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TNMGR Pathology - 20-Day Study Plan (Systemic + Haematology First)

Paper Structure at TNMGR

• Paper V (Pathology I) - General Pathology + Haematology
• Paper VI (Pathology II) - Systemic Pathology

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PHASE 1: Days 1-10 (6 hrs/day) - Systemic Pathology + Haematology

SYSTEMIC PATHOLOGY - Priority Order (Paper VI)

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HAEMATOLOGY - Priority Order (Paper V)

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PHASE 2: Days 11-20 (Reduced hours) - General Pathology

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Most Repeated Essay Combinations at TNMGR (Pattern over 2008-2024)

• MI: zones of necrosis + enzymes + complications
• Carcinoma breast: types + spread + prognostic factors
• Hepatitis: morphology + lab diagnosis
• Cervical carcinoma: CIN + HPV + spread
• GN: nephrotic syndrome or MCD
• Lung carcinoma: bronchogenic types + paraneoplastic

• CML with Philadelphia chromosome
• Hodgkin's lymphoma (RS cell + classification)
• DIC - pathogenesis and lab findings
• Iron deficiency anaemia vs megaloblastic anaemia
• Multiple myeloma (CRAB + lab)

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Practical Tips for Your 20 Days

1. For each system in Robbins, don't read cover-to-cover - use the chapter structure: etiology → pathogenesis → morphology → clinical features → complications. That maps exactly to TNMGR essay format.
2. Morphology boxes in Robbins are gold - TNMGR short notes are often directly from those.
3. Supplement with Harsh Mohan for tables and quick revision after Robbins - his classification tables are easier to memorize for short notes.
4. Draw diagrams for: MI zones, Reed-Sternberg cell, glomerulonephritis mechanisms, Virchow's triad. Diagrams get full marks in practical/theory.
5. MCQs (20 marks in your paper) - practice from TNMGR previous papers specifically. The MCQ pattern repeats heavily.
6. For haematology, remember peripheral smear findings are frequently asked in both theory and practicals - practice describing smears for IDA, megaloblastic, CML, malaria.

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Combined Systemic + Haematology - Priority Order (TNMGR)

TIER 1 - Must Do First (Days 1-4)

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TIER 2 - High Yield (Days 4-7)

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TIER 3 - Important (Days 7-9)

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TIER 4 - Finish These Last (Day 9-10)

• Hepatocellular carcinoma (AFP, cirrhosis association)
• COPD (emphysema vs chronic bronchitis - Reid index)
• Melanoma (Clark levels, Breslow thickness, ABCDE)
• Endometrial carcinoma (Type 1 vs Type 2)
• Blood banking - ABO/Rh, transfusion reactions (TRALI, TACO, febrile)
• Aplastic vs myelophthisic anaemia

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How to Use This During Your 6-Hour Days

• Hours 1-2: Read Robbins (new topic) - focus on pathogenesis + morphology only
• Hours 3-4: Second topic reading
• Hour 5: Write short notes from memory for both topics (this is your exam practice)
• Hour 6: Previous year TNMGR questions on those topics - answer at least 2

Haematology - Important Topics for TNMGR (Ranked by Weightage)

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MUST-DO (Essay level - highest marks)

1. Leukaemias

• CML - Philadelphia chromosome, BCR-ABL, peripheral smear (myelocyte bulge), LAP score low
• AML - FAB classification (M0-M7), Auer rods, M3 (APML) + DIC link
• ALL - most common childhood malignancy, TdT positive, L1/L2/L3
• CLL - smudge cells, CD5+, Richter transformation

2. Lymphomas

• Hodgkin's Lymphoma - Reed-Sternberg cell (owl eye), 4 subtypes (Nodular Sclerosis most common), EBV link, Ann Arbor staging
• Non-Hodgkin's Lymphoma - Diffuse Large B-Cell most common, Burkitt's (t8;14, starry sky), Follicular (t14;18, bcl-2)

3. Anaemias - IDA vs Megaloblastic

• IDA: microcytic hypochromic, low serum ferritin, high TIBC, peripheral smear (pencil cells, target cells)
• Megaloblastic: B12 vs Folate deficiency, hypersegmented neutrophils, macro-ovalocytes, Schilling test concept
• Know the comparison table cold - it comes as a compare/contrast essay

4. DIC

• Pathogenesis (tissue factor → thrombin → fibrin → microthrombi → consumption)
• Lab: PT↑, APTT↑, platelets↓, fibrinogen↓, D-dimer↑, FDP↑
• Causes: sepsis, obstetric emergencies, AML-M3, snake bite
• This is a near-certain essay or long short note every year

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HIGH YIELD (Long short notes or alternate essays)

5. Multiple Myeloma

• CRAB criteria (Calcium↑, Renal failure, Anaemia, Bone lytic lesions)
• Bence Jones protein, M-band on electrophoresis (IgG most common)
• Rouleaux formation on peripheral smear
• Bone marrow: plasma cells >10%

6. Hemolytic Anaemias

• Sickle cell disease - HbS, vaso-occlusion, sickle cells on smear, crises types
• Thalassemia - alpha vs beta, target cells, HbA2 raised in beta thal minor
• G6PD deficiency - Heinz bodies, triggered by drugs/infection
• Classification: intravascular vs extravascular hemolysis

7. Aplastic Anaemia

• Causes (benzene, chloramphenicol, radiation, autoimmune)
• Pancytopenia, hypocellular bone marrow (fat replacement)
• Bone marrow biopsy is diagnostic (not aspiration)

8. ITP (Immune Thrombocytopenic Purpura)

• Autoantibody against GPIIb/IIIa (PAIgG)
• Increased megakaryocytes in bone marrow
• Platelet count low, normal PT and APTT (pure platelet disorder)
• Distinguish from TTP (MAHA + thrombocytopenia + neuro + renal + fever)

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IMPORTANT SHORT NOTES (5-mark questions)

9. Myeloproliferative Neoplasms

• Polycythemia Vera (JAK2 mutation, raised RBC mass, low EPO)
• Essential Thrombocythemia
• Primary Myelofibrosis (teardrop cells, leukoerythroblastic picture)
• All share JAK2 V617F mutation except CML (which has BCR-ABL)

10. Blood Banking + Transfusion

• ABO system (O = universal donor, AB = universal recipient)
• Rh system - HDN (hemolytic disease of newborn), anti-D prophylaxis
• Transfusion reactions:
  • Febrile non-hemolytic (most common)
  • Acute hemolytic (ABO incompatibility - most dangerous, intravascular)
  • TRALI (transfusion-related acute lung injury)
  • TACO (transfusion-associated circulatory overload)
• Coombs test - direct vs indirect

11. Lymph Node + Spleen

• Reactive lymphadenitis vs granulomatous (TB) vs neoplastic
• Splenomegaly causes and consequences (hypersplenism)

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Peripheral Smear Findings - Know These Cold

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Quick Summary - Study Order for Haematology

1. Leukaemias (ALL 4 types together)
2. Lymphomas (HL + NHL together)
3. Anaemias (IDA + Megaloblastic + Hemolytic as one block)
4. DIC
5. Multiple Myeloma
6. Aplastic Anaemia + ITP
7. MPNs (Polycythemia Vera focus)
8. Blood Banking + Transfusion reactions
9. Peripheral smear revision

Systemic Pathology - Important Topics for TNMGR (Ranked by Weightage)

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MUST-DO (Essay level - highest marks)

1. Cardiovascular System

• Zones: coagulative necrosis, zone of injury, zone of ischemia
• Timeline of changes (0-24 hrs to weeks) - gross + micro at each stage
• Enzymes: Troponin I/T (most specific), CK-MB, LDH
• Complications: arrhythmia, cardiac rupture, aneurysm, Dressler syndrome, mural thrombus
• Types: STEMI vs NSTEMI; transmural vs subendocardial

• Response to injury hypothesis, role of LDL, foam cells, fatty streak → fibrous plaque → complicated plaque
• Complications: stenosis, thrombosis, aneurysm, embolism

• Strep pharyngitis → molecular mimicry → Aschoff body (pathognomonic)
• Mitral stenosis (most common valve), fish mouth/button hole deformity
• McCallum's patch

• Acute (S. aureus, normal valve) vs Subacute (Strep viridans, abnormal valve)
• Vegetations: friable, irregular, on line of closure
• Janeway lesions, Osler nodes, Roth spots, splinter hemorrhages

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2. Respiratory System

• Types: Squamous cell (central, Keratin pearls, cavitates), Adenocarcinoma (peripheral, most common now, lepidic pattern), Small cell (central, neuroendocrine, paraneoplastic - SIADH/Cushing's, very aggressive), Large cell
• Pancoast tumor (apex → Horner's + brachial plexus)
• Paraneoplastic syndromes: PTHrP (SCC → hypercalcemia), SIADH (SCLC), ACTH (SCLC → Cushing's), Lambert-Eaton (SCLC)
• Staging matters for treatment - know TNM basics

• Lobar pneumonia: 4 stages - congestion, red hepatization, grey hepatization, resolution
• Bronchopneumonia: patchy, lower lobes, elderly/immunocompromised
• Atypical (Mycoplasma, Legionella, viral) - interstitial pattern

• Emphysema: centriacinar (smoking) vs panacinar (alpha-1 antitrypsin deficiency); destruction of alveolar walls, barrel chest
• Chronic bronchitis: Reid index >0.5 (mucous gland hypertrophy), productive cough >3 months x 2 years
• Blue bloater vs pink puffer

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3. Liver, Biliary Tract, Pancreas

• HAV/HEV: feco-oral, self-limiting, no chronicity (HEV dangerous in pregnancy)
• HBV: serology (HBsAg, HBeAg, anti-HBc IgM = window period), ground glass hepatocytes, Dane particle
• HCV: most likely to become chronic (70%), most common cause of cirrhosis in developed world
• Morphology: ballooning degeneration, Councilman (acidophil) bodies, lobular disarray, piecemeal necrosis

• Definition: irreversible, diffuse fibrosis + nodule formation
• Types: micronodular (alcoholic, <3mm) vs macronodular (post-viral, >3mm)
• Complications: portal hypertension → varices, splenomegaly, ascites; hepatic encephalopathy; HCC (most important complication)
• Alcoholic liver disease progression: fatty change → hepatitis (Mallory hyaline) → cirrhosis

• Acute: fat necrosis (calcium soap deposits), hemorrhagic necrosis, APACHE score
• Chronic: calcification, exocrine failure, pseudocysts
• Carcinoma pancreas: head (obstructive jaundice + Courvoisier sign), body/tail (silent), CA 19-9

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4. Gastrointestinal Tract

• Lauren classification: Intestinal type (well-differentiated, better prognosis, H. pylori linked) vs Diffuse type (signet ring cells, linitis plastica, worse prognosis)
• Spread: direct, lymph nodes (Virchow's node - left supraclavicular), Krukenberg tumor (ovarian metastasis), Sister Mary Joseph nodule (umbilical)
• Location: pyloric antrum most common

• H. pylori mechanism (urease → ammonia → mucosal damage)
• Duodenal ulcer (more common, first part, anterior wall perforates, posterior wall bleeds) vs Gastric ulcer
• Complications: perforation, hemorrhage, penetration, obstruction, malignant transformation (gastric only)

• Adenoma-carcinoma sequence (APC mutation → FAP)
• HNPCC (Lynch syndrome) - microsatellite instability, MLH1/MSH2
• Left side: annular, obstruction; Right side: polypoid, bleeding, anemia
• Duke's staging (A/B/C/D) - still asked in TNMGR

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5. Kidney

• Minimal Change Disease (MCD): most common nephrotic in children; effacement of podocyte foot processes on EM; responds to steroids
• IgA Nephropathy (Berger's disease): most common GN worldwide; mesangial IgA deposits; hematuria after URI
• PSGN: after Group A Strep skin/throat infection; subepithelial humps on EM; low C3
• MPGN: tram-track appearance (double contour basement membrane)
• RPGN: crescents in Bowman's space (parietal epithelial cell proliferation)

• RCC (clear cell most common): from proximal tubule; triad = hematuria + flank pain + mass; paraneoplastic (EPO → polycythemia, PTHrP, Cushing's); yellow cut surface
• Wilms Tumor (Nephroblastoma): most common renal tumor in children <5 years; triphasic (blastemal + stromal + epithelial); WT1 gene
• TCC (Transitional Cell Carcinoma): pelvis/ureter/bladder; smoking + aniline dyes risk factor

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HIGH YIELD (Long short notes or alternate essays)

6. Breast

• Most common cancer in women worldwide
• Invasive Ductal Carcinoma NOS (most common, 70-80%), Invasive Lobular (E-cadherin loss, Indian file pattern)
• Grading: Nottingham/Bloom-Richardson (tubule formation + nuclear grade + mitosis)
• Receptors: ER/PR positive = better prognosis; HER2 positive = aggressive but treatable (Herceptin)
• Spread: axillary LN most common; bone (osteolytic), lung, liver, brain
• Paget's disease of nipple (intraepidermal spread of ductal carcinoma)
• Fibroadenoma: most common benign tumor, young women, "breast mouse"
• Fibrocystic change: most common breast lesion overall; only atypical hyperplasia increases cancer risk

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7. Thyroid

• Papillary carcinoma (most common, 80%): ground glass/Orphan Annie nuclei, nuclear grooves, psammoma bodies, RET/PTC rearrangement, excellent prognosis, spreads to lymph nodes
• Follicular carcinoma: capsular/vascular invasion (not FNA diagnosis), hematogenous spread to bone/lung, RAS mutation
• Medullary carcinoma: from C-cells, secretes calcitonin, amyloid stroma, RET mutation, associated with MEN 2A/2B
• Anaplastic: most aggressive, elderly, rapid death
• Hashimoto's thyroiditis: autoimmune (anti-TPO, anti-Tg), Hurthle cell change, germinal centers in thyroid; hypothyroid; risk of lymphoma
• Graves disease: TSI antibodies, diffuse hyperplasia, exophthalmos, pretibial myxedema

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8. Female Reproductive

• HPV 16 (SCC) and HPV 18 (adenocarcinoma) - high risk types
• CIN 1 (mild dysplasia) → CIN 2 (moderate) → CIN 3/CIS (severe/full thickness)
• Koilocytes (HPV cytopathic effect)
• Squamocolumnar junction (transformation zone) is the site
• Spread: direct to parametrium, bladder, rectum; lymph nodes
• Pap smear for screening

• Type 1 (endometrioid, estrogen-driven, better prognosis, younger, obese, PCOS link, PTEN mutation)
• Type 2 (serous/clear cell, not estrogen-driven, worse prognosis, older, TP53 mutation)

• Surface epithelial (most common, 65-70%): Serous (psammoma bodies, bilateral), Mucinous (large, multiloculated, pseudomyxoma peritonei), Endometrioid, Clear cell, Brenner (coffee bean nuclei)
• Germ cell: Dysgerminoma (equivalent of seminoma), Teratoma (mature = dermoid cyst), Yolk sac tumor (AFP↑, Schiller-Duval bodies)
• Sex cord stromal: Granulosa cell tumor (Call-Exner bodies, estrogen-secreting → endometrial hyperplasia), Thecoma, Sertoli-Leydig (virilization)
• Krukenberg tumor = bilateral ovarian mets from GIT (signet ring cells)

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9. Male Reproductive

• Most common cancer in elderly males; posterior zone (peripheral zone); Gleason grading (1-5 per pattern, score = primary + secondary, max 10)
• PSA elevated (also elevated in BPH and prostatitis - not specific)
• Spread: bone (osteoblastic - sclerotic) - distinguishes from other cancers
• BPH: median/lateral lobes, transitional zone; nodular hyperplasia; urinary outflow obstruction

• Seminoma: most common, radiosensitive, LDH/PLAP elevated, uniform cells
• Non-seminomatous: Embryonal (AFP+), Choriocarcinoma (hCG+, most aggressive), Yolk sac (children, AFP+)

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10. CNS

• GBM (Grade IV): most common malignant primary brain tumor in adults; pseudopalisading necrosis; EGFR/PTEN mutations; butterfly pattern (crosses corpus callosum)
• Meningioma: from arachnoid cap cells; psammoma bodies; benign, slow-growing; falx cerebri most common site
• Medulloblastoma: most common brain tumor in children; posterior fossa (cerebellum); Homer-Wright rosettes; PNET; radiosensitive
• Ependymoma: 4th ventricle; perivascular pseudorosettes

• Know CSF findings cold:

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11. Bone and Soft Tissue

• Osteosarcoma: most common primary malignant bone tumor; distal femur/proximal tibia; Codman's triangle + sunray/sunburst pattern on X-ray; peak age 10-20 years
• Ewing's Sarcoma: diaphysis of long bones; onion skin periosteal reaction; t(11;22), EWS-FLI1; small round blue cell tumor; peak age 5-15 years
• Giant Cell Tumor (Osteoclastoma): epiphysis, around knee; soap bubble appearance; locally aggressive; multinucleated giant cells
• Chondrosarcoma: adults, slow-growing, chemo-resistant

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12. Skin

• Melanoma: from melanocytes; ABCDE criteria; Clark levels (I-V, depth of invasion) + Breslow thickness (actual mm, more prognostic); BRAF V600E mutation; spreads hematogenously
• Basal Cell Carcinoma (BCC): most common skin cancer; locally invasive, rarely metastasizes; rodent ulcer; palisading basal cells; sun-exposed areas
• Squamous Cell Carcinoma (SCC): keratin pearls; arises from actinic keratosis (precursor); can metastasize
• Psoriasis + Pemphigus: frequently asked as short notes (Munro microabscesses in psoriasis; acantholysis in pemphigus)

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Quick Summary - Study Order for Systemic Pathology

1. CVS (Cardiovascular System)
2. Respiratory System

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CHAPTER 1 - RESPIRATORY SYSTEM

ESSAYS (15-mark questions)

Essay 1 - Bronchogenic Carcinoma ⭐⭐⭐

• Definition + classification (WHO: Squamous, Adeno, Small cell, Large cell)
• Squamous cell carcinoma:
  • Central location, arises from bronchial epithelium
  • Gross: cavitating mass near hilum
  • Micro: keratin pearls, intercellular bridges
  • Paraneoplastic: PTHrP → hypercalcemia
• Adenocarcinoma:
  • Peripheral, most common type now
  • Lepidic growth pattern (along alveolar walls)
  • EGFR, KRAS, ALK mutations (targeted therapy)
  • Clara cells/type II pneumocytes origin
• Small cell carcinoma:
  • Central, neuroendocrine origin
  • Micro: oat-shaped cells, salt and pepper chromatin, no nucleoli
  • Most aggressive, paraneoplastic: SIADH (hyponatremia), Cushing's (ACTH), Lambert-Eaton myasthenic syndrome
  • Never operated - chemotherapy only
• Large cell carcinoma:
  • Peripheral, diagnosis of exclusion
  • Undifferentiated, worst prognosis among non-SCLC
• Pancoast tumor (superior sulcus): Horner's syndrome + brachial plexus involvement
• Spread: direct, lymph nodes (hilar, mediastinal), hematogenous (liver, brain, adrenal, bone)
• Staging: TNM briefly

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Essay 2 - Pneumonia ⭐⭐

• Lobar pneumonia:
  • Organism: S. pneumoniae (90%)
  • Entire lobe consolidated
  • 4 stages:
    • Congestion (1-2 days): vascular congestion, edema fluid, few bacteria
    • Red hepatization (2-4 days): RBCs + fibrin + neutrophils; liver-like consistency
    • Grey hepatization (4-6 days): RBCs lysed, fibrin + macrophages; grey appearance
    • Resolution (after day 8): enzymatic digestion of exudate, macrophage clearance
  • Complications: empyema, lung abscess, bacteremia, fibrous organization
• Bronchopneumonia:
  • Organisms: Staphylococcus, Klebsiella, H. influenzae, mixed
  • Patchy consolidation, bilateral, lower lobes predominant
  • Multiple foci around bronchioles
  • Common in extremes of age, post-operative, immunocompromised
• Comparison table (write this in exam):

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SHORT NOTES (5-mark questions)

1. Lung Abscess ⭐⭐

• Localised suppurative necrosis of lung parenchyma
• Causes: aspiration (most common, right lower lobe), pneumonia complication, septic emboli, direct spread
• Gross: cavity with necrotic centre, foul-smelling pus
• Micro: neutrophilic exudate, surrounding fibrosis in chronic cases
• Complications: bronchiectasis, empyema, brain abscess (hematogenous), amyloidosis (chronic)

2. COPD - Emphysema ⭐⭐

• Permanent enlargement of airspaces distal to terminal bronchiole with destruction of walls
• Centriacinar (centrilobular): smoking, upper lobes, respiratory bronchioles affected
• Panacinar: alpha-1 antitrypsin deficiency, lower lobes, entire acinus
• Paraseptal: near pleura, can cause spontaneous pneumothorax
• Pathogenesis: protease-antiprotease imbalance (elastase from neutrophils destroys elastin)
• Pink puffer: thin, pursed lip breathing, barrel chest, hyperresonance
• Micro: enlarged airspaces, thin walls, loss of elastic tissue

3. Chronic Bronchitis ⭐⭐

• Clinical definition: productive cough ≥3 months/year for ≥2 consecutive years
• Pathology: Reid index >0.5 (mucous gland layer/bronchial wall thickness)
• Goblet cell hyperplasia extending into bronchioles
• Blue bloater: cyanosed, edematous, hypoxic, hypercapnic

4. Bronchiectasis ⭐

• Permanent abnormal dilatation of bronchi
• Causes: obstruction, infection (TB, pertussis), CF, Kartagener syndrome
• Types: cylindrical, varicose, saccular/cystic
• "Tram-track" sign on CXR; lower lobe predominant
• Complications: recurrent pneumonia, lung abscess, cor pulmonale, amyloidosis

5. Mesothelioma ⭐⭐

• Malignant tumor of pleura (also peritoneum, pericardium)
• Strongly associated with asbestosis (amphibole fibers - crocidolite most dangerous)
• Long latency period (20-40 years after exposure)
• Gross: thick rind encasing the lung
• Micro: biphasic pattern (epithelioid + sarcomatoid); positive for calretinin, CK5/6, WT1
• Poor prognosis; distinguish from adenocarcinoma (CEA negative, calretinin positive)

6. Sarcoidosis ⭐⭐

• Multisystem granulomatous disease of unknown cause
• Non-caseating granulomas (unlike TB which has caseation)
• Lung: bilateral hilar lymphadenopathy (BHL) on CXR
• Schaumann bodies (calcium/protein inclusions) and asteroid bodies inside granulomas
• ACE (angiotensin converting enzyme) elevated - used as marker
• Skin: erythema nodosum, lupus pernio
• Eye: uveitis; also hypercalcemia (granulomas produce calcitriol)
• Kveim test (historical)

7. Pulmonary Tuberculosis ⭐

• Primary complex: Ghon focus (lower zone of upper lobe or upper zone of lower lobe) + hilar lymph nodes = Ghon complex
• Secondary TB: upper lobe, Simon foci, cavity formation, Rasmussen aneurysm
• Microscopy: caseating granuloma with central caseous necrosis, Langhans giant cells, epithelioid cells, peripheral lymphocytes
• Complications: miliary TB, empyema, pneumothorax, fibrocaseous TB

8. Asbestosis ⭐

• Diffuse interstitial fibrosis caused by asbestos fibers
• Asbestos bodies (ferruginous bodies): golden-brown beaded rods with iron coating
• Lower lobe predominance (unlike silicosis which is upper lobe)
• Complications: mesothelioma, bronchogenic carcinoma (synergistic with smoking), pleural plaques

9. Pulmonary Edema ⭐

• Hemodynamic: raised capillary hydrostatic pressure (LVF most common)
• Permeability: ARDS (diffuse alveolar damage), sepsis
• Gross: heavy, wet lungs; frothy fluid
• Micro: eosinophilic proteinaceous fluid in alveoli; hyaline membranes in ARDS
• Hemosiderin-laden macrophages (heart failure cells) in chronic pulmonary congestion

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CHAPTER 2 - LIVER, GALLBLADDER & PANCREAS

ESSAYS (15-mark questions)

Essay 1 - Viral Hepatitis ⭐⭐⭐

• Types and comparison table first:

• HBV serology (most tested):
  • HBsAg: appears first, indicator of infection
  • HBeAg: marker of active replication and high infectivity
  • Anti-HBc IgM: window period marker (when HBsAg gone but anti-HBs not yet appeared)
  • Anti-HBs: recovery and immunity
  • Ground glass hepatocytes (HBsAg in ER)
  • Dane particle = complete HBV virion
• Morphology of acute hepatitis (all types):
  • Ballooning degeneration of hepatocytes
  • Councilman (acidophil) bodies = apoptotic hepatocytes
  • Lobular disarray
  • Portal tract inflammation (lymphocytes)
  • Piecemeal necrosis in chronic hepatitis
• Chronic hepatitis: interface hepatitis (piecemeal necrosis), fibrosis, grading (activity) vs staging (fibrosis)

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Essay 2 - Cirrhosis of Liver ⭐⭐⭐

• Definition: irreversible diffuse fibrosis + regenerative nodules + architectural distortion
• Classification:
  • Micronodular (<3mm): alcohol, biliary, hemochromatosis
  • Macronodular (>3mm): post-viral (HBV, HCV)
  • Mixed
• Causes: alcohol (most common in West), viral hepatitis (most common worldwide)
• Alcoholic liver disease progression:
  • Fatty change (steatosis): reversible, macro/microvesicular fat
  • Alcoholic hepatitis: Mallory-Denk bodies (eosinophilic cytoplasmic inclusions of cytokeratin), neutrophilic infiltrate
  • Cirrhosis: micronodular, irreversible
• Complications of cirrhosis (always asked):
  • Portal hypertension → esophageal varices (rupture = major cause of death), caput medusae, hemorrhoids, splenomegaly
  • Ascites (hypoalbuminemia + portal HTN + aldosterone)
  • Hepatic encephalopathy (ammonia toxicity, asterixis)
  • Hepatorenal syndrome
  • Hepatocellular carcinoma (most important long-term complication)
  • Spontaneous bacterial peritonitis

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Essay 3 - Hepatocellular Carcinoma (HCC) ⭐⭐

• Most common primary liver malignancy
• Strong associations: HBV, HCV, cirrhosis (any cause), aflatoxin (Aspergillus in food), hemochromatosis, alcoholic cirrhosis
• AFP (alpha-fetoprotein) elevated - tumor marker
• Gross: solitary mass, or multifocal, or diffuse; bile-stained, hemorrhagic
• Micro: trabecular pattern (most common), acinar/pseudoglandular, clear cell variant
• Spread: portal vein invasion (hematogenous spread is characteristic), IVC extension
• Prognosis poor; BCLC staging used clinically

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SHORT NOTES (5-mark questions)

1. Alcoholic Liver Disease ⭐⭐

• Three stages: fatty liver → alcoholic hepatitis → cirrhosis
• Fatty liver: most common and earliest lesion; macrovesicular steatosis (nucleus pushed to side); reversible with abstinence
• Alcoholic hepatitis: Mallory-Denk bodies (perinuclear eosinophilic tangles), neutrophil infiltration, hepatocyte necrosis, satellite necrosis (neutrophils around dying hepatocytes)
• Cirrhosis: micronodular, perivenular fibrosis early, eventually panlobular

2. Jaundice ⭐⭐

• Classification: pre-hepatic (hemolytic), hepatic (hepatocellular), post-hepatic (obstructive/cholestatic)
• Pre-hepatic: unconjugated↑, urine urobilinogen↑, no bilirubin in urine, normal stools
• Hepatic: mixed picture, both conjugated and unconjugated raised
• Post-hepatic: conjugated↑, dark urine (bilirubin), pale stools, steatorrhea, itching
• Bile plugs in canaliculi on histology in cholestasis

3. Wilson's Disease ⭐

• Autosomal recessive, ATP7B gene mutation
• Copper accumulation: liver (cirrhosis), brain (basal ganglia → neuropsychiatric), eye (Kayser-Fleischer rings - pathognomonic), kidney
• Lab: low serum ceruloplasmin, high urinary copper
• Orcein stain shows copper-associated protein in liver

4. Hemochromatosis ⭐

• Autosomal recessive, HFE gene (C282Y mutation most common)
• Iron overload: liver (cirrhosis), pancreas (bronze diabetes), skin (bronzing), heart (restrictive cardiomyopathy), joints, pituitary
• Prussian blue stain for iron
• Increased risk of HCC even after treatment

5. Acute Pancreatitis ⭐⭐

• Causes: GET SMASHED (Gallstones #1, Ethanol #2, Trauma, Steroids, Mumps, Autoimmune, Scorpion, Hyperlipidemia/Hypercalcemia, ERCP, Drugs)
• Pathogenesis: premature activation of trypsinogen → autodigestion
• Gross: fat necrosis (chalky white deposits = calcium soap/saponification), hemorrhagic areas
• Micro: fat necrosis, interstitial edema, neutrophilic infiltrate, acinar cell destruction
• Serum amylase + lipase elevated (lipase more specific)
• Complications: pseudocyst (most common), abscess, ARDS, DIC, hypocalcemia

6. Chronic Pancreatitis ⭐

• Causes: alcohol (most common in adults), gallstones, idiopathic, CF in children
• Fibrosis + acinar atrophy + ductal dilatation + calcification
• Calcifications on plain X-ray is characteristic
• Complications: exocrine insufficiency (malabsorption, steatorrhea), endocrine insufficiency (DM), pseudocysts, increased risk of pancreatic carcinoma

7. Carcinoma Pancreas ⭐⭐

• 85-90% are ductal adenocarcinoma
• Location: head (60-70%) → obstructive jaundice + Courvoisier sign (palpable gallbladder + painless jaundice = malignancy till proven otherwise)
• Body/tail: presents late, weight loss, pain
• Tumor marker: CA 19-9
• Micro: poorly differentiated glands in dense desmoplastic stroma
• Trousseau sign: migratory thrombophlebitis (paraneoplastic)
• Poor prognosis (5-year survival <5%)

8. Gallstones (Cholelithiasis) ⭐

• Cholesterol stones (most common, 80%): yellow, solitary/multiple, radiolucent; risk factors = 5 F's (Fat, Female, Fertile, Forty, Fair)
• Pigment stones: black (hemolytic anemia, cirrhosis, sterile bile) vs brown (infection, bacteria deconjugate bilirubin)
• Complications: cholecystitis, cholangitis, Mirizzi syndrome, gallstone ileus, carcinoma gallbladder (porcelain gallbladder)

9. Carcinoma Gallbladder ⭐

• Most common biliary tract cancer
• Associated with gallstones (70-90%), porcelain gallbladder
• Adenocarcinoma most common type
• Poor prognosis due to late presentation
• Spreads to liver (direct), peritoneum

10. Portal Hypertension ⭐

• Normal portal pressure 5-10 mmHg; portal HTN >12 mmHg
• Causes: pre-hepatic (portal vein thrombosis), hepatic (cirrhosis - sinusoidal), post-hepatic (Budd-Chiari, right heart failure)
• Consequences: portosystemic collaterals (varices at lower esophagus, rectum, anterior abdominal wall), splenomegaly, ascites, hepatic encephalopathy
• Most dangerous: esophageal varices rupture (variceal bleeding)

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Summary Table - What to Prioritise

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Days Required - Respiratory + Liver/Gallbladder/Pancreas

Respiratory System - 2 Days

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Liver, Gallbladder & Pancreas - 2 Days

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Total: 4 Days for both chapters

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One Important Note

TNMGR Pathology - Revision Checklist

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RESPIRATORY SYSTEM (Day 1-2)

Essays

Short Notes

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LIVER, GALLBLADDER & PANCREAS (Day 3-4)

Essays

Short Notes

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GIT - STOMACH, INTESTINE, COLON (Day 5)

Essays

Short Notes

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KIDNEY & URINARY TRACT (Day 5-6)

Essays

Short Notes

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BREAST & THYROID (Day 6)

Essays

Short Notes

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FEMALE & MALE REPRODUCTIVE (Day 7)

Essays

Short Notes

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CVS (Day 8)

Essays

Short Notes

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CNS + HEAD & NECK + EYE + PERIPHERAL NERVES (Day 8-9)

Essays

Short Notes

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BONE, SOFT TISSUE & SKIN (Day 9)

Short Notes

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HAEMATOLOGY (Day 9-10)

Essays

Short Notes

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PROGRESS TRACKER

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How to Use This Checklist

• Read = you have gone through Robbins for that topic
• Written = you have written the answer from memory without looking
• Revised = you have gone back over it at least once after writing
• PYQ Done = you have answered at least one previous year question on that essay topic