophthalmic division of trigeminal) — lacrimal, frontal, nasociliary, and other branches",
    "<b>Superior and inferior ophthalmic veins</b>",
    "<b>Sympathetic fibres</b> (from the cavernous sinus plexus)",
])
story.append(sp(0.3))
story.append(callout("CN V2 (maxillary division) exits via the foramen rotundum and is therefore NOT "
                     "involved in orbital apex syndrome — a key differentiating feature from cavernous "
                     "sinus syndrome, where V2 can be affected."))
story.append(p("The cavernous sinus lies contiguous with the orbital apex; thus, lesions can affect "
               "both structures simultaneously, producing impaired venous drainage and vascular engorgement "
               "of the orbital structures."))
story.append(sp(0.5))

# Anatomy table
story.append(h2("1.3  Structures at a Glance"))
anat_data = [
    ["Aperture", "Structures Transmitted", "Clinical Relevance"],
    ["Optic Canal", "CN II (optic nerve)\nOphthalmic artery", "Visual loss, afferent pupillary defect"],
    ["Superior Orbital\nFissure (SOF)", "CN III, CN IV, CN VI\nCN V1 (lacrimal, frontal, nasociliary)\nSup. & inf. ophthalmic veins\nSympathetics",
     "Ophthalmoplegia, ptosis, pupil dilation,\nsensory loss, proptosis, Horner syndrome"],
    ["Foramen Rotundum\n(NOT involved in OAS)", "CN V2 (maxillary division)", "Spared in OAS; involved in cavernous sinus syndrome"],
]
story.append(table(anat_data, [3.5*cm, 6.5*cm, 6.0*cm]))
story.append(sp(0.5))

# ── 2. Cranial Nerve Involvement ──────────────────────────────────────────
story.append(h1("2.  Cranial Nerve Involvement and Clinical Signs"))
story.append(p("Since OAS involves both the superior orbital fissure contents and the optic canal, "
               "the full syndrome encompasses multiple cranial nerves simultaneously. Partial deficits "
               "are common when the lesion is less severe or in an early phase."))
story.append(sp(0.3))

cn_data = [
    ["Structure", "Clinical Result"],
    ["CN II — Optic nerve", "Decreased visual acuity, visual field defects, afferent pupillary defect, optic atrophy"],
    ["CN III — Oculomotor", "Ptosis, internal ophthalmoplegia (fixed dilated pupil), paresis of medial/superior/inferior gaze"],
    ["CN IV — Trochlear", "Weakness of downward and inward gaze; oblique diplopia"],
    ["CN VI — Abducens", "Lateral gaze palsy; horizontal diplopia"],
    ["CN V1 — Ophthalmic", "Hypoaesthesia/anaesthesia of forehead, upper eyelid, cornea, conjunctiva; retrobulbar neuralgia"],
    ["Sympathetic fibres", "Horner syndrome (may be masked by CN III palsy): ptosis, miosis, anhidrosis"],
    ["Ophthalmic veins", "Proptosis (exophthalmos), chemosis, conjunctival injection, orbital congestion"],
]
story.append(table(cn_data, [4.5*cm, 12.0*cm]))
story.append(sp(0.4))
story.append(callout(
    "The key distinguishing feature from superior orbital fissure syndrome is the optic nerve involvement "
    "producing visual loss. "
    "Orbital apex syndrome can be differentiated from cavernous sinus pathology by decreased visual acuity "
    "since the optic nerve passes through the orbital apex. — Rosen's Emergency Medicine"
))
story.append(sp(0.5))

# ── 3. Etiology ───────────────────────────────────────────────────────────
story.append(h1("3.  Aetiology"))
story.append(p("OAS is a syndrome — a final common pathway — produced by diverse pathologies converging "
               "on the orbital apex. The major aetiological categories are:"))

story.append(h2("3.1  Infectious"))
story.append(h3("Fungal Infections (most feared)"))
story += b([
    "<b>Mucormycosis (Zygomycosis):</b> Occurs predominantly in poorly controlled diabetics and "
    "immunosuppressed patients. The rhinocerebral form spreads from the nasal passages through the "
    "sphenoid sinus to the orbital apex. Produces rapidly fatal syndrome with ophthalmoplegia, facial "
    "numbness, visual loss, and characteristic <b>violet/black discoloration</b> of nasal mucosa and "
    "eyelid tips. Requires emergency surgical debridement and IV amphotericin B. "
    "<b>Steroids are absolutely contraindicated.</b>",
    "<b>Aspergillosis:</b> Can spread from nasal/sinus passages to the orbital apex. Seen in "
    "immunosuppressed and diabetic patients. Biopsy is required for diagnosis.",
])
story.append(h3("Bacterial Infections"))
story += b([
    "<b>Orbital cellulitis:</b> Direct spread from sinusitis (most often ethmoid or sphenoid). "
    "Can progress to cavernous sinus thrombosis if untreated.",
    "<b>Herpes Zoster Ophthalmicus (HZO):</b> VZV reactivation in CN V1 produces OAS through "
    "direct neural inflammation, vasculitis, and perineural spread. Recent reviews (2024–2026) "
    "highlight this as an important under-recognised cause.",
    "<b>Other:</b> Tuberculosis, actinomycosis, and other granulomatous infections (rare).",
])
story.append(sp(0.2))

story.append(h2("3.2  Inflammatory / Idiopathic"))
story += b([
    "<b>Orbital inflammatory pseudotumor (IOIS):</b> A pleomorphic inflammatory mass that can "
    "extend to the orbital apex. Associated with systemic rheumatologic disorders (Wegener's "
    "granulomatosis, GCA, SLE, dermatomyositis, rheumatoid arthritis).",
    "<b>Tolosa-Hunt Syndrome:</b> Granulomatous inflammation of the orbital apex and/or carotid "
    "siphon within the cavernous sinus. Presents with acute pain, cranial neuropathy, and "
    "proptosis. Diagnosis of exclusion requiring steroid responsiveness.",
    "<b>IgG4-Related Orbital Disease:</b> Increasingly recognised cause of orbital apex involvement.",
    "<b>Sarcoidosis:</b> Infiltrative granulomatous involvement of the orbital apex.",
    "<b>Carotid-cavernous fistula:</b> Venous congestion at the orbital apex.",
])
story.append(sp(0.2))

story.append(h2("3.3  Neoplastic"))
story += b([
    "<b>Metastatic tumours:</b> Haematogenous spread from breast, lung, prostate carcinoma.",
    "<b>Direct extension:</b> Nasopharyngeal carcinoma, sphenoid sinus tumours, meningioma, lymphoma.",
    "<b>Primary tumours:</b> Lymphoma, perineural tumour spread, nerve sheath tumours.",
    "<i>Important note:</i> Lymphoma and idiopathic pseudotumor may both be steroid-responsive — "
    "lymphoma must be actively excluded before attributing response to idiopathic inflammation, "
    "especially when pain is absent or disease recurs on steroid taper.",
])
story.append(sp(0.2))

story.append(h2("3.4  Traumatic"))
story += b([
    "Orbital fractures involving the orbital apex, particularly in high-energy trauma (naso-orbito-ethmoid fractures).",
    "Orbital fissure syndrome results from fracture of the orbit involving the SOF with injury to CN III and CN V1.",
    "OAS occurs when the optic nerve is also involved, resulting in additional diminished visual acuity.",
    "Retrobulbar haematoma causing compartment syndrome can compress the optic nerve acutely.",
])
story.append(sp(0.2))

story.append(h2("3.5  Vascular"))
story += b([
    "<b>Pituitary apoplexy:</b> Haemorrhage within a pituitary tumour extending into the cavernous sinus and orbital apex.",
    "<b>Cavernous sinus thrombosis:</b> May propagate to involve the orbital apex.",
    "<b>Cavernous carotid aneurysm:</b> CN VI is typically involved first as it lies closest to the carotid artery.",
])
story.append(sp(0.5))

# Summary etiology table
story.append(h2("3.6  Aetiology Summary"))
etio_data = [
    ["Category", "Key Examples", "Special Features"],
    ["Fungal", "Mucormycosis, Aspergillosis", "Diabetic/immunosuppressed; biopsy required; no steroids"],
    ["Bacterial", "Orbital cellulitis, HZO", "Sinusitis origin; HZO — antiviral ± steroid"],
    ["Inflammatory", "Pseudotumor, Tolosa-Hunt, IgG4, Sarcoidosis", "Steroid-responsive; diagnose by exclusion"],
    ["Neoplastic", "Metastases, Lymphoma, Meningioma", "May mimic inflammation; biopsy essential"],
    ["Traumatic", "Orbital fracture, retrobulbar haematoma", "Urgent decompression may be needed"],
    ["Vascular", "Pituitary apoplexy, CC fistula", "Imaging/angiography required"],
]
story.append(table(etio_data, [3.2*cm, 5.5*cm, 7.8*cm]))
story.append(sp(0.5))

# ── 4. Clinical Presentation ─────────────────────────────────────────────
story.append(h1("4.  Clinical Presentation"))
story.append(p("The clinical picture depends on whether the syndrome is <b>complete</b> or <b>partial</b>. "
               "Partial deficits are common with less severe lesions or in the early phase. The following "
               "constitute the core clinical features:"))

story.append(h2("Core Features"))
story += b([
    "<b>Ophthalmoplegia (external ± internal):</b> Total or partial paralysis of extraocular movements "
    "due to CN III, IV, VI paresis. Diplopia is often the earliest symptom.",
    "<b>Ptosis:</b> Due to CN III paresis (levator palpebrae) and/or Horner syndrome (superior tarsal "
    "muscle). Contributes to periorbital swelling.",
    "<b>Fixed dilated pupil:</b> Internal ophthalmoplegia from CN III involvement. Pupil does not react "
    "to light or convergence.",
    "<b>Visual loss:</b> The hallmark distinguishing OAS from superior orbital fissure syndrome. Ranges "
    "from subtle visual field defects to complete blindness. Afferent pupillary defect (Marcus Gunn "
    "pupil) is present on swinging flashlight test.",
    "<b>Periorbital pain and hypoaesthesia:</b> CN V1 involvement — hypesthesia/anaesthesia of the "
    "forehead, upper eyelid, and cornea; retrobulbar neuralgia; photophobia.",
    "<b>Proptosis (exophthalmos):</b> From impaired venous drainage and/or mass effect in the orbit.",
    "<b>Chemosis and conjunctival injection:</b> Vascular engorgement from venous obstruction.",
    "<b>Papilloedema or optic atrophy:</b> Depending on acuity and duration of compression.",
    "<b>Horner syndrome:</b> From disruption of sympathetic fibres (ptosis, miosis, anhidrosis) — "
    "may be difficult to appreciate if a CN III lesion is also present.",
])
story.append(sp(0.3))
story.append(callout(
    "Both orbital inflammatory pseudotumor and orbital apex syndrome may result in proptosis, "
    "chemosis, and/or conjunctival injection. With orbital apex syndrome, there may be dysfunction "
    "of CNs II, III, IV, V, and VI. — Rosen's Emergency Medicine"
))
story.append(h2("Systemic Clues to Aetiology"))
story += b([
    "Fever + immunosuppression/poorly controlled diabetes → fungal infection (mucormycosis)",
    "Violet-black nasal/eyelid discolouration → mucormycosis",
    "Episodic orbital pain + steroid response → Tolosa-Hunt syndrome",
    "Known malignancy → metastatic disease",
    "Recent facial trauma → traumatic OAS / orbital fracture",
    "Vesicular periorbital rash → Herpes Zoster Ophthalmicus",
    "Bilateral involvement + thyroid disease → Graves orbitopathy (consider differential)",
])
story.append(sp(0.5))

# ── 5. Differential Diagnosis ─────────────────────────────────────────────
story.append(h1("5.  Differential Diagnosis"))
story.append(p("The most critical clinical distinctions are among posterior orbital and cavernous sinus "
               "syndromes:"))
story.append(sp(0.2))
diff_data = [
    ["Syndrome", "CN Involved", "Key Differentiator"],
    ["Orbital Apex Syndrome", "II, III, IV, VI, V1", "Visual loss (optic nerve) + proptosis; V2 spared"],
    ["Superior Orbital Fissure Syndrome", "III, IV, VI, V1 (NOT II)", "No visual loss; V2 spared"],
    ["Cavernous Sinus Syndrome", "III, IV, VI, V1 ± V2 ± Horner", "V2 may be involved; no proptosis typically"],
    ["Orbital Pseudotumor", "Variable CN involvement", "Steroid-responsive; systemic rheumatologic association"],
    ["Cavernous Sinus Thrombosis", "Similar to cavernous sinus syndrome", "Septic signs; bilateral; hypercoagulable state"],
    ["Pituitary Apoplexy", "III, IV, VI ± II", "Sudden severe headache; visual field defect; MRI pituitary"],
]
story.append(table(diff_data, [4.5*cm, 4.2*cm, 7.8*cm]))
story.append(sp(0.5))

# ── 6. Investigations ─────────────────────────────────────────────────────
story.append(h1("6.  Investigations"))
story.append(h2("6.1  Imaging"))
story += b([
    "<b>MRI orbit with gadolinium contrast (investigation of choice):</b> Allows assessment for "
    "enhancement and enlargement of extraocular muscles, orbital structures, the optic nerve sheath, "
    "and the superior orbital fissure. Fat-suppressed (STIR/fat-sat) sequences are critical for "
    "detecting orbital fat infiltration at the apex. Provides superior soft-tissue characterisation "
    "compared with CT.",
    "<b>CT orbit with fine cuts (contrast-enhanced):</b> More readily available; excellent for bony "
    "detail including fractures and sinus disease (particularly sphenoid sinusitis). Second-line to "
    "MRI. Useful in the emergency setting.",
    "<b>CT venography:</b> If cavernous sinus thrombosis is suspected.",
    "<b>MR angiography / digital subtraction angiography:</b> If carotid-cavernous fistula or "
    "aneurysm is suspected.",
])
story.append(sp(0.2))

story.append(h2("6.2  Microbiological and Pathological"))
story += b([
    "<b>Biopsy (emergency orbitotomy):</b> Mandatory when imaging and lumbar puncture do not yield "
    "a diagnosis and symptoms are progressing. Fungal infections and lymphoma can only be reliably "
    "diagnosed by tissue.",
    "Blood cultures, ESR, CRP, CBC, HbA1c, serum glucose — baseline workup.",
    "Immunological panel: ANA, ANCA, ACE level (sarcoidosis), serum IgG4, serum protein electrophoresis.",
    "Fungal serology/cultures; tissue KOH preparation; culture on Sabouraud's medium.",
])
story.append(sp(0.2))

story.append(h2("6.3  Other Investigations"))
story += b([
    "Lumbar puncture: CSF analysis for infection (including fungal culture), malignant cells, oligoclonal bands.",
    "VZV PCR/serology if HZO is suspected.",
    "PET-CT or bone marrow biopsy if lymphoma is suspected.",
    "Thyroid function tests if Graves disease is in the differential.",
    "Erythrocyte sedimentation rate (ESR) and CRP in all elderly patients (rule out giant cell arteritis).",
])
story.append(sp(0.5))

# ── 7. Management ─────────────────────────────────────────────────────────
story.append(h1("7.  Management"))
story.append(p("Management is directed entirely at the <b>underlying aetiology</b>. There is no single "
               "treatment for OAS as a syndrome. The approach should involve ophthalmology, neurology, "
               "infectious disease, and/or neurosurgery as appropriate."))

story.append(h2("7.1  Infectious Causes"))
story.append(h3("Mucormycosis — Medical Emergency"))
story += b([
    "Urgent <b>surgical debridement</b> of all necrotic tissue (nasal/sinus/orbital) — cornerstone of management.",
    "<b>IV Liposomal Amphotericin B</b> at 5–10 mg/kg/day — antifungal of choice.",
    "Optimise blood glucose control aggressively.",
    "<b>Steroids are absolutely contraindicated</b> — they worsen fungal infections and can be fatal.",
    "Isavuconazole or posaconazole may be used as step-down or salvage therapy.",
])
story.append(h3("Aspergillosis"))
story += b([
    "<b>Voriconazole</b> is first-line antifungal therapy.",
    "Surgical debridement in severe or progressive cases.",
])
story.append(h3("Herpes Zoster Ophthalmicus"))
story += b([
    "IV <b>Acyclovir</b> (10 mg/kg every 8 h) or high-dose oral valacyclovir.",
    "Systemic corticosteroids combined with antivirals — recent evidence (PMID 38108804, PMID 40998734) "
    "supports improved outcomes.",
    "Ophthalmology follow-up within 24–48 hours.",
])
story.append(h3("Bacterial Orbital Cellulitis"))
story += b([
    "IV broad-spectrum antibiotics covering gram-positive, gram-negative, and anaerobes.",
    "Surgical drainage if abscess is present.",
    "CT/MRI to define extent of spread.",
])
story.append(sp(0.2))

story.append(h2("7.2  Inflammatory / Idiopathic Causes"))
story += b([
    "<b>High-dose systemic corticosteroids</b> are the mainstay for orbital pseudotumor and Tolosa-Hunt "
    "syndrome — typically a dramatic response confirms the diagnosis.",
    "Steroid-sparing immunosuppressives (methotrexate, azathioprine, mycophenolate mofetil) for "
    "relapsing or steroid-dependent cases.",
    "Antimetabolites and cytotoxic agents are increasingly used in refractory IOIS.",
    "<b>Rituximab</b> may be considered for IgG4-related orbital disease refractory to steroids.",
    "<i>Caution:</i> If fungal infection cannot be excluded, avoid steroids until proven otherwise.",
])
story.append(sp(0.2))

story.append(h2("7.3  Neoplastic Causes"))
story += b([
    "<b>Lymphoma:</b> Chemotherapy ± radiotherapy (often steroid-responsive — do not mistake for "
    "idiopathic inflammation without tissue diagnosis).",
    "<b>Metastases:</b> Radiation therapy ± systemic oncological treatment per primary tumour.",
    "<b>Meningioma / direct invasion:</b> Surgical resection ± adjuvant radiation.",
])
story.append(sp(0.2))

story.append(h2("7.4  Traumatic Causes"))
story += b([
    "Optic nerve decompression (surgical or endoscopic endonasal approach) for traumatic optic neuropathy.",
    "High-dose corticosteroids: controversial; use case-by-case.",
    "Emergency lateral canthotomy if retrobulbar haematoma with compartment syndrome.",
    "Subspecialty consultation (ophthalmology, neurosurgery, facial surgery) before discharge.",
])
story.append(sp(0.2))

story.append(h2("7.5  Emergency Biopsy"))
story.append(callout(
    "When MRI with contrast and lumbar puncture do not reveal a specific diagnosis and symptoms are "
    "progressive, emergency orbitotomy and biopsy are warranted. "
    "— Neuroanatomy Through Clinical Cases, 3rd Ed."
))
story.append(sp(0.5))

# Management algorithm table
story.append(h2("7.6  Management Algorithm Summary"))
mgmt_data = [
    ["Aetiology", "First-Line Treatment", "Key Cautions"],
    ["Mucormycosis", "Surgical debridement + IV Liposomal Amphotericin B", "AVOID steroids; optimise glucose"],
    ["Aspergillosis", "Voriconazole ± surgical debridement", "Biopsy required for diagnosis"],
    ["HZO", "IV Acyclovir + systemic corticosteroids", "Combine antiviral + steroid"],
    ["Bacterial cellulitis", "IV broad-spectrum antibiotics ± drainage", "CT/MRI to exclude abscess"],
    ["Pseudotumor / Tolosa-Hunt", "High-dose systemic corticosteroids", "Exclude fungal/lymphoma first"],
    ["Lymphoma", "Chemotherapy ± radiotherapy", "Biopsy before steroids if possible"],
    ["Metastases", "Radiation + systemic oncology", "Identify primary tumour"],
    ["Traumatic", "Decompression ± steroids", "Urgent ophthalmology + neurosurgery"],
    ["Unknown (progressive)", "Emergency orbitotomy + biopsy", "Do not delay biopsy"],
]
story.append(table(mgmt_data, [3.5*cm, 6.5*cm, 6.5*cm]))
story.append(sp(0.5))

# ── 8. Prognosis ──────────────────────────────────────────────────────────
story.append(h1("8.  Prognosis"))
story.append(p("Prognosis depends critically on the speed of diagnosis and treatment, the underlying "
               "aetiology, and the extent of optic nerve injury at presentation."))
story += b([
    "<b>Fungal OAS</b> (especially mucormycosis) carries a mortality of <b>50–80%</b> if untreated or "
    "delayed. Early surgical debridement and antifungal therapy dramatically improve survival.",
    "<b>Inflammatory causes</b> (pseudotumor, Tolosa-Hunt) have excellent responses to corticosteroids "
    "and a generally favourable prognosis for recovery of CN function.",
    "<b>Metastatic/neoplastic disease</b> carries the worst long-term prognosis, depending on the "
    "primary tumour.",
    "<b>Visual recovery</b> may be incomplete even with appropriate treatment if the optic nerve has "
    "sustained significant pressure injury, ischaemia, or demyelination.",
    "<b>Extraocular motility:</b> CN III, IV, VI palsies may resolve partially or completely with "
    "treatment. Aberrant regeneration can occur following CN III recovery.",
    "<b>Herpes zoster OAS</b> may have prolonged CN deficits; prognosis is improving with early "
    "combined antiviral and corticosteroid therapy.",
])
story.append(sp(0.5))

# ── 9. Related Eponyms ────────────────────────────────────────────────────
story.append(h1("9.  Related Eponymous Syndromes"))
story.append(sp(0.2))
epo_data = [
    ["Syndrome", "Structures Involved", "Description"],
    ["Orbital Apex Syndrome\n(Full)", "CN II, III, IV, VI, V1 +\nOphthalmic veins", "Optic nerve + SOF + orbital vein involvement"],
    ["Superior Orbital Fissure\nSyndrome", "CN III, IV, VI, V1\n(NOT CN II)", "SOF contents only; no optic nerve; no visual loss"],
    ["Rollet Syndrome\n(Orbital Apex-Sphenoidal)", "CN III, IV, VI +\nOptic + CN V1", "Ptosis, diplopia, ophthalmoplegia, optic atrophy,\nhyperaesthesia/anaesthesia, retrobulbar neuralgia,\nexophthalmos, papilloedema"],
    ["Cavernous Sinus Syndrome", "CN III, IV, VI, V1 ± V2\n± Horner", "V2 may be involved; no proptosis typically;\nno optic nerve involvement"],
    ["Tolosa-Hunt Syndrome", "CN III, IV, VI, V1", "Idiopathic granulomatous inflammation of orbital apex\nand/or cavernous sinus; diagnosis of exclusion;\nsteroid-responsive"],
]
story.append(table(epo_data, [4.0*cm, 4.0*cm, 8.5*cm]))
story.append(sp(0.5))

# ── 10. Summary Box ───────────────────────────────────────────────────────
story.append(h1("10.  Summary"))
story.append(callout(
    "Orbital apex syndrome is a neurologic and ophthalmologic emergency caused by lesions "
    "compressing or infiltrating the orbital apex — the convergence zone of the optic canal "
    "and superior orbital fissure. The complete syndrome consists of optic neuropathy (CN II), "
    "ophthalmoplegia (CN III, IV, VI), sensory loss (CN V1), and proptosis. CN V2 is characteristically "
    "spared, distinguishing it from cavernous sinus syndrome. Key aetiologies include fungal "
    "infections (especially mucormycosis and aspergillosis in diabetics/immunosuppressed), bacterial "
    "orbital cellulitis, neoplasms (metastases, lymphoma, direct extension), and idiopathic "
    "inflammatory conditions (pseudotumor, Tolosa-Hunt syndrome). Orbital MRI with gadolinium is "
    "the imaging modality of choice. Treatment targets the underlying cause: antifungals (never "
    "steroids) for fungi, high-dose corticosteroids for idiopathic inflammation, and oncological "
    "therapy for neoplasia. Emergency biopsy is mandatory when the cause remains uncertain and "
    "the condition progresses."
))
story.append(sp(0.5))

# ── 11. References ────────────────────────────────────────────────────────
story.append(h1("11.  References"))
refs = [
    "K.J. Lee's Essential Otolaryngology, 11th Edition — Head and Neck Surgery.",
    "Blumenfeld H. Neuroanatomy Through Clinical Cases, 3rd Edition. Sinauer Associates.",
    "Rosen's Emergency Medicine: Concepts and Clinical Practice, 9th Edition. Elsevier.",
    "Tintinalli JE. Tintinalli's Emergency Medicine: A Comprehensive Study Guide, 9th Edition. McGraw-Hill.",
    "Bradley and Daroff's Neurology in Clinical Practice, 8th Edition. Elsevier.",
    "Grainger & Allison's Diagnostic Radiology: A Textbook, 7th Edition. Elsevier.",
    "The Wills Eye Manual: Office and Emergency Room Diagnosis and Treatment, 8th Edition.",
    "Localization in Clinical Neurology, 8th Edition. Wolters Kluwer.",
    "Li JXL, Tong JY, Tumuluri K. Orbital apex syndrome in herpes zoster ophthalmicus: clinical features, "
    "treatment and outcomes — a case series and literature review. Orbit. 2024 Dec. PMID: 38108804.",
    "Dupré R, Grosse JP, Baillif S. Orbital Apex Syndrome Secondary to Herpes Zoster Ophthalmicus: "
    "A Literature Review and In-Depth Understanding. Semin Ophthalmol. 2026 May. PMID: 40998734.",
    "Borchard NA, Nayak JV. Orbital Apex Syndrome. N Engl J Med. 2018 Apr 26; 378(17): e23.",
]
for i, ref in enumerate(refs, 1):
    story.append(Paragraph(f"[{i}] {ref}", source_style))
    story.append(sp(0.1))

# ── Build ──────────────────────────────────────────────────────────────────
doc.build(story)
print(f"PDF written to: {OUTPUT}")

python3 /home/daytona/workspace/orbital-apex-essay/generate_pdf.py

ls -lh /home/daytona/workspace/orbital-apex-essay/Orbital_Apex_Syndrome.pdf