Robbins pathology COPD atherosclerosis cirrhosis osteosarcoma diabetes leprosy standard pathology overview

pathology education AND review

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mkdir -p "/tmp/workspace/pathology-revision/src" "/tmp/workspace/pathology-revision/output"

python - <<'PY' from pathlib import Path p=Path('/tmp/workspace/pathology-revision/src/create_pdf.py') p.write_text(r'''from reportlab.lib.pagesizes import A4 from reportlab.lib import colors from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.enums import TA_CENTER, TA_LEFT from reportlab.lib.units import cm from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, PageBreak, Table, TableStyle, KeepTogether from reportlab.pdfbase.pdfmetrics import stringWidth OUT='/tmp/workspace/pathology-revision/output/High_Yield_Pathology_Revision.pdf' styles=getSampleStyleSheet() styles.add(ParagraphStyle(name='Title2', parent=styles['Title'], fontName='Helvetica-Bold', fontSize=25, leading=30, textColor=colors.HexColor('#8B1E3F'), alignment=TA_CENTER, spaceAfter=14)) styles.add(ParagraphStyle(name='SubTitle', parent=styles['Normal'], fontSize=11, leading=15, alignment=TA_CENTER, textColor=colors.HexColor('#444444'))) styles.add(ParagraphStyle(name='H1x', parent=styles['Heading1'], fontName='Helvetica-Bold', fontSize=16, leading=20, textColor=colors.white, backColor=colors.HexColor('#8B1E3F'), borderPadding=(6,8,6), spaceBefore=12, spaceAfter=9)) styles.add(ParagraphStyle(name='H2x', parent=styles['Heading2'], fontName='Helvetica-Bold', fontSize=12.5, leading=15, textColor=colors.HexColor('#8B1E3F'), spaceBefore=10, spaceAfter=5)) styles.add(ParagraphStyle(name='Bodyx', parent=styles['BodyText'], fontName='Helvetica', fontSize=9.1, leading=12.2, spaceAfter=4)) styles.add(ParagraphStyle(name='Tiny', parent=styles['BodyText'], fontName='Helvetica', fontSize=8, leading=10.3, spaceAfter=2)) styles.add(ParagraphStyle(name='Box', parent=styles['BodyText'], fontName='Helvetica-Bold', fontSize=8.8, leading=11, textColor=colors.HexColor('#23395B'), backColor=colors.HexColor('#EAF2F8'), borderColor=colors.HexColor('#B4C7E7'), borderWidth=.5, borderPadding=6, spaceBefore=5, spaceAfter=7)) story=[] def P(s, st='Bodyx'): story.append(Paragraph(s, styles[st])) def H(s, l=1): story.append(Paragraph(s, styles['H1x' if l==1 else 'H2x'])) def bullets(items): for x in items: P('&bull; '+x) def box(s): P(s,'Box') def table(rows,widths=None): data=[[Paragraph(str(c),styles['Tiny']) for c in row] for row in rows] t=Table(data,colWidths=widths,repeatRows=1,hAlign='LEFT') t.setStyle(TableStyle([('BACKGROUND',(0,0),(-1,0),colors.HexColor('#23395B')),('TEXTCOLOR',(0,0),(-1,0),colors.white),('FONTNAME',(0,0),(-1,0),'Helvetica-Bold'),('GRID',(0,0),(-1,-1),.3,colors.HexColor('#B7C4D6')),('VALIGN',(0,0),(-1,-1),'TOP'),('BACKGROUND',(0,1),(-1,-1),colors.HexColor('#F8FAFC')),('LEFTPADDING',(0,0),(-1,-1),5),('RIGHTPADDING',(0,0),(-1,-1),5),('TOPPADDING',(0,0),(-1,-1),4),('BOTTOMPADDING',(0,0),(-1,-1),4)])) story.append(t); story.append(Spacer(1,6)) # cover story += [Spacer(1,3.5*cm), Paragraph('HIGH-YIELD<br/>PATHOLOGY REVISION',styles['Title2']), Paragraph('Respiratory, cardiovascular, hepatobiliary, musculoskeletal, endocrine and skin pathology',styles['SubTitle']), Spacer(1,.8*cm)] box('<b>Organized by examination weightage:</b> 10-mark long answers, 5-mark short notes and 3-mark rapid recall. Use the bold headings as your answer framework; reproduce morphology and key lists precisely.') H('How to use this booklet',2) bullets(['<b>10 marks:</b> Definition - etiopathogenesis - morphology - clinical features/complications.', '<b>5 marks:</b> 5 to 7 sharply written points. Add gross and microscopy where relevant.', '<b>3 marks:</b> Definition plus 3 to 5 discriminating points. Avoid long prose.', '<b>★</b> denotes repeatedly tested/high-yield content from your list.']) P('Prepared as a compact revision aid. Verify terminology and local university preferences against your prescribed textbook and faculty notes.', 'Tiny') story.append(PageBreak()) H('10-MARK QUESTIONS') P('Write an introductory definition, then use the subheadings below. Diagrams that score: emphysema acinus, atherosclerotic plaque, cirrhotic liver, osteosarcoma sunburst/Codman triangle.') H('1. COPD: etiology, pathogenesis and clinical features',2) box('<b>Definition:</b> A preventable, treatable disease characterized by persistent airflow limitation that is usually progressive, due to small-airway disease and parenchymal destruction (chronic bronchitis and emphysema).') bullets(['<b>Etiology/risk factors:</b> Cigarette smoking (major); biomass fuel/air pollution; occupational dusts; recurrent infections; airway hyper-responsiveness; alpha-1 antitrypsin deficiency; increasing age.', '<b>Pathogenesis:</b> Inhaled irritants cause epithelial/macrophage activation. Neutrophils, macrophages and CD8+ T cells release proteases, oxidants and inflammatory mediators. Protease-antiprotease imbalance plus oxidative stress destroys elastin/alveolar walls. Mucus hypersecretion, ciliary dysfunction, bronchiolar fibrosis and loss of elastic recoil cause expiratory airflow obstruction and air trapping.', '<b>Morphology:</b> Chronic bronchitis: enlarged mucus glands, goblet-cell hyperplasia, mucous plugging, chronic bronchiolar inflammation/fibrosis. Emphysema: enlarged airspaces distal to terminal bronchioles with septal destruction.', '<b>Clinical:</b> Progressive exertional dyspnea, chronic cough, sputum, wheeze and prolonged expiration. “Blue bloater” phenotype: bronchitic, cyanotic, hypercapnic. “Pink puffer”: emphysematous, thin, severe dyspnea. Late: pulmonary hypertension, cor pulmonale, respiratory failure and exacerbations.']) H('2. Atherosclerosis: etiopathogenesis, morphology and fate of thrombus',2) box('<b>Definition:</b> A chronic inflammatory intimal disease of large and medium arteries with atheromatous plaques containing lipid, inflammatory cells, smooth-muscle cells and fibrous tissue.') bullets(['<b>Risk factors:</b> Non-modifiable: age, male sex, family history/genetic predisposition. Major modifiable: hyperlipidemia (raised LDL, low HDL), hypertension, smoking, diabetes. Others: obesity, sedentary life, inflammation, hyperhomocysteinemia.', '<b>Pathogenesis - response to injury:</b> Endothelial dysfunction and increased permeability permit LDL entry. LDL is oxidized; monocytes adhere, enter intima and form foam cells. Platelets and macrophages release mediators. Smooth-muscle migration/proliferation and extracellular-matrix deposition create a fibrous cap over a lipid-necrotic core.', '<b>Morphology:</b> Fatty streaks are flat intimal yellow spots of foam cells. Atheromatous plaque: raised intimal lesion with fibrous cap (SMCs, collagen) and central necrotic lipid core with cholesterol clefts, foam cells and calcification. Common in abdominal aorta, coronary, popliteal, internal carotid and circle of Willis vessels.', '<b>Complications:</b> Stenosis/ischemia; plaque rupture, erosion or hemorrhage with superimposed thrombosis; atheroembolism; weakening of media causing aneurysm.', '<b>Fate of thrombus:</b> Propagation, embolization, dissolution by fibrinolysis, or organization with recanalization/incorporation into vessel wall.']) H('3. Rheumatic fever and rheumatic heart disease',2) box('<b>Definition:</b> Acute rheumatic fever is an immunologically mediated multisystem inflammatory disease following group A streptococcal pharyngitis. Rheumatic heart disease is its chronic valvular sequel.') bullets(['<b>Pathogenesis:</b> Molecular mimicry: antibodies/T cells to streptococcal M proteins cross-react with cardiac and other tissues. It follows pharyngitis, not skin infection.', '<b>Acute pancarditis:</b> Pericarditis with fibrinous “bread-and-butter” exudate; myocarditis with <b>Aschoff bodies</b> (central fibrinoid necrosis, lymphocytes, plasma cells, activated macrophages called Anitschkow cells); endocarditis with small sterile vegetations along lines of valve closure.', '<b>Chronic RHD:</b> Mitral valve most commonly affected, followed by aortic. Leaflet thickening, commissural fusion and shortened/fused chordae cause “fish-mouth” stenosis; may also cause regurgitation.', '<b>Clinical:</b> Migratory polyarthritis, carditis, subcutaneous nodules, erythema marginatum and Sydenham chorea. Chronic disease causes dyspnea, atrial fibrillation, mural thrombosis/embolism, pulmonary hypertension and heart failure.']) H('4. Infective endocarditis',2) bullets(['<b>Definition:</b> Infection of endocardial surface, usually cardiac valves, with friable vegetations containing organisms and inflammatory cells.', '<b>Acute IE:</b> Usually S. aureus; may infect normal valves; destructive, rapidly progressive. <b>Subacute IE:</b> Viridans streptococci/enterococci; commonly on previously abnormal valves; indolent.', '<b>Pathogenesis:</b> Bacteremia seeds abnormal endocardium or prosthetic material. Vegetations occur on valves, especially mitral/aortic; right-sided disease is common in intravenous drug use.', '<b>Morphology/complications:</b> Large irregular friable vegetations may erode cusps and form ring abscesses. Complications: valvular insufficiency and heart failure, septic emboli/infarcts/abscesses, immune-complex glomerulonephritis, mycotic aneurysm. Blood cultures are central to diagnosis.']) H('5. Cirrhosis and alcoholic liver disease',2) box('<b>Cirrhosis:</b> Diffuse hepatic fibrosis with regenerative nodules that distort normal architecture and vascular relationships.') bullets(['<b>Causes:</b> Alcohol, chronic hepatitis B/C, metabolic dysfunction-associated steatotic liver disease, biliary disease, autoimmune hepatitis, hemochromatosis, Wilson disease and drugs.', '<b>Pathogenesis:</b> Repeated hepatocyte injury/inflammation activates stellate cells to myofibroblasts, depositing collagen in sinusoids and portal tracts. Fibrous septa plus regenerating nodules cause portal hypertension and impaired liver function.', '<b>Alcoholic liver disease spectrum:</b> (1) Fatty liver: reversible macrovesicular steatosis. (2) Alcoholic hepatitis: ballooning degeneration, neutrophilic infiltration, Mallory-Denk bodies and pericellular “chicken-wire” fibrosis. (3) Cirrhosis: initially micronodular, later mixed/macro-nodular.', '<b>Clinical/complications:</b> Jaundice, ascites, splenomegaly, varices, encephalopathy, coagulopathy, hepatorenal syndrome and increased HCC risk.']) H('6. Fatty liver: etiopathogenesis and pathology',2) bullets(['<b>Definition:</b> Steatosis is abnormal accumulation of triglycerides within hepatocytes.', '<b>Causes:</b> Alcohol, obesity/insulin resistance/diabetes, malnutrition, hypoxia, toxins/drugs and acute fatty liver of pregnancy.', '<b>Mechanisms:</b> Increased fatty-acid delivery/synthesis; reduced fatty-acid oxidation; reduced apoprotein synthesis; impaired lipoprotein export.', '<b>Morphology:</b> Enlarged, soft, yellow, greasy liver. Microscopy: macrovesicular fat vacuoles begin centrilobularly and may become panlobular; nucleus is displaced peripherally. Microvesicular steatosis occurs in severe mitochondrial dysfunction.', '<b>Outcome:</b> Often reversible if cause is removed; persistent injury may progress to steatohepatitis, fibrosis and cirrhosis.']) H('7. Osteosarcoma: classification of bone tumours and features ★',2) bullets(['<b>Classification:</b> Benign: osteochondroma, enchondroma, osteoid osteoma, giant-cell tumor (locally aggressive). Malignant: osteosarcoma, chondrosarcoma, Ewing sarcoma, multiple myeloma and metastatic tumors.', '<b>Definition:</b> A malignant mesenchymal tumor in which tumor cells directly produce osteoid or immature bone.', '<b>Clinical:</b> Most common primary malignant bone tumor in adolescents. Usually metaphysis of long bones around knee (distal femur/proximal tibia); pain, swelling and reduced movement. Secondary tumors in older adults may follow Paget disease, radiation or infarct.', '<b>Radiology:</b> Mixed lytic/sclerotic destructive metaphyseal mass, cortical breach, <b>sunburst</b> periosteal reaction and <b>Codman triangle</b>.', '<b>Gross/microscopy:</b> Bulky gritty gray-white hemorrhagic mass destroying cortex and extending into soft tissue. Pleomorphic malignant osteoblasts, atypical mitoses and lace-like malignant osteoid are diagnostic.', '<b>Spread:</b> Hematogenous, especially to lungs.']) H('8. Osteomyelitis',2) bullets(['<b>Definition:</b> Infection of bone and marrow. S. aureus is the usual organism; Salmonella is classically associated with sickle-cell disease.', '<b>Routes:</b> Hematogenous spread (children, metaphysis of long bones); direct implantation after trauma/surgery; spread from contiguous focus, particularly in diabetes.', '<b>Acute morphology:</b> Suppurative inflammation in marrow spreads through Haversian systems to cortex/periosteum. Ischemic bone necrosis creates a <b>sequestrum</b>; new periosteal bone surrounding it is <b>involucrum</b>; drainage tract is a cloaca.', '<b>Chronic disease:</b> Fibrosis, chronic inflammation, sequestra and sinus formation. Long-standing draining sinus can develop squamous cell carcinoma.']) H('9. Healing of fractures',2) bullets(['<b>1. Hematoma/inflammation:</b> Ruptured vessels form clot; neutrophils/macrophages remove debris.', '<b>2. Soft callus:</b> Granulation tissue, fibroblasts and chondroblasts bridge fracture.', '<b>3. Hard callus:</b> Woven bone formed by endochondral and intramembranous ossification unites fragments.', '<b>4. Remodeling:</b> Woven bone becomes lamellar bone; medullary cavity and shape are restored.', '<b>Factors delaying healing:</b> Infection, poor blood supply, severe displacement/gap, inadequate immobilization, interposed soft tissue, malnutrition and systemic disease. Complications: delayed union, non-union, malunion, avascular necrosis.']) story.append(PageBreak()) H('5-MARK QUESTIONS') P('Aim for a definition plus a focused list. Where “morphology” is asked, include gross and microscopic points.') H('Respiratory pathology',2) H('Lobar pneumonia',2) bullets(['Acute bacterial pneumonia involving a large part or whole lobe, classically caused by S. pneumoniae.', '<b>Stages:</b> Congestion (heavy red wet lung; vascular engorgement, edema, few neutrophils); red hepatization (firm red liver-like lung, alveoli filled with RBCs, neutrophils, fibrin); gray hepatization (RBC breakdown, fibrinopurulent exudate persists); resolution (enzymatic digestion and macrophage clearance).', '<b>Complications:</b> Abscess, empyema, organization/carnification, bacteremia with meningitis/endocarditis/arthritis.']) H('Chronic venous congestion of lung (CVC lung)',2) bullets(['Usually due to left-sided heart failure or mitral stenosis.', 'Gross: heavy, firm, brown lung. Microscopy: congested capillaries, interstitial edema, intra-alveolar hemorrhage and hemosiderin-laden macrophages (“heart-failure cells”).', 'Long-standing cases show septal fibrosis, termed brown induration. Clinical effects include dyspnea and hemoptysis.']) H('Types of emphysema',2) table([['Type','Distribution / association'],['Centriacinar','Central/proximal acini, upper lobes; smokers; often with chronic bronchitis.'],['Panacinar','Entire acinus uniformly enlarged, lower lobes; alpha-1 antitrypsin deficiency.'],['Distal acinar (paraseptal)','Distal acinus near pleura/septa; subpleural bullae; spontaneous pneumothorax in young adults.'],['Irregular','Irregular acinar involvement with scarring; often incidental.']], [4*cm,12.5*cm]) H('Ghon complex',2) bullets(['Primary tuberculosis lesion: a subpleural <b>Ghon focus</b> (usually lower part of upper lobe or upper part of lower lobe) plus ipsilateral hilar lymph-node involvement.', 'Healed lesions may calcify, becoming a Ranke complex.']) H('Cardiovascular pathology',2) H('Atherosclerosis',2) bullets(['Chronic intimal plaque disease of large/medium arteries.', 'Risk factors: hyperlipidemia, hypertension, smoking, diabetes, age, male sex and family history.', 'Plaque has fibrous cap and necrotic lipid core; complications are stenosis, rupture with thrombosis, embolism and aneurysm.']) H('Infarction',2) bullets(['Ischemic necrosis caused by occlusion of arterial supply or impaired venous drainage.', 'White (anemic) infarcts: solid organs with end-arterial circulation, e.g., heart, kidney, spleen. Red (hemorrhagic): loose tissues, dual circulation, venous occlusion or reperfusion, e.g., lung/intestine.', 'Most show coagulative necrosis; brain shows liquefactive necrosis. Outcome: scar, organization, or cystic change in brain.']) H('Thrombosis',2) bullets(['Formation of a solid mass of blood constituents in the heart or vessels during life.', 'Virchow triad: endothelial injury, abnormal blood flow (stasis/turbulence), hypercoagulability.', 'Arterial thrombi are platelet/fibrin-rich and often over plaques; venous thrombi are RBC-rich and cause congestion/embolism.', 'Fates: propagation, embolization, dissolution, organization/recanalization.']) H('Fat embolism',2) bullets(['Fat globules enter circulation after fractures of long bones, soft-tissue trauma or burns.', '<b>Fat embolism syndrome</b> typically 24-72 hours later: respiratory distress/hypoxemia, neurologic symptoms and petechial rash; may have thrombocytopenia/anemia.', 'Mechanisms: mechanical obstruction plus toxic free-fatty-acid endothelial injury. Fat can be demonstrated with Oil Red O/Sudan stain on frozen sections.']) H('Congenital heart disease and Tetralogy of Fallot',2) bullets(['Congenital heart disease may produce left-to-right shunt (ASD, VSD, PDA), right-to-left cyanotic shunt or obstruction. Long-standing L-to-R shunt can cause pulmonary hypertension and Eisenmenger reversal.', '<b>TOF:</b> ventricular septal defect, overriding aorta, right ventricular outflow obstruction (pulmonary stenosis), and right ventricular hypertrophy. Severity of pulmonary obstruction determines cyanosis. Squatting raises systemic resistance and reduces R-to-L shunting.']) H('Laboratory diagnosis of MI',2) bullets(['<b>Cardiac troponin I/T:</b> most sensitive/specific; rise 3-4 h, peak ~24-48 h, remain elevated 7-10 days (T may persist longer).', '<b>CK-MB:</b> rises 3-6 h, peaks ~24 h, normalizes 48-72 h; useful for detecting reinfarction.', 'Myoglobin rises earliest (1-2 h) but is nonspecific. Diagnosis requires rise/fall of troponin with clinical/ECG evidence of ischemia.']) H('Hepatobiliary pathology',2) H('Alcoholic liver disease',2) bullets(['Spectrum: fatty liver, alcoholic hepatitis, cirrhosis.', 'Alcohol metabolism increases NADH, promoting triglyceride synthesis and impairing fatty-acid oxidation. Acetaldehyde is toxic and promotes inflammation/fibrosis.', 'Alcoholic hepatitis: ballooning, Mallory-Denk bodies, neutrophils and pericellular fibrosis. Advanced disease causes portal hypertension and HCC risk.']) H('Hepatitis',2) bullets(['Inflammatory liver injury caused by viruses, alcohol, drugs, autoimmune disease or metabolic disorders.', 'Acute viral hepatitis: hepatocyte ballooning, spotty necrosis/apoptotic Councilman bodies, portal mononuclear inflammation and cholestasis.', 'Chronic hepatitis: portal inflammation with interface hepatitis, fibrosis, bridging fibrosis and eventual cirrhosis.']) H('Cholecystitis',2) bullets(['Acute cholecystitis usually follows cystic-duct obstruction by gallstone; chemical injury and secondary infection cause inflammation.', 'Gross: enlarged tense gallbladder with thickened congested wall; mucosa may be ulcerated. Microscopy: acute neutrophilic inflammation; severe cases gangrene/perforation.', 'Chronic cholecystitis: fibrosis, wall thickening, mucosal outpouchings (Rokitansky-Aschoff sinuses), often with stones.']) H('Cholelithiasis',2) bullets(['Gallstones are cholesterol (majority) or pigment (black/brown) stones.', 'Cholesterol stones: supersaturation, nucleation and hypomotility. Black pigment stones associate with chronic hemolysis; brown stones with infection/stasis in biliary tree.', 'Complications: biliary colic, acute/chronic cholecystitis, choledocholithiasis, cholangitis, pancreatitis and gallstone ileus.']) H('Musculoskeletal pathology',2) H('Osteosarcoma',2) bullets(['Malignant osteoid-producing tumor, typically metaphysis around knee in adolescents.', 'Painful enlarging mass; X-ray shows sunburst pattern/Codman triangle.', 'Histology: malignant pleomorphic cells directly producing lace-like osteoid. Lung metastases are common.']) H('Tubercular osteomyelitis',2) bullets(['Usually hematogenous M. tuberculosis infection of vertebrae or metaphysis/epiphysis of long bones.', 'Granulomatous inflammation with caseous necrosis, epithelioid cells and Langhans giant cells. Cold abscess/sinus may occur.', 'Spinal disease (Pott disease) can cause vertebral collapse and neurologic compression.']) H('Tuberculous arthritis',2) bullets(['Chronic monoarthritis involving weight-bearing joints, commonly hip or knee.', 'Synovial granulomas cause effusion, pannus and progressive cartilage/bone destruction; may lead to fibrous or bony ankylosis.', 'Classical radiology: periarticular osteopenia, marginal erosions and gradual joint-space narrowing (Phemister triad).']) H('Osteoporosis',2) bullets(['Reduced bone mass with normal mineralization, causing fragility fractures.', 'Primary: postmenopausal estrogen deficiency, senile. Secondary: glucocorticoids, endocrine disease, immobilization, malabsorption.', 'Trabecular thinning and cortical porosity. Vertebral compression, hip and Colles fractures are typical.']) H('Osteomalacia and rickets',2) bullets(['Defective mineralization of osteoid due to vitamin D deficiency, phosphate loss or impaired metabolism. <b>Rickets</b> occurs before epiphyseal closure; <b>osteomalacia</b> in adults.', 'Rickets: widened growth plates, metaphyseal cupping/fraying and skeletal deformities. Osteomalacia: bone pain, weakness, pseudofractures.']) H('Endocrine and skin pathology',2) H('Diabetes mellitus',2) bullets(['Metabolic disorder with chronic hyperglycemia due to deficient insulin secretion, action, or both.', 'Type 1: autoimmune beta-cell destruction with absolute insulin deficiency. Type 2: insulin resistance plus progressive beta-cell dysfunction.', 'Pathology: islet amyloid in type 2; diffuse/nodular glomerulosclerosis, accelerated atherosclerosis, neuropathy and infections.']) H('Hashimoto thyroiditis',2) bullets(['Autoimmune destruction of thyroid, common in middle-aged women; anti-thyroid peroxidase and anti-thyroglobulin antibodies are typical.', 'Diffuse painless goiter progressing to hypothyroidism. Microscopy: dense lymphoid infiltrate with germinal centers, Hürthle-cell change and follicular atrophy.', 'Increased risk of extranodal marginal-zone B-cell lymphoma.']) H('Leprosy: classification and microscopy',2) bullets(['Chronic infection by M. leprae involving skin and peripheral nerves. Spectrum reflects host cell-mediated immunity.', '<b>Tuberculoid:</b> strong immunity; few well-defined anesthetic plaques, asymmetric nerve involvement; granulomas, few/absent bacilli.', '<b>Lepromatous:</b> poor immunity; diffuse symmetric lesions/nodules, leonine facies, widespread neuropathy; sheets of foamy macrophages packed with acid-fast bacilli.', 'Borderline forms lie between poles. Demonstrate bacilli using Fite-Faraco stain.']) story.append(PageBreak()) H('3-MARK RAPID RECALL') H('Respiratory',2) H('Ghon complex',2); bullets(['Primary subpleural lung focus plus ipsilateral hilar lymph-node involvement.', 'Usually heals by fibrosis/calcification; calcified lesion plus node is Ranke complex.']) H('CVC lung',2); bullets(['Left heart failure causes pulmonary venous congestion.', 'Brown induration: hemosiderin-laden macrophages, septal fibrosis and congestion.']) H('Types of emphysema',2); bullets(['Centriacinar, panacinar, distal acinar/paraseptal, irregular.', 'Smokers: centriacinar upper lobes. Alpha-1 antitrypsin deficiency: panacinar lower lobes.']) H('Cardiovascular',2) H('Virchow triad ★',2); bullets(['Endothelial injury.', 'Abnormal blood flow: stasis or turbulence.', 'Hypercoagulability: inherited or acquired.']) H('Types of embolism',2); bullets(['Thromboembolism (pulmonary/systemic), fat embolism, air/gas embolism, amniotic-fluid embolism, atheromatous/cholesterol embolism and septic/tumor emboli.']) H('Fate of thrombus',2); bullets(['Propagation, embolization, dissolution, organization and recanalization.']) H('Risk factors for atherosclerosis',2); bullets(['Major modifiable: hyperlipidemia, hypertension, smoking, diabetes.', 'Non-modifiable: age, male sex, family history/genetics.']) H('Congenital heart diseases',2); bullets(['Left-to-right shunts: ASD, VSD, PDA.', 'Right-to-left shunts: TOF, transposition of great arteries, truncus arteriosus, tricuspid atresia.', 'Obstructive lesions: coarctation of aorta, pulmonary/aortic stenosis.']) H('Tetralogy of Fallot',2); bullets(['VSD, overriding aorta, pulmonary stenosis/RV outflow obstruction, RV hypertrophy.', 'Cyanosis depends on obstruction severity; squatting improves symptoms.']) H('Laboratory diagnosis of MI',2); bullets(['Troponin I/T: best sensitivity/specificity, persists 7-10 days or longer.', 'CK-MB normalizes in 2-3 days and helps detect reinfarction.', 'Myoglobin rises early but is nonspecific.']) H('Hepatobiliary',2) H('Types of cirrhosis',2); bullets(['Morphologic: micronodular, macronodular, mixed.', 'Etiologic: alcoholic, post-hepatitic, biliary, metabolic/genetic, cardiac.']) H('Jaundice',2); bullets(['Yellow discoloration due to increased bilirubin.', 'Prehepatic: unconjugated hyperbilirubinemia/hemolysis. Hepatic: impaired uptake, conjugation or excretion. Posthepatic: obstructive conjugated hyperbilirubinemia.']) H('Wilson disease ★',2); bullets(['Autosomal recessive ATP7B defect causes impaired copper excretion into bile and impaired ceruloplasmin incorporation.', 'Copper deposition causes hepatitis/cirrhosis, neuropsychiatric features, Kayser-Fleischer rings and Coombs-negative hemolysis.']) H('Risk factors for HCC',2); bullets(['Chronic HBV/HCV, cirrhosis of any cause, alcohol-associated liver disease, metabolic steatotic liver disease, aflatoxin exposure, hemochromatosis and tyrosinemia.']) H('CVC liver',2); bullets(['Due to right-sided heart failure/constrictive pericarditis.', '“Nutmeg liver”: centrilobular congestion/necrosis with fatty change in periportal hepatocytes.', 'Chronic severe disease produces cardiac cirrhosis.']) H('Musculoskeletal',2) H('Rickets ★',2); bullets(['Defective mineralization at growth plate due to vitamin D deficiency or phosphate disorders.', 'Features: craniotabes, rachitic rosary, Harrison sulcus, bowed legs/knock knees, widened wrists.', 'X-ray: cupping, fraying and splaying of metaphyses.']) H('Skeletal changes in rickets',2); bullets(['Skull: frontal bossing/craniotabes. Chest: rachitic rosary and pigeon chest. Limbs: bowed legs, widened wrists/ankles. Spine/pelvis may deform.']) H('Vitamin D deficiency',2); bullets(['Poor sun exposure, low intake, malabsorption, liver/kidney disease and increased requirement are causes.', 'Leads to hypocalcemia/hypophosphatemia, secondary hyperparathyroidism and defective mineralization.']) H('Osteoporosis',2); bullets(['Low bone mass with normal mineralization.', 'Postmenopausal, senile or secondary. Causes vertebral, hip and distal-radius fractures.']) H('Osteoarthritis',2); bullets(['Degenerative joint disease with progressive articular-cartilage loss.', 'Pain worsens with use, brief morning stiffness, crepitus and reduced motion.', 'Cartilage fibrillation, subchondral sclerosis/cysts and osteophytes.']) H('Gout versus pseudogout',2) table([['Feature','Gout','Pseudogout'],['Crystal','Monosodium urate','Calcium pyrophosphate'],['Shape/birefringence','Needle; strong negative','Rhomboid; weak positive'],['Common site','First MTP','Knee/wrist'],['Association','Hyperuricemia','Aging, hemochromatosis, hyperparathyroidism']], [3.5*cm,6.5*cm,6.5*cm]) H('Volkmann ischemic contracture',2); bullets(['Permanent flexion contracture after ischemic necrosis of forearm flexor muscles, usually following compartment syndrome/supracondylar fracture.', 'Muscle necrosis heals by fibrosis and shortening; early recognition and fasciotomy prevent it.']) H('Endocrine',2) H('Complications of diabetes mellitus ★★★',2); bullets(['<b>Acute:</b> diabetic ketoacidosis, hyperosmolar hyperglycemic state, hypoglycemia.', '<b>Macrovascular:</b> accelerated atherosclerosis causing MI, stroke and peripheral arterial disease.', '<b>Microvascular:</b> retinopathy, nephropathy and neuropathy.', '<b>Other:</b> infections, poor wound healing, diabetic foot, cataract.']) H('Secondary causes of diabetes',2); bullets(['Pancreatic destruction: chronic pancreatitis, pancreatectomy, hemochromatosis.', 'Endocrine excess: Cushing syndrome, acromegaly, pheochromocytoma, glucagonoma, hyperthyroidism.', 'Drugs: glucocorticoids, thiazides and some antipsychotics.']) H('Hyperparathyroidism',2); bullets(['Primary: adenoma, hyperplasia or rarely carcinoma, causing hypercalcemia.', 'Secondary: chronic kidney disease/vitamin D deficiency, causing compensatory PTH elevation.', 'Skeletal effect: osteitis fibrosa cystica with subperiosteal resorption and “brown tumors.”']) H('Dermatopathology',2) H('Leprosy',2); bullets(['M. leprae infection of skin/peripheral nerves.', 'Cardinal features: anesthetic hypopigmented/reddish patch, thickened peripheral nerve with sensory loss, acid-fast bacilli in smear.', 'Tuberculoid form has few bacilli; lepromatous form has numerous bacilli and diffuse lesions.']) H('Squamous cell carcinoma: morphology/microscopy',2); bullets(['Malignant tumor of squamous epithelium, common on sun-exposed skin; risks include UV exposure, chronic ulcers/sinuses, arsenic and HPV in some sites.', 'Gross: scaly indurated plaque/nodule or ulcer with everted edges.', 'Microscopy: invasive nests/cords of atypical squamous cells, keratin pearls and intercellular bridges; degree of keratinization indicates differentiation.']) H('Syphilis',2); bullets(['Treponema pallidum infection. Primary: painless chancre with regional lymphadenopathy.', 'Secondary: generalized rash including palms/soles, mucous patches, condylomata lata.', 'Tertiary: gummas, aortitis and neurosyphilis. Congenital disease: snuffles, Hutchinson teeth and other stigmata.']) H('Last-minute scoring checklist',2) bullets(['For a <b>morphology</b> answer, give <b>gross + microscopy</b>.', 'For a <b>pathogenesis</b> answer, write arrows: trigger -> mechanism -> structural change -> consequence.', 'Underline diagnostic words: Aschoff body, Anitschkow cell, heart-failure cell, sequestrum, involucrum, malignant osteoid, Mallory-Denk body, fish-mouth valve.', 'For comparisons, draw a 3-column table. For long answers, use numbered headings rather than paragraphs.']) P('Content is a high-yield educational summary, not a substitute for a standard pathology textbook or clinical guidance.', 'Tiny') def footer(canvas, doc): canvas.saveState(); canvas.setStrokeColor(colors.HexColor('#8B1E3F')); canvas.setLineWidth(.5); canvas.line(doc.leftMargin, 1.25*cm, A4[0]-doc.rightMargin, 1.25*cm) canvas.setFont('Helvetica',8); canvas.setFillColor(colors.HexColor('#666666')); canvas.drawString(doc.leftMargin, .85*cm, 'High-Yield Pathology Revision') canvas.drawRightString(A4[0]-doc.rightMargin,.85*cm, f'Page {doc.page}') canvas.restoreState() doc=SimpleDocTemplate(OUT,pagesize=A4,leftMargin=1.45*cm,rightMargin=1.45*cm,topMargin=1.35*cm,bottomMargin=1.55*cm,title='High-Yield Pathology Revision') doc.build(story,onFirstPage=footer,onLaterPages=footer) print(OUT) ''') PY python "/tmp/workspace/pathology-revision/src/create_pdf.py" python - <<'PY' from pypdf import PdfReader p='/tmp/workspace/pathology-revision/output/High_Yield_Pathology_Revision.pdf' r=PdfReader(p) print('pages',len(r.pages),'size',__import__('os').path.getsize(p)) print('page1',r.pages[0].extract_text()[:140]) print('last',r.pages[-1].extract_text()[-200:]) PY

python - <<'PY' import fitz p='/tmp/workspace/pathology-revision/output/High_Yield_Pathology_Revision.pdf' doc=fitz.open(p) for idx in [0,1,10,11]: page=doc[idx] pix=page.get_pixmap(matrix=fitz.Matrix(1.2,1.2), alpha=False) pix.save(f'/tmp/workspace/pathology-revision/output/preview_{idx+1}.png') print('rendered',len(doc)) PY

python - <<'PY' from pypdf import PdfReader p='/tmp/workspace/pathology-revision/output/High_Yield_Pathology_Revision.pdf' r=PdfReader(p) for i,page in enumerate(r.pages,1): txt=page.extract_text() or '' print(i, len(txt), 'OK' if len(txt)>250 else 'SHORT') PY

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pathology educational diagram emphysema atherosclerosis cirrhosis osteosarcoma rickets labeled

pathology diagrams emphysema atherosclerosis cirrhosis osteosarcoma rickets educational illustrations

python - <<'PY' from pathlib import Path p=Path('/tmp/workspace/pathology-revision/src/add_visuals.py') p.write_text(r'''from reportlab.pdfgen import canvas from reportlab.lib.pagesizes import A4 from reportlab.lib import colors from reportlab.lib.units import cm from reportlab.pdfbase.pdfmetrics import stringWidth from pypdf import PdfReader, PdfWriter OUT='/tmp/workspace/pathology-revision/output/Pathology_Visuals.pdf' FINAL='/tmp/workspace/pathology-revision/output/High_Yield_Pathology_Revision_with_Diagrams.pdf' W,H=A4 mar=1.35*cm C=colors.HexColor('#8B1E3F'); NAVY=colors.HexColor('#23395B'); PALE=colors.HexColor('#F8FAFC'); BLUE=colors.HexColor('#EAF2F8'); GREEN=colors.HexColor('#E9F5EC'); ORANGE=colors.HexColor('#FFF2E0') def header(c,title,subtitle): c.setFillColor(C); c.rect(0,H-1.65*cm,W,1.65*cm,fill=1,stroke=0); c.setFillColor(colors.white); c.setFont('Helvetica-Bold',16); c.drawString(mar,H-1.05*cm,title); c.setFont('Helvetica',8.4); c.drawRightString(W-mar,H-1.03*cm,subtitle) def footer(c,n): c.setStrokeColor(C); c.line(mar,1.15*cm,W-mar,1.15*cm); c.setFillColor(colors.HexColor('#666')); c.setFont('Helvetica',8); c.drawString(mar,.75*cm,'High-Yield Pathology Revision | Visual Revision Sheets'); c.drawRightString(W-mar,.75*cm,'Visual page '+str(n)) def wrap(c,txt,x,y,maxw,font='Helvetica',size=9,lead=11,color=colors.black,center=False): c.setFont(font,size); c.setFillColor(color); words=txt.split(); lines=[]; line='' for z in words: t=(line+' '+z).strip() if stringWidth(t,font,size)<=maxw: line=t else: lines.append(line); line=z if line: lines.append(line) for line in lines: xx=x+(maxw-stringWidth(line,font,size))/2 if center else x c.drawString(xx,y,line); y-=lead return y def box(c,x,y,w,h,txt,fill=BLUE,stroke=NAVY,fs=9): c.setFillColor(fill); c.setStrokeColor(stroke); c.roundRect(x,y-h,w,h,6,fill=1,stroke=1) yy=y-13; wrap(c,txt,x+7,yy,w-14,'Helvetica-Bold',fs,fs+2,NAVY,True) def arrow(c,x1,y1,x2,y2): c.setStrokeColor(C); c.setFillColor(C); c.setLineWidth(1.4); c.line(x1,y1,x2,y2); import math a=math.atan2(y2-y1,x2-x1); l=7 pts=[(x2,y2),(x2-l*math.cos(a-.45),y2-l*math.sin(a-.45)),(x2-l*math.cos(a+.45),y2-l*math.sin(a+.45))] p=c.beginPath(); p.moveTo(*pts[0]); p.lineTo(*pts[1]); p.lineTo(*pts[2]); p.close(); c.drawPath(p,fill=1,stroke=0) def flow(c,items,y,fill=BLUE): x=mar; gap=.55*cm; total=W-2*mar; bw=(total-gap*(len(items)-1))/len(items) for i,t in enumerate(items): box(c,x+i*(bw+gap),y,bw,1.5*cm,t,fill) if i<len(items)-1: arrow(c,x+i*(bw+gap)+bw,y-.75*cm,x+(i+1)*(bw+gap),y-.75*cm) def section(c,title,y): c.setFillColor(C); c.setFont('Helvetica-Bold',12); c.drawString(mar,y,title); c.setStrokeColor(colors.HexColor('#D6A7B7')); c.line(mar,y-4,W-mar,y-4) c=canvas.Canvas(OUT,pagesize=A4) # 1 header(c,'VISUAL SHEET 1: RESPIRATORY + CARDIOVASCULAR','Draw these in 10-mark answers') section(c,'COPD PATHOGENESIS FLOWCHART',H-2.25*cm) flow(c,['Smoking / biomass fuel','Chronic airway inflammation','Protease excess + oxidative stress','Mucus plugging + alveolar-wall loss','Airflow limitation, air trapping, dyspnea'],H-2.7*cm) c.setFillColor(colors.HexColor('#555')); c.setFont('Helvetica-Oblique',8.5); c.drawString(mar,H-4.55*cm,'Exam label: small-airway fibrosis causes fixed obstruction; alveolar destruction causes loss of elastic recoil.') section(c,'EMPHYSEMA: ACINAR PATTERNS (schematic)',H-5.15*cm) # acini visual panels labels=[('NORMAL','uniform tiny alveoli'),('CENTRIACINAR','central acinus enlarged\n(smoker, upper lobe)'),('PANACINAR','whole acinus enlarged\nA1AT deficiency, lower lobe'),('PARASEPTAL','distal acinus near pleura\nbullae/pneumothorax')] x=mar; bw=4.3*cm; gap=.38*cm; yy=H-5.65*cm for i,(head,sub) in enumerate(labels): xx=x+i*(bw+gap); c.setFillColor(PALE); c.setStrokeColor(NAVY); c.roundRect(xx,yy-3.1*cm,bw,3.1*cm,6,fill=1,stroke=1); c.setFillColor(NAVY); c.setFont('Helvetica-Bold',8); c.drawCentredString(xx+bw/2,yy-13,head) # terminal bronchiole & alveoli cx=xx+bw/2; cy=yy-1.7*cm; c.setStrokeColor(NAVY); c.setLineWidth(2); c.line(cx,yy-32,cx,cy+8) for dx,dy,r in [(-26,5,10),(0,8,10),(26,5,10),(-22,-18,10),(0,-20,10),(22,-18,10)]: rr=r if i==1 and dy>0: rr=18 if i==2: rr=17 if i==3 and dx>15: rr=19 c.setFillColor(ORANGE if rr>10 else colors.white); c.circle(cx+dx,cy+dy,rr,fill=1,stroke=1) wrap(c,sub,xx+5,yy-2.65*cm,bw-10,'Helvetica',7.5,9,NAVY,True) section(c,'ATHEROSCLEROSIS: RESPONSE-TO-INJURY FLOWCHART',H-9.15*cm) flow(c,['Endothelial dysfunction','LDL enters intima and oxidizes','Monocyte recruitment -> foam cells','SMC migration + collagen deposition','Fibrous-cap plaque -> rupture/thrombosis'],H-9.6*cm,GREEN) c.setFont('Helvetica-Bold',9); c.setFillColor(NAVY); c.drawString(mar,H-11.42*cm,'Plaque anatomy:'); # plaque cross-section px=mar+3.2*cm; py=H-11.1*cm; pw=11.5*cm; ph=2.3*cm c.setFillColor(colors.HexColor('#D7A35D')); c.roundRect(px,py-ph,pw,ph,8,fill=1,stroke=1); c.setFillColor(colors.HexColor('#9B2D30')); c.rect(px,py-ph,pw,.48*cm,fill=1,stroke=0); c.setFillColor(colors.HexColor('#F7D57C')); c.ellipse(px+2*cm,py-1.9*cm,px+7.7*cm,py-.7*cm,fill=1,stroke=1); c.setFillColor(colors.HexColor('#E8EEF6')); c.roundRect(px+7.4*cm,py-1.75*cm,3.2*cm,.75*cm,10,fill=1,stroke=0) c.setFillColor(NAVY); c.setFont('Helvetica-Bold',8); c.drawString(px+.2*cm,py-.3*cm,'Fibrous cap'); c.drawString(px+3.2*cm,py-1.35*cm,'Lipid-necrotic core'); c.drawString(px+7.7*cm,py-1.35*cm,'Residual lumen'); c.setFont('Helvetica-Oblique',8); c.drawString(mar,H-14*cm,'Clinical consequences: progressive stenosis | plaque rupture/erosion -> thrombosis | embolization | aneurysm.') footer(c,1); c.showPage() # 2 header(c,'VISUAL SHEET 2: LIVER + BONE','High-yield sequence diagrams') section(c,'ALCOHOL-ASSOCIATED LIVER DISEASE PROGRESSION',H-2.25*cm) flow(c,['Alcohol excess\nraised NADH','Steatosis\nreversible','Alcoholic hepatitis\nballooning + Mallory-Denk bodies','Fibrosis\n“chicken-wire”','Cirrhosis -> portal hypertension / HCC'],H-2.72*cm,ORANGE) section(c,'CIRRHOSIS: PATHOGENESIS',H-4.7*cm) flow(c,['Chronic hepatocyte injury','Stellate-cell activation','Collagen deposition + bridging fibrosis','Regenerative nodules','Distorted liver architecture + portal hypertension'],H-5.16*cm,GREEN) c.setFillColor(colors.HexColor('#555')); c.setFont('Helvetica-Oblique',8.5); c.drawString(mar,H-6.95*cm,'Key complications to label: ascites, splenomegaly, varices, encephalopathy, coagulopathy and hepatocellular carcinoma.') section(c,'FRACTURE HEALING',H-7.5*cm) flow(c,['Fracture + hematoma','Inflammation and debris removal','Soft callus\nfibrocartilage','Hard callus\nwoven bone','Remodelling\nlamellar bone'],H-7.96*cm,BLUE) section(c,'OSTEOSARCOMA: EXAM DIAGRAM LABELS',H-10*cm) # bone diagram bx=mar+1*cm; by=H-10.55*cm c.setFillColor(colors.HexColor('#F7E8CF')); c.setStrokeColor(NAVY); c.roundRect(bx,by-3.1*cm,3.0*cm,3.1*cm,20,fill=1,stroke=1) c.setFillColor(colors.HexColor('#C98A6D')); c.circle(bx+2.55*cm,by-1.55*cm,.95*cm,fill=1,stroke=1) # rays c.setStrokeColor(C); c.setLineWidth(1.2) for a in range(0,360,24): import math x1=bx+2.55*cm+0.85*cm*math.cos(math.radians(a)); y1=by-1.55*cm+0.85*cm*math.sin(math.radians(a)); x2=bx+2.55*cm+1.35*cm*math.cos(math.radians(a)); y2=by-1.55*cm+1.35*cm*math.sin(math.radians(a)); c.line(x1,y1,x2,y2) # labels c.setFillColor(NAVY); c.setFont('Helvetica-Bold',9); c.drawString(bx+4.25*cm,by-.5*cm,'Metaphysis around knee'); c.drawString(bx+4.25*cm,by-1.2*cm,'Destructive osteoid-forming mass'); c.drawString(bx+4.25*cm,by-1.9*cm,'Sunburst periosteal reaction'); c.drawString(bx+4.25*cm,by-2.6*cm,'Codman triangle: lifted periosteum') for yy in [by-.6*cm,by-1.3*cm,by-2*cm,by-2.7*cm]: arrow(c,bx+4*cm,yy,bx+3.3*cm,yy) c.setFont('Helvetica-Oblique',8.5); c.setFillColor(colors.HexColor('#555')); c.drawString(mar,H-14.2*cm,'Microscopy scoring line: pleomorphic malignant cells directly producing lace-like osteoid.') footer(c,2); c.showPage() # 3 header(c,'VISUAL SHEET 3: ENDOCRINE + DERMATOPATHOLOGY','Rapid-revision flowcharts and comparison') section(c,'DIABETES MELLITUS: COMPLICATION MAP ★★★',H-2.25*cm) # central and branches box(c,W/2-2.2*cm,H-2.8*cm,4.4*cm,1.1*cm,'CHRONIC HYPERGLYCEMIA',ORANGE) items=[('Macrovascular','MI, stroke, PAD'),('Microvascular','Retinopathy, nephropathy, neuropathy'),('Other','Infections, poor healing, diabetic foot')] for i,(h,t) in enumerate(items): xx=mar+i*6.05*cm; box(c,xx,H-5.1*cm,5.25*cm,1.4*cm,h+'\n'+t,GREEN); arrow(c,W/2,H-3.9*cm,xx+2.6*cm,H-5.1*cm) c.setFillColor(NAVY); c.setFont('Helvetica-Bold',8.5); c.drawString(mar,H-6.85*cm,'Acute emergencies: diabetic ketoacidosis | hyperosmolar hyperglycemic state | hypoglycemia.') section(c,'LEPROSY SPECTRUM: TUBERCULOID VS LEPROMATOUS',H-7.35*cm) # comparison x=mar; y=H-7.83*cm; col=8.35*cm for i,(head,body,fill) in enumerate([('TUBERCULOID (high CMI)','Few well-defined anesthetic plaques\nAsymmetric nerve involvement\nGranulomas; scant/absent AFB',GREEN),('LEPROMATOUS (low CMI)','Diffuse symmetric lesions and nodules\nWidespread neuropathy; leonine facies\nFoamy macrophages packed with AFB',ORANGE)]): box(c,x+i*(col+.55*cm),y,col,3.0*cm,head+'\n\n'+body,fill,fs=9) c.setFillColor(C); c.setFont('Helvetica-Bold',9); c.drawCentredString(W/2,H-11.2*cm,'Borderline forms occupy the immunologic middle of this spectrum') section(c,'THROMBOSIS AND EMBOLISM: ONE-MINUTE FLOWCHART',H-11.8*cm) flow(c,['Virchow triad\ninjury + abnormal flow + hypercoagulability','Thrombus','Propagation / embolization / dissolution / organization','Pulmonary or systemic embolic complications'],H-12.25*cm,BLUE) footer(c,3); c.save() # merge original then visuals w=PdfWriter() for f in ['/tmp/workspace/pathology-revision/output/High_Yield_Pathology_Revision.pdf',OUT]: r=PdfReader(f) for page in r.pages: w.add_page(page) with open(FINAL,'wb') as fp: w.write(fp) print(FINAL) ''') PY python "/tmp/workspace/pathology-revision/src/add_visuals.py" python - <<'PY' from pypdf import PdfReader import os p='/tmp/workspace/pathology-revision/output/High_Yield_Pathology_Revision_with_Diagrams.pdf' r=PdfReader(p) print('pages',len(r.pages),'bytes',os.path.getsize(p)) for i in range(len(r.pages)-3,len(r.pages)): print(i+1,(r.pages[i].extract_text() or '')[:120].replace('\n',' | ')) PY