2nd Year MBBS Pathology OSPE - Complete Answers

CASE 1 - Amyloidosis (Renal) [Slide 35/37 & 37/37]

• Large, pale, waxy, firm kidneys on gross examination
• Polarized microscopy showing apple-green birefringence = pathognomonic of amyloid

• Under routine light: orange-red color
• Under polarized light: apple-green birefringence (the image shown)

Source: Robbins, Cotran & Kumar Pathologic Basis of Disease

CASE 2 - Leprosy (Hansen's Disease) [Slide 37/37]

• Diagnosis: Leprosy (Borderline Tuberculoid / Tuberculoid Leprosy)
• Etiology: Mycobacterium leprae (acid-fast, obligate intracellular bacillus)
• Gross image: hypopigmented plaque with raised erythematous border
• Microscopic image: granulomatous inflammation with epithelioid cells and lymphocytes surrounding a nerve twig

• Fite-Faraco stain (modified ZN stain) - for demonstrating M. leprae (acid-fast bacilli) in tissue
• Wade-Fite stain - preferred stain for leprosy bacilli in slit skin smear
• Alternatively: Ziehl-Neelsen (ZN) stain - bacilli appear red on blue background

CASE 3 - Systemic Lupus Erythematosus (SLE) [Slides 34/37 & 35/37 top]

• Classic butterfly (malar) rash sparing nasolabial folds
• ANA positive + low complement (C3, C4) + proteinuria = SLE

1. Anti-dsDNA (anti-double stranded DNA) - most specific for SLE, correlates with disease activity
2. Anti-Sm (anti-Smith) - most specific antibody for SLE

• Others: Anti-Ro/SSA, Anti-La/SSB, Anti-histone (drug-induced lupus), Anti-phospholipid antibodies

1. Lupus nephritis (diffuse proliferative - most severe form; leads to renal failure)
2. Libman-Sacks endocarditis (non-infective verrucous endocarditis; small vegetations on both surfaces of mitral valve)

• Others: CNS lupus (psychosis, seizures), cytopenias, accelerated atherosclerosis, antiphospholipid syndrome (DVT, recurrent abortions)

CASE 4 - HIV (Slides 33/37 & 34/37)

• It is a Retrovirus, Family Retroviridae, Genus Lentivirus
• RNA virus with reverse transcriptase

• gp120 binds to CD4 receptor on helper T-lymphocytes, macrophages, and dendritic cells
• Co-receptors: CCR5 (macrophage tropic) and CXCR4 (T-cell tropic)
• gp41 mediates fusion of viral envelope with host cell membrane (after gp120 binding)

CASE 5 - Cardiac Hypertrophy (Slides 29/37, 30/37)

• Increase in cell size (not number) due to increased workload from hypertension

• Physiological hypertrophy (e.g., athlete's heart) is reversible and has normal myocardial structure
• Pathological hypertrophy (as here) is due to pressure overload (hypertension), leads to fibrosis, myocyte disarray, and eventually heart failure

1. Uterine hypertrophy during pregnancy (estrogen and progesterone-induced)
2. Skeletal muscle hypertrophy due to growth hormone / androgens (testosterone)

• Also acceptable: Breast hypertrophy during pregnancy/lactation; adrenal cortex hypertrophy by ACTH

CASE 6 - Klinefelter Syndrome (Slides 30/37 bottom & 31/37)

• Classic features: tall, eunuchoid, gynecomastia, small testes, infertility, low testosterone

• Extra X chromosome (most common sex chromosome aneuploidy in males)
• Results from non-disjunction during meiosis (usually maternal)
• Other mosaic variants: 46,XY/47,XXY

CASE 7 - Turner Syndrome (Slide 32/37 top)

• Bicuspid aortic valve (most common, ~30% of patients)
• Coarctation of aorta (also classic and frequently asked)

Karyotype: 45, X (45,X0) - Source: Robbins, Cotran & Kumar Pathologic Basis of Disease

CASE 8 - Down Syndrome (Slide 32/37 bottom & 33/37)

• Congenital heart disease (most common cause of death in early life; ASD, VSD, atrioventricular septal defect / endocardial cushion defect)
• OR: Increased risk of Acute Leukemia (ALL most common, also AML - risk 10-20x increased)
• Also: Alzheimer disease (early onset, by 4th-5th decade), Hirschsprung disease

CASE 9 - Rheumatic Heart Disease (Slide 28/37)

• Location: within the Aschoff body/nodule

1. Langhans giant cell - TB/granulomatous inflammation; nuclei arranged in horseshoe/peripheral pattern
2. Foreign body giant cell - nuclei randomly scattered; response to indigestible material
3. Reed-Sternberg cell (Hodgkin's lymphoma) - binucleate "owl eye" appearance
4. Touton giant cell - xanthomas; wreath of nuclei with foamy cytoplasm peripherally

• Anitschkow cell (caterpillar cell / myocyte-derived macrophage)
• Pathognomonic of rheumatic fever; has caterpillar/owl-eye chromatin pattern in elongated nucleus
• These are the PRECURSORS that evolve into Aschoff giant cells

CASE 10 - Anthracosis / Coal Workers' Pneumoconiosis (Slide 29/37 middle)

• Black pigment = carbon/coal dust deposited in lungs and draining lymph nodes

1. Aggregates of black carbon pigment deposited in alveolar walls and interstitium
2. Carbon-laden macrophages (dust cells) accumulated in connective tissue around bronchioles and lymphatics; may cause fibroblastic reaction

1. Silica (Silicosis) - silicotic nodules with whorled collagen
2. Asbestos (Asbestosis) - asbestos bodies (ferruginous bodies), lower lobe fibrosis

• Others acceptable: Talc, beryllium, iron (siderosis)

CASE 11 - Atherosclerosis with Hypertension (Slide 25/37 top portion)

1. Hypertension itself (bidirectional relationship)
2. Hyperlipidemia / Dyslipidemia (elevated LDL cholesterol)

• Others: Diabetes mellitus, smoking, obesity, sedentary lifestyle

1. Fatty streak - earliest lesion; intimal foam cells (lipid-laden macrophages), no luminal obstruction
2. Fibrous/Atheromatous plaque - fibrous cap + necrotic lipid core with cholesterol clefts, calcification, foam cells

1. Myocardial infarction (coronary artery occlusion)
2. Stroke (cerebral artery occlusion)
3. Peripheral vascular disease, aortic aneurysm, mesenteric ischemia, renal artery stenosis

CASE 12 - Wilms Tumor (Nephroblastoma) [Slide 25/37]

• Blastemal component (small blue cells, high N:C ratio)
• Epithelial component (primitive tubules/glomeruloid structures)
• Stromal component (spindle cells, fibromyxoid tissue)

• WT1 gene mutation (Wilms Tumor suppressor gene 1, chromosome 11p13)
• WT2 locus (chromosome 11p15, IGF2 imprinting)
• CTNNB1 (beta-catenin) mutations

• Favorable histology (no anaplasia): 90% survival
• Unfavorable/anaplastic histology: significantly worse prognosis
• Also: Stage at diagnosis

• Associated with WT2 locus (11p15), IGF2 overexpression
• Increased risk of Wilms tumor and hepatoblastoma

Quick Exam Tip Sheet

2nd Year MBBS Pathology OSPE - Complete Answers (Set 2)

CASE 13 - Thrombosis / Antemortem Thrombus [Slide - Top portion]

• Lines of Zahn - alternating pale layers (platelets + fibrin) and dark layers (red cells) = pathognomonic of antemortem thrombus
• Fibrin meshwork entrapping RBCs and inflammatory cells
• Attached to vessel wall at one end (mural attachment point)

1. Endothelial injury (most important) - atherosclerosis, hypertension, trauma
2. Stasis/Turbulence of blood flow - atrial fibrillation, varicose veins, bed rest
3. Hypercoagulability - malignancy, oral contraceptives, inherited thrombophilia (Factor V Leiden)

1. Embolism (most dangerous - pulmonary embolism, stroke)
2. Infarction of the organ supplied
3. Others: venous congestion, edema, post-thrombotic syndrome, organization and recanalization

CASE 14 - Myocardial Infarction [Slide 27/37]

1. Wavy/elongated cardiomyocytes - cardiomyocytes appear stretched and undulated due to contraction bands at the periphery of the infarct
2. Coagulative necrosis - hypereosinophilic (deeply pink) myocytes with loss/pyknosis/karyolysis of nuclei ("ghost outlines" of dead cells preserved)

• At 12-24 hrs: neutrophilic infiltration begins
• At 1-3 days: frank coagulative necrosis with heavy neutrophilic infiltrate

1. Troponin I / Troponin T (most sensitive and specific; rises at 3-6 hrs, peaks 24-48 hrs, remains elevated 7-10 days)
2. CK-MB (Creatine Kinase-MB isoform) - rises at 3-6 hrs, peaks at 24 hrs, returns to normal at 48-72 hrs; useful for detecting reinfarction

• Also acceptable: LDH (LD-1 > LD-2 flip pattern), Myoglobin (earliest, non-specific)

CASE 15 - Sickle Cell Anemia [Slide 17/37]

• Sickle Cell Anemia (Hemoglobin SS disease)
• Justification: childhood onset, chronic hemolytic anemia (low Hb, elevated unconjugated bilirubin, elevated urobilinogen = extravascular hemolysis), sickle cells on peripheral smear, high reticulocyte count (regenerative), painful crises (vaso-occlusion causing joint pain and fever)

• Point mutation in beta-globin gene (chromosome 11)
• Glutamic acid (hydrophilic) replaced by Valine (hydrophobic) at position 6 of beta-globin chain
• GAG → GTG (codon 6); leads to HbS instead of HbA
• Autosomal recessive inheritance

1. Hemoglobin electrophoresis - gold standard; shows HbS band; in sickle cell disease: HbS >90%, no HbA; in trait: ~40% HbS + ~60% HbA
2. Sickling test (Sodium metabisulfite test) - RBCs sickle under deoxygenated conditions

• Also: High Performance Liquid Chromatography (HPLC), Solubility test, genetic testing (PCR)

CASE 16 - Peripheral Smear Problem Based Questions [Slides 18/37 & 19/37]

Slide 18/37 - Leishman-stained peripheral smear with arrow pointing to a cell

• Based on multilobed nucleus: Neutrophil (Segmented / Polymorphonuclear leukocyte)
• If hypersegmented (>5 lobes): Hypersegmented neutrophil (seen in megaloblastic anemia)

• Erythrocytes (RBCs), Lymphocytes, Monocytes, Eosinophils, Basophils, Platelets

Slide 19/37 - Large cells with dark small clusters (likely blast cells)

• ALL (Acute Lymphoblastic Leukemia): Children, peak age 2-5 years
• AML: Adults (median 60+ years)

Slide 20/37 - Papanicolaou (Pap) stained cervicovaginal smear

• Superficial Squamous Cell (if pink with pyknotic nucleus) OR
• Intermediate Squamous Cell (if blue-green/cyanophilic with open nucleus)

• Papanicolaou (Pap) stain (polychrome stain using haematoxylin + OG-6 + EA-65)

Slide 21/37 - Smear with honeycomb cluster + arrow

• Endocervical glandular cells (columnar cells arranged in honeycomb/picket-fence pattern)

• Endocervical brush (Cytobrush) - for sampling endocervical canal
• For ectocervix: Ayre's spatula (Cervical spatula)

CASE 17 - Iron Deficiency Anemia [Slide 15/37]

1. Absent/depleted iron stores - Prussian blue stain shows no sideroblasts and no storage iron in macrophages (most specific finding)
2. Erythroid hyperplasia with normoblasts showing scanty, ragged ("frayed") cytoplasm (hypochromic normoblasts)

• Overall: hypercellular marrow with increased erythroid precursors, M:E ratio decreased

1. Serum ferritin - lowest in IDA; most sensitive marker of iron stores (normal: 12-150 ng/mL); <12 ng/mL = IDA
2. Serum iron + TIBC + Transferrin saturation - Serum iron low, TIBC elevated, saturation <15% in IDA

• Also: Serum transferrin receptor (elevated in IDA), reticulocyte hemoglobin content

CASE 18 - Multiple Myeloma [Slide - Skull X-ray + BM aspirate portion]

• Multiple Myeloma (most likely given plasma cells + punched-out skull lesions)
• Others in differential: Metastatic carcinoma, Plasmacytoma, Waldenstrom's macroglobulinemia, Lymphoma

1. Serum protein electrophoresis (SPEP) - to detect M-spike (monoclonal immunoglobulin band, usually IgG or IgA); urine Bence-Jones protein (free light chains)
2. Complete blood count + Serum calcium + Renal function tests (creatinine, BUN) - CBC for anemia (normocytic normochromic); calcium for hypercalcemia; renal function for myeloma kidney (cast nephropathy)

• Why: To confirm CRAB criteria (hyperCalcemia, Renal failure, Anemia, Bone lesions)

• Findings: >10% (often >30%) atypical/malignant plasma cells with:
  • Eccentric round nucleus with "clock-face" / cartwheel chromatin
  • Abundant basophilic cytoplasm
  • Prominent perinuclear hof (pale zone = Golgi apparatus)
  • Binucleated/multinucleated forms (malignant feature)
  • Russell bodies (eosinophilic immunoglobulin inclusions in cytoplasm)
• Diagnosis: Multiple Myeloma (Plasma Cell Myeloma)

CASE 19 - Peptic Ulcer - NSAID-induced [Slide 22/37]

• Round/oval, sharply punched-out ulcer on the lesser curvature of the stomach
• Clean base, smooth margins, surrounding mucosal folds radiate toward the ulcer (converging folds)
• NSAID-induced: typically multiple, shallow, with no surrounding inflammation (silent)

1. First part of the duodenum (duodenal ulcer, most common - anterior wall of D1)
2. Lesser curvature of the stomach (gastric ulcer, particularly the antrum-body junction)

• Helicobacter pylori (H. pylori)
• Gram-negative, spiral/curved, urease-positive bacterium
• Causes 70-80% of gastric ulcers and ~90% of duodenal ulcers
• Damages mucosal defense (mucus, bicarbonate) via urease, CagA, VacA toxins

• Gastric ulcer (can rarely undergo malignant transformation to gastric adenocarcinoma, especially H. pylori-associated; ~1-3%)
• Duodenal ulcers virtually NEVER become malignant (this is a key distinguishing fact)

CASE 20 - Barrett's Esophagus / GERD [Slide 23/37]

• Gastroesophageal Reflux Disease (GERD) - caused by reflux of gastric acid
• Organism: H. pylori is NOT the primary cause of GERD/Barrett's; GERD is the cause
• If asking about underlying condition: Chronic acid reflux leading to Barrett's esophagus

• Gross findings:
  • Lower esophagus shows salmon-pink/velvety red mucosal tongues replacing normal pale squamous mucosa
  • Irregular Z-line (squamocolumnar junction displaced proximally)
  • Erosions and ulcers may be present
• Microscopic findings:
  • Normal stratified squamous epithelium replaced by columnar intestinal metaplasia
  • Goblet cells (hallmark - mucin-secreting cells with a goblet shape, Alcian blue positive)
  • May show low-grade or high-grade dysplasia

• Esophageal adenocarcinoma (Barrett's esophagus carries 30-40x increased risk; progression: metaplasia → low-grade dysplasia → high-grade dysplasia → adenocarcinoma)

CASE 21 - Atherosclerosis [Slide 24/37]

• Atherosclerosis - leading to renovascular hypertension (renal artery stenosis → RAAS activation)

1. Diabetes mellitus (glycation of proteins, endothelial dysfunction)
2. Hypertension / Obesity / Dyslipidemia / Smoking (any two)

1. Fatty streak - earliest reversible lesion; intimal accumulation of lipid-laden foam cells (macrophages)
2. Fibrous/Atheromatous plaque - fibrous cap (smooth muscle + collagen) overlying a necrotic lipid core with cholesterol clefts, calcification, foam cells, and neovascularization

1. Ischemic heart disease / Myocardial infarction (coronary artery disease)
2. Stroke / TIA (cerebrovascular disease - thrombosis or embolism)
3. Peripheral arterial disease, aortic aneurysm, renal artery stenosis, mesenteric ischemia

Quick Exam Tip Sheet (Set 2)

2nd Year MBBS Pathology OSPE - Complete Answers (Set 3)

CASE 22 - Beta Thalassemia Major [Slide 16/37]

• Classic triad: severe microcytic hemolytic anemia + hepatosplenomegaly + skeletal changes from marrow expansion

• Deficiency/absence of beta-globin chain synthesis due to mutations in the beta-globin gene (chromosome 11)
• Results in excess alpha-chains that precipitate → damage RBC membrane → hemolysis
• Autosomal recessive inheritance; both alleles affected (homozygous)

1. Thalassemia Major (Cooley's Anemia) - β⁰/β⁰ or β⁰/β⁺; severe, transfusion-dependent, presents in infancy
2. Thalassemia Intermedia - β⁺/β⁺ or β⁺/β⁰; moderate severity, may not need regular transfusions
3. Thalassemia Minor (Trait) - β/β⁰ or β/β⁺; heterozygous carrier, mild/no anemia, elevated HbA2 >3.5%
4. Thalassemia Minima - silent carrier; normal CBC, normal HbA2

• Hemoglobin Electrophoresis (or HPLC - High Performance Liquid Chromatography)
• Thalassemia major: HbF markedly elevated (>90%), HbA absent or minimal, HbA2 variable
• Thalassemia trait: HbA2 >3.5% (key diagnostic finding)
• DNA analysis / PCR for gene mutations (for definitive typing)

CASE 23 - Chronic Myeloid Leukemia (CML) [Slide 13/37]

• Markedly elevated WBC with complete myeloid spectrum, thrombocytosis, massive splenomegaly

• Philadelphia chromosome (Ph chromosome) - t(9;22)(q34;q11.2)
• Translocation of BCR gene (chromosome 22) with ABL1 gene (chromosome 9) → BCR-ABL1 fusion gene
• Produces a constitutively active tyrosine kinase (p210 protein) driving uncontrolled myeloid proliferation

• Low / Decreased NAP score (score 0-20; normal 20-100)
• This is a key distinguishing feature from leukemoid reaction (where NAP is HIGH)
• CML neutrophils have low alkaline phosphatase activity despite appearing mature

• Other conditions with Ph chromosome: Acute lymphoblastic leukemia (ALL) - in 25-30% of adult ALL; also rarely in AML
• Genetic methods:
  1. Cytogenetics / Karyotyping - detects t(9;22) translocation
  2. FISH (Fluorescence In Situ Hybridization) - detects BCR-ABL1 fusion gene
  3. RT-PCR (Reverse Transcriptase PCR) - detects BCR-ABL1 mRNA; most sensitive; used for monitoring minimal residual disease

CASE 24 - Acute Myeloid Leukemia (AML) with Auer Rods [Slide 12/37]

• Auer Rods (Auer bodies) - pink/red rod-shaped cytoplasmic inclusions
• Composed of fused primary (azurophilic) granules containing myeloperoxidase, lysosomal enzymes
• Pathognomonic of AML; NEVER seen in ALL
• Multiple Auer rods bundled together = "Faggot cells" (classic for APL/AML-M3)

• Thrombocytopenia (low platelets 23×10⁹/L) → impaired primary hemostasis → mucosal bleeding
• In APL specifically: DIC (Disseminated Intravascular Coagulation) - leukemic promyelocytes release tissue factor and proteases → consuming clotting factors + platelets → gum bleeding, purpura, petechiae

1. Myeloperoxidase (MPO) stain - positive in AML (myeloid lineage); negative in ALL - MOST important
2. Sudan Black B stain - stains lipids in myeloid granules; positive in AML
3. Non-specific esterase (NSE/alpha-naphthyl acetate esterase) - positive in monocytic AML (M4/M5)
4. PAS stain - positive in ALL (block positivity); also positive in erythroid AML (M6)

CASE 25 - Multiple Myeloma [Slide 14/37] (Full case)

• Multiple Myeloma (most likely - monoclonal IgA spike + lytic bone lesions + plasma cells in BM)
• Others: Plasmacytoma, Waldenstrom's Macroglobulinemia, MGUS (Monoclonal Gammopathy of Undetermined Significance), Metastatic carcinoma to bone

1. 24-hour urine protein electrophoresis / Bence-Jones protein - detect free light chains (kappa or lambda) in urine; confirms myeloma kidney; why: 20% of myelomas are light chain only, missed on serum SPEP
2. Serum free light chain assay + beta-2 microglobulin + LDH - for staging (ISS staging: beta-2 microglobulin + albumin); LDH for tumor burden; why: critical for prognosis

• Also: bone marrow biopsy (confirmatory), skeletal survey, serum calcium

• Findings:

  • 30% plasma cells (normal <5%)

  • Cells show eccentric nucleus with "clock-face" / cartwheel chromatin
  • Prominent perinuclear hof (pale zone = Golgi apparatus)
  • Binucleated and multinucleated malignant plasma cells
  • Russell bodies (eosinophilic cytoplasmic immunoglobulin inclusions)
  • Flame cells (IgA myeloma)
• Diagnosis: Multiple Myeloma (IgA type)

CASE 26 - Immune Thrombocytopenic Purpura (ITP) [Slide - 9-year-old girl with epistaxis]

• Thrombocytopenia + increased megakaryocytes in BM (peripheral destruction, not production failure)

1. Platelet count markedly decreased (<50,000/µL; often <20,000/µL in acute ITP)
2. Peripheral smear: Decreased/absent platelets; RBCs and WBCs morphologically normal; may see large platelets (megathrombocytes - compensatory)
3. Bone marrow: Increased megakaryocytes (hypercellular); megakaryocytes appear normal to large ("bare megakaryocytes" - platelet shedding into blood arrested by antibody)
4. Positive anti-platelet antibodies (IgG against GPIIb/IIIa or GPIb/IX); Platelet-associated IgG elevated
5. Bleeding time prolonged; PT and APTT normal (only primary hemostasis defect)

• Mucocutaneous bleeding:
  • Petechiae (pinpoint non-blanching hemorrhages in skin)
  • Purpura (larger skin hemorrhages)
  • Ecchymoses (bruising)
  • Epistaxis (nosebleed - as in this case)
  • Gum bleeding, menorrhagia (in females)
• No splenomegaly (unlike hypersplenism)
• Most dangerous complication: Intracranial hemorrhage (rare, <1%)
• Acute ITP in children: usually follows viral infection (2-3 weeks prior), self-limiting (80% resolve spontaneously in 6 months)

CASE 27 - DIC (Disseminated Intravascular Coagulation) [Slide 10/37]

• Classic lab: prolonged PT + APTT + TT + low platelets + positive D-dimer + elevated LDH + schistocytes (microangiopathic hemolytic anemia)

1. Abruptio placentae (placental abruption) - release of tissue thromboplastin
2. Amniotic fluid embolism - most catastrophic
3. Eclampsia / HELLP syndrome (Hemolysis, Elevated Liver enzymes, Low Platelets)
4. Retained dead fetus / septic abortion Other causes:

• Septicemia/gram-negative sepsis (most common overall), massive transfusion, burns, trauma, malignancy (APL - M3)

CASE 28 - Nephrotic Syndrome [Slide 8/37]

• Nephrotic Syndrome - most likely Minimal Change Disease (Lipoid Nephrosis) in this age group
• Justification:
  • Massive proteinuria (++++ = >3.5 g/day in adults; >40 mg/m²/hr in children)
  • Hyaline and fatty casts in urine (fatty casts = oval fat bodies from lipiduria = pathognomonic)
  • Facial puffiness + abdominal swelling = generalized edema (due to hypoalbuminemia)
  • Age 4 years + no hematuria → Minimal Change Disease (most common nephrotic syndrome in children)

1. Minimal Change Disease (children >90%; adults ~25%)
2. Focal Segmental Glomerulosclerosis (FSGS)
3. Membranous Nephropathy (most common in adults)
4. Membranoproliferative GN

• Diabetes mellitus (diabetic nephropathy), SLE (lupus nephritis), Amyloidosis, drugs (NSAIDs, penicillamine), infections (Hepatitis B, malaria)

1. Proteinuria >3.5 g/day (heavy/nephrotic range) - MANDATORY / hallmark
2. Hypoalbuminemia (<3.5 g/dL) - due to urinary protein loss
3. Edema (periorbital, facial, pedal, ascites, anasarca) - due to low oncotic pressure
4. Hyperlipidemia (elevated cholesterol, triglycerides) - compensatory hepatic synthesis
5. Lipiduria (fatty casts, oval fat bodies, "Maltese cross" pattern under polarized light)

Note: The question asks to enumerate criteria for nephritic syndrome (as shown in slide) - if this is what is asked: Nephritic Syndrome criteria: Hematuria (RBC casts), oliguria, hypertension, mild-moderate proteinuria (<3.5 g/day), azotemia (elevated creatinine/BUN), edema

CASE 29 - Hemophilia A [Slide 9/37]

• Hemarthrosis (hallmark) + prolonged APTT + normal PT + Factor VIII activity <5% = confirms diagnosis

• Gene: F8 gene mutation on X chromosome (Xq28)
• Mode of transmission: X-linked recessive
  • Males affected (XᴴY), Females are carriers (XᴴX) - usually asymptomatic
  • All daughters of affected males are obligate carriers
  • 50% sons of carrier mothers are affected
• Mutation types: Large deletions, inversions (intron 22 inversion = most common, 45% of severe cases), point mutations, small insertions/deletions
• Severity based on Factor VIII level:
  • Severe: <1% activity (spontaneous bleeding)
  • Moderate: 1-5% (bleeding with minor trauma - as in this case)
  • Mild: 6-30% (bleeding only with surgery/major trauma)

1. Hemarthrosis → Chronic synovitis → Joint destruction → Hemophilic arthropathy (crippling, as in this case)
2. Development of inhibitors (anti-Factor VIII antibodies) in 20-30% of patients on Factor VIII replacement - most serious treatment complication
3. Intracranial hemorrhage - life-threatening
4. Pseudotumor (encapsulated hematoma in bone/muscle)
5. Transmission of infections (historical: HIV, HCV via plasma-derived Factor VIII concentrates - now eliminated with recombinant products)
6. Deep muscle hematomas, retroperitoneal bleeding

CASE 30 - CSF Interpretation: Tuberculous Meningitis [Slide 5/37]

• Appearance: Turbid
• Coagulum: Cobweb formation / Coagulum present ← KEY finding
• Protein: 100 mg/dL (elevated; normal <45 mg/dL)
• Sugar: 25 mg/dL (very low; normal 50-80 mg/dL; CSF:blood glucose ratio <0.3)
• Chlorides: 500 mg/dL (low; normal 720-750 mg/dL)
• Lymphocytes: 300 cells/cu.mm (lymphocytic pleocytosis)

• Classic triad: turbid CSF + cobweb clot + very low sugar + lymphocytic pleocytosis + high protein + low chlorides

1. AFB smear and culture of CSF (Ziehl-Neelsen stain) - gold standard but slow (weeks); smear sensitivity low (~40%)
2. CSF PCR for Mycobacterium tuberculosis (rapid, highly sensitive and specific; detects MTB DNA)
3. ADA (Adenosine Deaminase) level in CSF - elevated >10 U/L in TBM; simple and rapid
4. Chest X-ray - may show primary complex, miliary TB
5. Mantoux test / IGRA - supportive (may be negative in immunocompromised)
6. CBNAAT (GeneXpert MTB/RIF) - rapid molecular test, also detects rifampicin resistance

CASE 31 - CSF Interpretation: Bacterial Meningitis [Slides 4/37 & top portion]

• Colour: Colourless (or turbid/purulent)
• Appearance: Turbid (cloudy/purulent)
• Coagulum: Absent
• (Inferred typical bacterial meningitis pattern: very high protein, very low glucose, PMN pleocytosis)

• Turbid CSF + neck rigidity + delirium + fever + child age group

• Neonates (0-1 month): Group B Streptococcus (Streptococcus agalactiae), Escherichia coli, Listeria monocytogenes
• Infants/Children (1 month - 5 years): Neisseria meningitidis (most common in this age), Streptococcus pneumoniae, Haemophilus influenzae type b
• Adults: Streptococcus pneumoniae (most common), Neisseria meningitidis
• Elderly/Immunocompromised: Listeria monocytogenes, S. pneumoniae

CASE 32 - Obstructive Jaundice [Slide 7/37]

• Obstructive (Post-hepatic / Cholestatic) Jaundice
• Supporting evidence:
  1. Conjugated (direct) bilirubin predominant (10.8/14.2 mg/dL = >75% direct)
  2. Markedly elevated ALP (780 U/L) and GGT - hallmarks of bile duct obstruction
  3. Dark urine (bilirubin in urine = bilirubinuria - only conjugated bilirubin is water-soluble and excreted in urine)
  4. Clay-colored/pale stools (absence of stercobilinogen due to blocked bile reaching gut)
  5. Generalized pruritus (bile salt deposition in skin)
  6. CECT: mass compressing CBD - mechanical obstruction
  7. Transaminases (AST, ALT) only mildly elevated (not markedly elevated as in hepatocellular jaundice)

• Carcinoma of head of pancreas (mass in head of pancreas compressing distal CBD)
• Classic presentation: painless progressive jaundice in older patient with constitutional symptoms
• Most common pancreatic cancer: ductal adenocarcinoma
• Also known as "Courvoisier's sign" - palpable, non-tender, distended gallbladder in obstructive jaundice due to malignancy (stone-induced obstruction does NOT give Courvoisier's sign)

Quick Exam Tip Sheet (Set 3)

2nd Year MBBS Pathology OSPE - Complete Answers (Set 4)

CASE 33 - CSF Interpretation: Viral Meningitis [Slide 6/37]

• Colour: Colourless
• Appearance: Turbid (mildly turbid)
• Coagulum: Absent
• Protein: 75 mg/dL (mildly elevated; normal <45 mg/dL)
• Sugar: 65 mg/dL (normal; CSF glucose normal = ~60-80% of blood glucose)
• Chlorides: 700 mg/dL (normal; normal = 700-750 mg/dL)
• Cell count: 10 cells/cu.mm
• Most cells are lymphocytes

• Key pointer: Normal glucose + lymphocytic pleocytosis + mild protein rise + absent coagulum + colourless CSF = viral meningitis pattern

1. Enteroviruses (most common - Echovirus, Coxsackievirus A & B) - account for >85% of viral meningitis
2. Herpes Simplex Virus (HSV-2) - in adults; HSV-1 more commonly causes encephalitis
3. Mumps virus - classic cause in unvaccinated children
4. Arbovirus (mosquito-borne - Japanese Encephalitis, West Nile virus)
5. HIV (at time of primary infection)
6. In neonates: HSV, CMV, Rubella, Toxoplasma (TORCH)

CASE 34 - CSF Interpretation: Bacterial (Pyogenic) Meningitis [Slide 4/37]

• Appearance: Purulent (frank pus = highly characteristic)
• Protein: 90 mg/dL (elevated)
• Sugar: 10 mg/dL (very low; normal 60-80 mg/dL)
• Culture Study: Positive
• TLC: 8000 cells/µL (very high)
• DLC: Neutrophils 96%, Lymphocytes 2%, Monocytes 2% (neutrophilic pleocytosis)

• Purulent appearance + markedly elevated neutrophils (96%) + very low sugar (10 mg/dL) + positive culture = textbook bacterial meningitis

1. Gram stain of CSF - immediate; identify organism and guide empirical antibiotics:
   • Gram-positive diplococci = S. pneumoniae
   • Gram-negative diplococci (intracellular) = N. meningitidis
   • Gram-positive rods = Listeria
2. CSF culture and sensitivity - gold standard (already positive here); identify specific organism + antibiotic sensitivity pattern
3. Blood culture (x2, before antibiotics) - bacteremia common in meningitis
4. Latex agglutination / CIE (Countercurrent Immunoelectrophoresis) - rapid antigen detection for S. pneumoniae, N. meningitidis, H. influenzae
5. CBC with differential - peripheral leukocytosis with neutrophilia confirms systemic infection
6. CT head - before LP if papilledema/focal neurological signs (to rule out raised ICP)

CASE 35 - Hepatocellular (Hepatitis A) Jaundice [Slide 2/37]

• Total Bilirubin: 8.6 mg/dL; Direct Bilirubin: 4.2 mg/dL; Indirect Bilirubin: 4.4 mg/dL (mixed, slightly indirect predominant but both elevated)
• AST (SGOT): 980 U/L; ALT (SGPT): 1240 U/L (markedly elevated - hepatocellular damage)
• ALP: 180 U/L (mildly elevated)
• Serum albumin: 3.6 g/dL (mildly low)
• Prothrombin time: Mildly prolonged
• Urine bile pigments: Present (conjugated bilirubin in urine)
• Serology: HBsAg: Negative; Anti-HAV IgM: Positive
• USG: Mild hepatomegaly, normal biliary tree

• Hepatocellular (Hepatic) Jaundice
• Supporting evidence:
  1. Markedly elevated AST (980) and ALT (1240) - hallmark of hepatocyte necrosis; ALT > AST = viral hepatitis
  2. Both conjugated and unconjugated bilirubin elevated (mixed hyperbilirubinemia - damaged hepatocytes cannot conjugate OR excrete properly)
  3. Urine bile pigments present (conjugated fraction spills into urine)
  4. Mildly prolonged PT (hepatocyte synthetic function impaired)
  5. Normal biliary tree on USG - rules out obstructive jaundice
  6. No pale stools (some bilirubin still reaches gut, unlike complete obstruction)
  7. ALP only mildly elevated (contrast with obstructive jaundice where ALP is markedly elevated)

• Hepatitis A Virus (HAV) infection
• Evidence: Anti-HAV IgM Positive (diagnostic of acute HAV infection)
• HBsAg Negative (rules out Hepatitis B)
• Epidemiological clues: roadside food consumption (feco-oral route), family cluster, young adult age, self-limiting course
• HAV: RNA virus, Picornavirus family, feco-oral transmission, NO chronic carrier state

CASE 36 - Hemolytic Jaundice [Slide 3/37]

• Hb: 7.6 g/dL (anemia)
• Total Bilirubin: 6.4 mg/dL; Direct Bilirubin: 0.7 mg/dL; Indirect Bilirubin: 5.7 mg/dL (predominantly unconjugated)
• AST: 36 U/L; ALT: 30 U/L (normal transaminases)
• ALP: 102 U/L (normal)
• Reticulocyte count: 10% (markedly elevated = regenerative/hemolytic anemia)
• LDH: 750 IU/L (elevated - from RBC destruction)
• Urine bile pigments: Absent (unconjugated bilirubin is water-insoluble, NOT excreted in urine)
• Urine urobilinogen: Increased
• Peripheral smear: Sickle-shaped RBCs + Target cells + Polychromasia

• Hemolytic (Pre-hepatic) Jaundice
• Supporting evidence:
  1. Predominantly unconjugated/indirect hyperbilirubinemia (5.7/6.4 = >88% indirect)
  2. Urine bile pigments ABSENT (acholuric jaundice - unconjugated bilirubin is albumin-bound, not water-soluble, cannot be filtered by kidneys)
  3. Urine urobilinogen INCREASED (excess bilirubin reaches gut → excess urobilinogen → excess reabsorbed → excreted in urine)
  4. High reticulocyte count (10%) - compensatory erythropoiesis from hemolysis
  5. Elevated LDH (released from lysed RBCs)
  6. Normal AST, ALT, ALP - liver is functioning normally, just overloaded with bilirubin
  7. Splenomegaly (site of extravascular hemolysis; extramedullary hematopoiesis)
  8. Bone pain (tibia, femur) - marrow expansion from chronic compensatory erythropoiesis
  9. Multiple childhood blood transfusions - chronic hemolytic disease since childhood
  10. Sickle cells on smear - confirms hemolytic etiology

• Sickle Cell Disease (Hemoglobin SS / Sickle Cell Anemia)
• Evidence: Sickle-shaped RBCs + target cells on peripheral smear + chronic hemolysis since childhood + bone pain (vaso-occlusion in medullary bones) + splenomegaly

CASE 37 - Liver Cirrhosis (Alcoholic) [Slide 1/37]

• Hb: 12 g/dL (mild anemia); ESR: 20 mm/hr
• SGOT: 52 U/L; SGPT: 50 U/L (mildly elevated; note SGOT > SGPT in alcoholic liver disease - ratio >2:1)
• ALP: 149 U/L (elevated)
• Albumin: 3.1 g/dL (low; normal 3.5-5.25 g/dL = impaired synthetic function)
• Globulin: 2.31 g/dL
• BUN: 12 mg/dL; Creatinine: 0.7 mg/dL (normal renal function)

• Alcoholic chronic liver disease → cirrhosis → low albumin (ascites, edema), hepatocellular dysfunction, weight loss, weakness

• Macrovesicular fat (large lipid droplet displacing nucleus to periphery) in hepatocytes
• Entire lobule affected (zone 3/centrilobular most prominent)
• Reversible with abstinence

• Mallory-Denk bodies (Mallory's hyaline) - eosinophilic cytoplasmic inclusions of keratin filaments in ballooned hepatocytes; pathognomonic of alcoholic hepatitis
• Hepatocyte ballooning degeneration (cell swelling, pale cytoplasm)
• Neutrophilic infiltration (lobular inflammation; perivenular)
• Centrilobular necrosis
• Pericellular/perisinusoidal fibrosis ("chicken wire" fibrosis around central vein)

• Micronodular cirrhosis (initially) - all nodules uniformly small (<3 mm), separated by thin fibrous septa; "hobnail liver"
• Diffuse regenerative nodules surrounded by fibrous bands
• Loss of normal lobular architecture
• Portal hypertension features: splenomegaly, ascites, varices

1. Liver disease (hepatitis → cirrhosis → fulminant hepatic failure; in young patients)
2. Neuropsychiatric manifestations (dysarthria, tremor, dystonia, psychiatric symptoms - depression, psychosis)
3. Kayser-Fleischer rings (golden-brown copper deposits in Descemet's membrane of cornea; seen on slit-lamp examination; pathognomonic)

Additional diagnostics: Low serum ceruloplasmin (<20 mg/dL), elevated 24-hr urine copper, elevated hepatic copper on liver biopsy

Note: Micronodular cirrhosis may convert to macronodular over time with ongoing regeneration.

Quick Exam Tip Sheet (Set 4)

Gross Pathology Specimens - Viva Points (2nd Year MBBS)

1. CHRONIC CHOLECYSTITIS with Gallstones (GIT 11 & GIT 21)

• Shrunken, thickened gallbladder wall (fibrosed)
• Pale/tan-white, firm wall
• Small oval/round stone(s) visible at the bottom of the jar (GIT 11 = smaller stone; GIT 21 = larger yellowish stone)

• Organ: Gallbladder (surgically removed - cholecystectomy specimen)
• Type of stone: Most likely cholesterol stone (yellow, oval, solitary) OR pigment stone (dark, multiple, faceted)
• Wall: Thickened and fibrosed due to repeated episodes of inflammation
• Why thickened? Repeated mucosal damage → inflammation → fibrosis → Rokitansky-Aschoff sinuses (glands penetrate into muscle wall)
• Cause: Gallstones (cholelithiasis) → obstruct cystic duct → repeated acute inflammation → chronic cholecystitis
• Most common stone type worldwide: Cholesterol (females, fat, fertile, forty, fair = 5Fs)
• Complication to mention: Carcinoma gallbladder (porcelain gallbladder - calcified wall = pre-malignant)
• Key fact: Most common cause of acute abdomen in females is biliary colic from gallstones

2. CVC SPLEEN - Chronic Venous Congestion (LS 08 & LS 10)

• Enlarged, firm spleen (splenomegaly)
• Cut surface: dark reddish-brown, congested
• Capsule appears thickened and wrinkled (fibrosed)
• Trabecular pattern visible

• Organ: Spleen
• Diagnosis: Chronic Venous Congestion (CVC) of spleen = Congestive Splenomegaly
• Gross features to say:
  • Enlarged (normal spleen = 150 g; CVC spleen = up to 500 g)
  • Dark, congested cut surface ("port wine" appearance)
  • Thickened fibrous capsule
• Causes: Right heart failure → ↑ venous pressure → hepatic congestion → portal hypertension → splenic congestion
  • Portal hypertension (cirrhosis of liver - most common cause in India)
  • Congestive heart failure (right-sided)
  • Budd-Chiari syndrome
• Microscopic (Gandy-Gamna bodies): Hemosiderin + calcium + fibrous deposits = pathognomonic of CVC spleen
• Key term: Banti's syndrome = portal hypertension + congestive splenomegaly + hypersplenism

3. LEIOMYOMA (FGT 52 & FGT 23)

• Multiple firm, white-grey, well-circumscribed rounded nodules in/on the uterus
• Cut surface: whorled/trabecular pattern (classic!)
• Well-defined capsule-like border
• No necrosis or hemorrhage (benign)

• Organ: Uterus
• Diagnosis: Leiomyoma (Fibroid uterus) - benign tumor of smooth muscle
• Most common tumor of female genital tract
• Most common benign tumor in women of reproductive age (35-45 years)
• Types by location:
  • Intramural (most common - within muscle)
  • Subserosal (outer surface - may become pedunculated)
  • Submucosal (causes maximum bleeding)
• Key gross feature: Firm, white, whorled cut surface - this is the one thing examiners always ask
• Hormone dependence: Estrogen-dependent → grows in reproductive age, shrinks after menopause
• Malignant counterpart: Leiomyosarcoma (only 0.1% transform)
• Complications: Menorrhagia (most common symptom), infertility, pressure symptoms, red degeneration in pregnancy

4. LEIOMYOSARCOMA (FGT 81 & FGT 32)

• Large, irregularly shaped mass from uterus
• Cut surface: necrotic, hemorrhagic areas (yellow-brown necrotic zones)
• Poorly defined borders (no clear capsule)
• Soft, fleshy texture with areas of degeneration
• FGT 32: shows necrotic tissue + green/black areas (necrosis + hemorrhage)

• Organ: Uterus
• Diagnosis: Leiomyosarcoma - malignant smooth muscle tumor
• Compare with Leiomyoma:

• Key gross feature to say: Necrosis + hemorrhage + poorly defined margins = malignant
• Spread: Hematogenous (bloodstream) primarily - to lungs
• Prognosis: Poor; high rate of recurrence

5. HYDATID CYST (LS 05 & LS 03)

• Thin, white, laminated/membranous cyst wall
• Collapsed/opened cyst membrane - pearly white, glistening
• LS 05: flat, thin membrane; LS 03: folded, multi-layered white membrane
• Translucent, gelatinous appearance

• Organ: Most commonly liver (also lung, spleen, bone)
• Diagnosis: Hydatid Cyst - caused by Echinococcus granulosus (dog tapeworm)
• Cyst wall layers (3 layers - must memorize):
  1. Pericyst - outer, host-derived fibrous layer
  2. Ectocyst (Laminated membrane) - outer, acellular, white, laminated - what you see here
  3. Endocyst (Germinal layer) - inner, living, scolices-producing layer
• Hydatid sand: Scolices + daughter cysts inside = pathognomonic
• Key fact: Laminated/onion-skin appearance of cyst wall = characteristic
• Danger: NEVER aspirate without precaution - anaphylactic shock from spillage of cyst fluid
• Diagnosis: USG + Casoni test (skin test) + serology (ELISA)
• Treatment: PAIR procedure (Puncture, Aspiration, Injection of hypertonic saline, Re-aspiration) OR surgical enucleation

6. SEMINOMA (MGT 5)

• Bisected testis - enlarged
• Cut surface: homogeneous, creamy-white, lobulated mass
• Well-defined, solid, no necrosis or hemorrhage (classically)
• Smooth, fish-flesh appearance
• Normal testis replaced by tumor

• Organ: Testis
• Diagnosis: Seminoma - most common testicular germ cell tumor
• Age group: 30-40 years (compare: embryonal carcinoma = 20-30 years; yolk sac = children)
• Key gross features:
  • Homogeneous cut surface (unlike teratoma which is heterogeneous)
  • Creamy-white / fish-flesh appearance
  • Well-circumscribed
  • NO necrosis or hemorrhage (contrast with non-seminomatous tumors)
• Tumor marker: PLAP (Placental Alkaline Phosphatase) - raised in seminoma; AFP and beta-hCG are usually NORMAL (if elevated = non-seminomatous component)
• Most radiosensitive testicular tumor
• Best prognosis among testicular tumors
• Risk factor: Cryptorchidism (undescended testis) - most important risk factor; 40x increased risk

7. CARCINOMA PENIS (Ca Penis) (MGT 08)

• Penile tissue with irregular, ulcero-proliferative growth
• Whitish-grey, firm, irregular mass
• Areas of ulceration and necrosis visible
• Glans/foreskin area predominantly involved

• Organ: Penis (surgical amputation specimen - penectomy)
• Diagnosis: Carcinoma Penis = Squamous Cell Carcinoma (almost 100% are SCC)
• Site: Glans penis and inner surface of prepuce (most common)
• Risk factors:
  1. Poor hygiene / smegma accumulation (most common cause)
  2. HPV infection (types 16, 18) - most important viral factor
  3. Phimosis (non-retractile foreskin)
  4. Circumcision is PROTECTIVE (key exam point - Jews/Muslims have very low incidence)
• Pre-malignant lesions:
  • Erythroplasia of Queyrat (carcinoma in situ of glans)
  • Bowen's disease (carcinoma in situ of shaft skin)
  • Bowenoid papulosis (HPV-related)
• Spread: Lymphatics → inguinal lymph nodes first
• Gross: Ulcero-proliferative, squamous carcinoma = white/grey, firm, irregular edges

8. FIBROADENOMA (Breast) (BR 11 & BR 04)

• BR 11: Small, firm, well-encapsulated, round/oval nodule - smooth surface
• BR 04: Larger, lobulated, pale-white, well-defined mass; BR 04 shows characteristic leaf-like projections (lobulated surface)
• Cut surface: white, firm, slit-like spaces possible

• Organ: Breast
• Diagnosis: Fibroadenoma - most common benign breast tumor
• Most common breast lump in young women (15-35 years)
• Key features to say:
  • Well-encapsulated, freely mobile (called "breast mouse" clinically)
  • Smooth, bosselated surface
  • Firm, rubbery consistency
  • NOT attached to overlying skin or underlying muscle (unlike carcinoma)
  • White, whorled cut surface with slit-like spaces (compressed ducts)
• Two microscopic patterns:
  • Intracanalicular - stroma compresses ducts into slits
  • Pericanalicular - stroma surrounds ducts (ducts remain open/round)
• Hormone dependence: Estrogen-dependent → increases in pregnancy; involutes after menopause
• Malignant potential: Very rare (<0.1%)
• Giant fibroadenoma: >5 cm = Phyllodes tumor (not same as fibroadenoma; Phyllodes = "leaf-like", borderline/malignant potential)

9. CPN - Chronic Pyelonephritis (US 04)

• Bisected kidney
• Multiple cystic spaces / cavities (abscess cavities or dilated calyces)
• Thickened, scarred cortex
• Yellow-brown material filling some spaces (pus/debris)
• Irregular surface with cortical scarring
• Dilated pelvis and calyces (hydronephrosis component)

• Organ: Kidney (nephrectomy specimen)
• Diagnosis: Chronic Pyelonephritis (CPN) - chronic bacterial infection of kidney
• Key gross features:
  • Irregular, coarse cortical scars overlying dilated calyces (calyceal clubbing)
  • "Thyroid-like" or "corticomedullary scarring" pattern
  • Dilated, distorted calyces
  • Thinned cortex
  • Pus/debris in collecting system
• Hallmark: U-shaped scar = cortical scar + underlying dilated calyx (pathognomonic of CPN)
• Cause: Repeated urinary tract infections (UTI), vesico-ureteric reflux (VUR) - most common in children
• Most common organism: E. coli (gram-negative)
• Xanthogranulomatous pyelonephritis: Yellow mass in kidney with foam cells; can mimic renal cell carcinoma
• Complications: Renal failure, hypertension, pyonephrosis

10. LIPOMA (SFT 05 & SFT 08)

• SFT 05: Bisected, bright yellow, uniform, lobulated soft tissue mass; thin fibrous septa visible
• SFT 08: Larger, bright yellow, irregular, lobulated mass with fibrous strands running through it
• Characteristic butter-yellow color throughout
• Soft, greasy cut surface

• Origin: Soft tissue (subcutaneous fat)
• Diagnosis: Lipoma - benign tumor of adipocytes (fat cells)
• Most common benign soft tissue tumor
• Key gross features:
  • Bright yellow / butter-yellow color (most striking feature)
  • Soft, greasy to touch
  • Well-encapsulated, lobulated
  • Fibrous septa dividing it into lobules
  • Homogeneous yellow throughout (no necrosis, no hemorrhage)
• Sites: Subcutaneous tissue of back, shoulder, neck, abdomen
• Variants: Fibrolipoma, Angiolipoma (painful), Hibernoma (brown fat), Myelolipoma
• Malignant counterpart: Liposarcoma (do NOT confuse)
• Difference from Liposarcoma:

Quick Viva Master Table

Gross Pathology Specimens - Viva Points (Set 2)

1. FOLLICULAR ADENOMA - Thyroid (THY 20)

• Bisected thyroid lobe with a solitary, well-encapsulated, round nodule
• Tan-brown / brownish-grey cut surface
• Complete fibrous capsule surrounding the nodule (distinct from surrounding thyroid tissue)
• Homogeneous solid cut surface; no necrosis

• Organ: Thyroid gland
• Diagnosis: Follicular Adenoma - most common benign thyroid tumor
• Key gross feature: Solitary + well-encapsulated + complete intact capsule - the capsule is the most important feature to mention
• What separates it from Follicular Carcinoma?
  • Adenoma = complete intact capsule, NO capsular invasion, NO vascular invasion
  • Carcinoma = capsular invasion + vascular invasion (only diagnosed on microscopy - cannot tell on gross alone!)
• Functional status: May be non-functioning ("cold nodule" on thyroid scan) or rarely hyperfunctioning ("hot nodule" = toxic adenoma)
• Tumor marker: None specific; Thyroid function tests; FNAC + histology for diagnosis
• Key exam fact: You CANNOT differentiate follicular adenoma from follicular carcinoma on FNAC - requires surgical excision and histology
• Malignant counterpart: Follicular Carcinoma of thyroid (hematogenous spread - bone, lung)

2. MULTINODULAR GOITER - Thyroid (THY 06 & THY 09)

• Enlarged thyroid gland with multiple nodules of varying sizes
• Cut surface: heterogeneous - areas of colloid (glistening, translucent, brown), fibrosis, cystic change, hemorrhage, calcification
• No single dominant nodule; nodules of different sizes
• THY 06: multiple nodules, brownish with cystic areas
• THY 09: larger, multinodular with extensive nodule formation

• Organ: Thyroid gland (thyroidectomy specimen)
• Diagnosis: Multinodular Goiter (MNG) / Non-toxic Multinodular Goiter
• Definition: Enlargement of thyroid with multiple nodules due to repeated episodes of hyperplasia and involution
• Key gross features to say:
  • Asymmetrically enlarged thyroid
  • Multiple nodules of varying sizes
  • Heterogeneous cut surface = colloid + fibrosis + cystic change + hemorrhage + calcification
• Pathogenesis: Iodine deficiency → low T3/T4 → TSH rises → thyroid hyperplasia → repeated cycles → nodule formation
• Most common cause of goiter in India: Iodine deficiency (endemic goiter)
• Complications (must know):
  1. Pressure symptoms - tracheal compression (stridor), dysphagia, SVC obstruction
  2. Retrosternal extension
  3. Secondary hyperthyroidism (Plummer's disease)
  4. Malignant transformation (rare, ~1%)
• Difference from Graves' disease: MNG = multinodular + euthyroid/late hyperthyroid; Graves' = diffuse + hyperthyroid + exophthalmos + pretibial myxedema

3. PHYLLODES TUMOR - Breast (BR 20)

• Large, lobulated breast mass
• Cut surface: leaf-like clefts and projections (phyllodes = "leaf-like" in Greek) - characteristic!
• White-grey, firm background with irregular projections/fronds
• Larger than typical fibroadenoma; bosselated outer surface

• Organ: Breast
• Diagnosis: Phyllodes Tumor (Cystosarcoma Phyllodes)
• Origin: Fibroepithelial tumor - arises from periductal stroma
• Key gross feature: Leaf-like clefts on cut surface = pathognomonic - this is what makes it different from fibroadenoma
• Age group: Older women (40-50 years) compared to fibroadenoma (15-35 years)
• Classification (3 grades):
  1. Benign (most common, ~60%)
  2. Borderline
  3. Malignant (~15%) - high mitoses, stromal overgrowth, infiltrative border
• Compare with Fibroadenoma:

• Treatment: Wide local excision (wide margins needed to prevent recurrence)
• Key fact: Phyllodes = Greek for "leaf-like" - remember this for viva

4. INVASIVE DUCTAL CARCINOMA (IDC) - Breast (BR 13)

• Mastectomy specimen - sliced breast tissue
• Grey-white, hard, irregular mass with ill-defined borders
• Stellate / spiculated margins radiating into surrounding fat (like a star)
• Cut surface: gritty, chalky white streaks (due to fibrosis/desmoplasia)
• Dark areas of necrosis visible
• Skin and nipple involvement may be visible

• Organ: Breast (modified radical mastectomy specimen)
• Diagnosis: Invasive Ductal Carcinoma (IDC) = now called Invasive Carcinoma of No Special Type (NST)
• Most common breast carcinoma (70-80% of all breast cancers)
• Key gross features:
  • Hard, gritty cut surface (desmoplastic stroma - fibrous reaction = "scirrhous carcinoma")
  • Stellate/spiculated borders - infiltrating into fat
  • Chalky white streaks = elastosis and calcification
  • "Crablike" cut surface - hence cancer (Greek: karkinos = crab)
• Risk factors (must know): BRCA1/BRCA2 mutation, family history, early menarche/late menopause, nulliparity, HRT, previous breast cancer, atypical hyperplasia
• Spread:
  • Lymphatics → axillary lymph nodes (most common)
  • Hematogenous → bone (most common), lung, liver, brain
• Tumor markers: ER/PR (estrogen/progesterone receptor) + HER2/neu (IHC) - guide treatment
• Peau d'orange: Skin edema due to blocked lymphatics → dimpling like orange peel (clinical sign)
• Important clinical signs: Nipple retraction, skin fixation, Paget's disease of nipple

5. CARCINOMA CERVIX (Ca Cervix) (FGT 8)

• Bisected uterus with cervix
• Irregular, white, firm, ulcero-proliferative growth at the cervix (ectocervix)
• Tumor replacing the cervical lips
• Friable, necrotic tissue at the cervical os
• Small polypoid/papillary fragments visible at right side

• Organ: Uterus + cervix (total hysterectomy specimen)
• Diagnosis: Carcinoma Cervix = Squamous Cell Carcinoma (most common type, ~80%)
• Most common gynecological cancer in India (worldwide 2nd after endometrial in developed countries)
• Site: Transformation zone / squamocolumnar junction (where SCC joins columnar epithelium) = most common site
• Key risk factor: HPV infection (types 16 and 18) - most important (>99% cases HPV-associated)
  • HPV 16 = SCC
  • HPV 18 = Adenocarcinoma
• Other risk factors: Early age of first intercourse, multiple sexual partners, multiparity, immunosuppression, smoking
• Precursor lesion: CIN (Cervical Intraepithelial Neoplasia) → CIN 1 → CIN 2 → CIN 3 → Invasive carcinoma
• Screening: Pap smear (Papanicolaou stain) - best screening test; can detect CIN before invasion
• Spread: Direct extension (bladder, rectum), lymphatics (iliac, obturator nodes)
• Vaccination: HPV vaccine (Gardasil/Cervarix) prevents HPV 16/18 infection

6. CARCINOMA ENDOMETRIUM (Ca Endometrium) (FGT 7)

• Bisected uterus
• Irregular, white-tan, polypoid/fungating growth filling the endometrial cavity
• Endometrium replaced by friable, grey-white tumor tissue
• Myometrium shows tumor infiltration (depth of invasion determines staging)
• Polypoid masses protruding into the uterine cavity

• Organ: Uterus (hysterectomy specimen)
• Diagnosis: Carcinoma Endometrium = Endometrial Adenocarcinoma (most common type)
• Most common gynecological cancer in developed countries
• Two types (Type I vs Type II):

• Risk factors (Type I - estrogen excess): Obesity (fat → estrogen), nulliparity, late menopause, PCOS, Tamoxifen use, Diabetes, Hypertension → "HONDA" mnemonic
• Key symptom: Postmenopausal bleeding (PMB) = carcinoma endometrium until proven otherwise
• Key gross feature: Polypoid, friable mass filling uterine cavity; assess depth of myometrial invasion
• Most important prognostic factor: Depth of myometrial invasion (>50% = poor prognosis)
• Screening: No routine screening; D&C / Endometrial biopsy for diagnosis

7. RENAL CELL CARCINOMA (RCC) (US 05)

• Bisected kidney
• Large, variegated (multicolored) mass in the upper pole
• Areas of yellow (lipid-rich tumor cells), grey-white, red (hemorrhage), and dark brown/black (necrosis)
• "Golden yellow" areas = characteristic of clear cell RCC (high lipid content)
• Tumor bulging through renal capsule; distorts normal renal architecture
• Lower portion shows normal renal parenchyma + perirenal fat

• Organ: Kidney (nephrectomy specimen)
• Diagnosis: Renal Cell Carcinoma (RCC) = Hypernephroma / Grawitz tumor
• Most common renal malignancy in adults (90% of all kidney cancers)
• Most common type: Clear Cell RCC (75%) - cells rich in glycogen and lipids → look clear on H&E
• Key gross features:
  • Variegated cut surface = yellow + grey + red + brown areas (hallmark!)
  • "Golden yellow" color from lipid-laden tumor cells - classic for RCC
  • Upper pole location common
  • Pseudocapsule (compressed normal tissue)
• Classic triad (only in 10% patients!):
  1. Painless hematuria
  2. Flank pain
  3. Palpable flank mass
• Called "Internist's tumor" / "Great Masquerader" - presents with paraneoplastic syndromes:
  • Polycythemia (ectopic EPO), Hypercalcemia (PTHrP), Cushing's syndrome (ACTH), Hypertension (renin)
• Spread: Tumor thrombus into renal vein → IVC → right heart (important!)
• Risk factors: Von Hippel-Lindau (VHL) disease (bilateral RCC), smoking, obesity, hypertension
• Gene mutation: VHL gene on chromosome 3p (most common)

8. MUCINOUS CYSTADENOMA - Ovary (FGT 93)

• Large, multiloculated cystic ovarian mass
• Multiple cysts/locules of varying sizes separated by thin septa
• Contents appear pale/translucent (mucin/gelatinous material)
• White-grey, smooth outer surface
• Thin walls; no solid areas (benign)

• Organ: Ovary
• Diagnosis: Mucinous Cystadenoma - most common large ovarian cyst; can be enormous
• Most common large ovarian tumor - can reach >30 kg!
• Key gross features:
  • Multiloculated (multiple cyst locules) - very characteristic
  • Thin fibrous septa between locules
  • Filled with thick, sticky, mucin (clear to pale yellowish gelatinous fluid)
  • Smooth outer surface (no papillary projections = benign)
• Compare with Serous Cystadenoma:

• Complication: Pseudomyxoma peritonei - if mucinous cystadenoma/carcinoma ruptures → mucin fills peritoneal cavity → "jelly belly" appearance
• Malignant counterpart: Mucinous Cystadenocarcinoma (solid areas + papillary projections + thick septa)
• Tumor marker: CA 19-9 (mucinous tumors); CA 125 (serous tumors)

9. HYDATIDIFORM MOLE (H. Mole) (FGT 57)

• Specimen jar filled with multiple grape-like clusters of vesicles
• Small, translucent, round, fluid-filled vesicles resembling "bunch of grapes"
• Pale/white-tan, glistening vesicles of varying sizes
• No fetal parts visible (complete mole)

• Organ: Products of conception (uterine contents)
• Diagnosis: Hydatidiform Mole (Complete Mole) = gestational trophoblastic disease
• Key gross feature: "Bunch of grapes" appearance - the single most important feature
• Two types:

• Complete mole: Paternal only chromosomes (46XX) - 2 sperms + empty ovum (no maternal contribution)
• Tumor marker: beta-hCG (highly elevated) - used for diagnosis AND follow-up
• Complications:
  1. Choriocarcinoma (most feared - 2-3% of complete moles)
  2. Persistent/invasive mole
  3. Theca-lutein cysts (bilateral, due to hCG stimulation)
• Clinical symptoms: Uterus larger than dates, hyperemesis, preeclampsia before 20 weeks, "snowstorm" pattern on USG
• Treatment: Suction evacuation + follow-up hCG levels (should fall to zero)
• Never give blood transfusion before evacuation (causes luteal cyst complications)

10. TERATOMA OF OVARY (FGT 51)

• Bisected ovarian mass
• Heterogeneous contents: Yellow areas (sebaceous/fat material), dark brown/black areas (hair/keratin), round smooth surfaces (skin cyst)
• Multiple tissue types visible - solid + cystic areas
• "Dermoid plug" / Rokitansky protuberance visible (solid area from which hair/teeth arise)

• Organ: Ovary
• Diagnosis: Mature Cystic Teratoma (Dermoid Cyst) = most common benign ovarian germ cell tumor
• Most common ovarian tumor in women under 30 years
• Key gross feature: Contains derivatives of all 3 germ layers:
  • Ectoderm: Skin, hair, sebaceous glands, teeth (most common/prominent)
  • Mesoderm: Bone, cartilage, muscle, fat
  • Endoderm: Respiratory/GI epithelium, thyroid tissue
• Rokitansky protuberance (dermoid plug): Solid nodule on inner wall where teeth and hair arise - pathognomonic
• Key fact: Most common contents = hair + sebaceous material (the yellow material you see)
• Bilateral: 10-15% cases
• Complications:
  1. Torsion (most common complication due to heavy weight)
  2. Rupture → chemical peritonitis
  3. Malignant transformation (~1-2%) → Squamous Cell Carcinoma arising from dermoid
• Malignant counterpart: Immature Teratoma (contains immature/embryonic tissue; neuroepithelium predominates)
• Struma ovarii: Teratoma where >50% tissue is thyroid → can cause hyperthyroidism

Quick Viva Master Table (Set 2)