Renal Pathology — MCQs

Renal Pathology Indian Medical PG Practice Questions and MCQs

Question 91: Red cell casts are most commonly associated with which of the following conditions?

A. Acute tubular necrosis
B. Nephrotic syndrome
C. Nephritic syndrome (Correct Answer)
D. Interstitial nephritis

Explanation: **Explanation:** **Red cell casts** are the hallmark of **Nephritic Syndrome (Glomerulonephritis)**. Their presence indicates bleeding originating from the glomerulus rather than the lower urinary tract [1]. When the glomerular filtration barrier is damaged (as seen in conditions like Post-streptococcal Glomerulonephritis or IgA Nephropathy), RBCs leak into the nephron [1]. As they pass through the distal convoluted tubule and collecting ducts, they are trapped within a matrix of **Tamm-Horsfall protein**, forming cylindrical casts that are subsequently excreted in the urine. **Analysis of Incorrect Options:** * **A. Acute Tubular Necrosis (ATN):** Characterized by **"Muddy brown" granular casts** or epithelial cell casts due to the sloughing of necrotic tubular cells [1]. * **B. Nephrotic Syndrome:** Typically presents with **Fatty casts**, "Maltese cross" appearance under polarized light (due to lipiduria), and oval fat bodies. * **C. Interstitial Nephritis:** Classically associated with **WBC casts** (specifically eosinophils in drug-induced cases) and sterile pyuria. **High-Yield Clinical Pearls for NEET-PG:** * **RBC Casts = Glomerular Hematuria:** Always look for dysmorphic RBCs (acanthocytes) on microscopy alongside these casts. * **WBC Casts:** Suggest Pyelonephritis or Interstitial Nephritis (helps differentiate upper UTI from lower UTI/Cystitis). * **Waxy Casts:** Seen in Chronic Renal Failure (represent advanced tubular atrophy). * **Hyaline Casts:** Non-specific; can be seen in normal concentrated urine, dehydration, or after vigorous exercise [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 520-521.

Question 92: Histopathologic examination of glomeruli shows crescents. This finding is characteristic of which of the following conditions?

A. Minimal change disease
B. Rapidly progressive glomerulonephritis (Correct Answer)
C. Membranous glomerulonephritis
D. Membranoproliferative glomerulonephritis

Explanation: **Explanation:** **Rapidly Progressive Glomerulonephritis (RPGN)** is the correct answer because the hallmark histopathological feature of this condition is the presence of **crescents** in the majority of glomeruli (usually >50%) [1]. **Pathophysiology of Crescents:** Crescents are formed by the proliferation of **parietal epithelial cells** of Bowman’s space and the infiltration of **monocytes/macrophages** [1]. This occurs in response to severe glomerular capillary wall injury, which allows plasma proteins (like fibrin) to leak into the urinary space [1]. Over time, these cellular crescents undergo fibrosis, leading to permanent glomerular scarring and rapid loss of renal function. **Analysis of Incorrect Options:** * **Minimal Change Disease (MCD):** Glomeruli appear normal under light microscopy. The characteristic finding is the effacement of podocyte foot processes, visible only on electron microscopy. * **Membranous Glomerulonephritis (MGN):** Characterized by diffuse thickening of the glomerular capillary wall due to subepithelial deposits, often showing a "spike and dome" pattern on silver stain. * **Membranoproliferative Glomerulonephritis (MPGN):** Characterized by a "double contour" or "tram-track" appearance of the basement membrane due to mesangial cell interposition [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Immunofluorescence (IF) Patterns in RPGN:** * **Type I (Anti-GBM):** Linear IgG deposits (e.g., Goodpasture Syndrome). * **Type II (Immune Complex):** Granular deposits (e.g., PSGN, SLE). * **Type III (Pauci-immune):** Little to no IF staining; associated with ANCA-positive vasculitides (e.g., Granulomatosis with polyangiitis) [2]. * **Key Component:** Fibrin is the most important protein found within the crescents [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 528-529. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 917-918. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 925-926.

Question 93: Which of the following pathological processes is responsible for acute glomerulonephritis?

A. Vascular thrombosis
B. Immune complex disease (Correct Answer)
C. Infective
D. Neoplastic

Explanation: Acute Glomerulonephritis (AGN) is primarily an **immunologically mediated** inflammatory disease of the renal glomeruli [1]. **Why Option B is Correct:** The hallmark of AGN (most classically Post-Streptococcal Glomerulonephritis or PSGN) is a **Type III Hypersensitivity reaction** [1]. This involves the formation of **immune complexes** (antigen-antibody aggregates) that circulate in the blood and deposit in the glomerular basement membrane (GBM) or form *in situ* [1][2]. These deposits trigger the complement cascade (classical and alternative pathways), leading to the recruitment of neutrophils and macrophages, resulting in glomerular injury, hypercellularity, and the clinical presentation of nephritic syndrome [2][3]. **Why Other Options are Incorrect:** * **A. Vascular thrombosis:** While thrombosis can occur in conditions like HUS or DIC (Thrombotic Microangiopathy), it is not the primary driver of acute glomerulonephritis. * **C. Infective:** Although AGN often follows an infection (e.g., Group A Beta-hemolytic Streptococcus), the damage to the kidney is **post-infectious** and immune-mediated, not due to direct invasion of the renal tissue by the pathogen itself [2]. * **D. Neoplastic:** Neoplasia refers to uncontrolled cell growth (cancer) and is not the mechanism for acute inflammatory glomerular diseases. **NEET-PG High-Yield Pearls:** * **Light Microscopy:** Shows "starry sky" appearance or diffuse hypercellularity [3]. * **Electron Microscopy:** Characterized by **"Subepithelial humps"** (immune complex deposits) [2][4]. * **Immunofluorescence:** Shows a **"lumpy-bumpy"** granular pattern of IgG and C3 [2][5]. * **Clinical Marker:** Low serum C3 levels are a classic finding in the acute phase of PSGN [5]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 214-215. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 915. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 915-916. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 911. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 911-913.

Question 94: Loss of 'Y' chromosome is associated with which of the following types of renal cell carcinoma (RCC)?

A. Clear cell RCC
B. Papillary RCC (Correct Answer)
C. Chromophobe RCC
D. Collecting duct RCC

Explanation: **Explanation:** The correct answer is **Papillary Renal Cell Carcinoma (RCC)**. **1. Why Papillary RCC is correct:** Papillary RCC is characterized by specific cytogenetic abnormalities. The most common genetic alterations include **trisomy of chromosomes 7 and 17** and the **loss of the Y chromosome** in males [1]. These changes are particularly characteristic of the sporadic (Type 1) form of the disease [1]. While trisomies are diagnostic hallmarks, the loss of the Y chromosome is a highly specific high-yield finding associated with this subtype. **2. Why the other options are incorrect:** * **Clear cell RCC:** This is the most common subtype (70-80%) and is primarily associated with the **deletion of the 3p chromosome** (containing the VHL gene) [1]. It is not typically associated with Y chromosome loss. * **Chromophobe RCC:** This subtype is characterized by **extreme hypodiploidy**, involving the concurrent loss of multiple entire chromosomes (1, 2, 6, 10, 13, 17, and 21) [1]. It has a better prognosis than clear cell RCC [1]. * **Collecting duct RCC:** This is a rare, highly aggressive tumor arising from the medulla. Its genetics are complex and distinct from the common cortical RCCs, often involving losses of 1q, 6p, 8p, and 21q. **3. High-Yield Facts for NEET-PG:** * **Clear Cell RCC:** Deletion 3p (VHL gene); most common; associated with Von Hippel-Lindau syndrome [1]. * **Papillary RCC:** Trisomy 7, 17 and Loss of Y; originates from proximal convoluted tubules [1]. * **Chromophobe RCC:** Multiple chromosome losses; shows "halo" around nuclei (koilocytic-like) and stains positive with **Hale’s Colloidal Iron** [1]. * **Translocation RCC:** Associated with **TFE3 gene** translocations; typically seen in younger patients [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 958-961.

Question 95: If a renal biopsy shows distinct crescents, what is the most likely diagnosis?

A. Rapidly progressive glomerulonephritis (RPGN) (Correct Answer)
B. Membranoproliferative glomerulonephritis (MPGN)
C. Post-streptococcal glomerulonephritis (PSGN)
D. Minimal change disease

Explanation: ### **Explanation** **1. Why RPGN is the Correct Answer:** Rapidly Progressive Glomerulonephritis (RPGN), also known as **Crescentic Glomerulonephritis**, is a clinical syndrome characterized by a rapid decline in renal function [1]. The hallmark pathological feature is the presence of **crescents** in the majority of glomeruli [4]. These crescents are formed by the proliferation of **parietal epithelial cells** and the migration of monocytes/macrophages into Bowman’s space, triggered by the leakage of fibrin through ruptured glomerular basement membranes [1]. **2. Why the Other Options are Incorrect:** * **MPGN:** Characterized by "tram-track" appearance due to basement membrane splitting and mesangial hypercellularity, not primary crescent formation. * **PSGN:** Typically shows "starry sky" or "lumpy-bumpy" appearance on immunofluorescence and subepithelial "humps" on electron microscopy [4]. While severe cases can progress to RPGN, it is not the defining feature [3]. * **Minimal Change Disease:** Shows normal glomeruli under light microscopy; the only significant finding is the effacement of podocyte foot processes on electron microscopy. **3. NEET-PG High-Yield Pearls:** * **Crescent Composition:** Fibrin + Parietal epithelial cells + Macrophages [1]. * **Classification of RPGN:** * **Type I:** Anti-GBM disease (e.g., Goodpasture syndrome) – Linear IgG deposits [2]. * **Type II:** Immune-complex mediated (e.g., SLE, PSGN) – Granular deposits. * **Type III:** Pauci-immune (e.g., Wegener’s/GPA, Microscopic polyangiitis) – ANCA associated, little to no immune deposition [5]. * **Key Marker:** Fibrin is the most important component within the crescent that signifies active injury [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 528-529. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 537-538. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 916-917. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 536-537. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 917-918.

Question 96: What is the most common cause of glomerulonephritis?

A. Post-streptococcal glomerulonephritis (Correct Answer)
B. Diabetes mellitus
C. Autosomal dominant polycystic kidney disease
D. Crescentric glomerulonephritis

Explanation: **Explanation:** **Post-streptococcal glomerulonephritis (PSGN)** is the most common cause of acute glomerulonephritis worldwide [1], particularly in children. It is a Type III hypersensitivity reaction occurring 1–4 weeks after a Group A Beta-hemolytic Streptococcal infection (pharyngitis or impetigo) [1]. The pathogenesis involves the deposition of immune complexes in the glomerular basement membrane, leading to the classic "lumpy-bumpy" appearance on immunofluorescence and subepithelial "humps" on electron microscopy [2]. **Analysis of Incorrect Options:** * **Diabetes Mellitus:** While it is the most common cause of **End-Stage Renal Disease (ESRD)** and Nephrotic syndrome (via Diabetic Nephropathy) in adults, it is a metabolic/vascular disease, not primarily classified as an acute glomerulonephritis. * **Autosomal Dominant Polycystic Kidney Disease (ADPKD):** This is the most common **hereditary** kidney disease. It is characterized by cyst formation and interstitial fibrosis rather than primary glomerular inflammation. * **Crescentic Glomerulonephritis (RPGN):** This is a clinical syndrome representing the most **severe** form of glomerular injury (characterized by rapid loss of renal function), but it is much rarer than PSGN [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Hallmark Presentation:** Nephritic syndrome (hematuria/coca-cola colored urine, hypertension, and periorbital edema) [2]. * **Serology:** Characterized by low serum **C3 levels** (which normalize in 6–8 weeks) and elevated ASO or Anti-DNase B titers. * **Light Microscopy:** Shows "Starry sky" appearance or diffuse proliferative glomerulonephritis with hypercellularity due to leukocyte infiltration [3]. * **Prognosis:** Excellent in children (>95% recover completely); more guarded in adults [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 914-915. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 915. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 915-916. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 916-917.

Question 97: IgA nephropathy is characterized by which of the following glomerular changes?

A. Membranoproliferative glomerulonephritis
B. Minimal change glomerulonephritis
C. Mesangioproliferative glomerulonephritis (Correct Answer)
D. Rapidly progressive glomerulonephritis type I

Explanation: ### Explanation **Correct Option: C. Mesangioproliferative glomerulonephritis** IgA Nephropathy (Berger’s Disease) is the most common primary glomerulonephritis worldwide. The hallmark of the disease is the deposition of **IgA-dominant immune complexes** in the **mesangium** of the glomerulus [1]. These deposits trigger the proliferation of mesangial cells and an increase in the mesangial matrix, leading to a **mesangioproliferative pattern** on light microscopy [1]. Immunofluorescence (IF) confirms the diagnosis by showing granular IgA and C3 deposits in the mesangium. **Analysis of Incorrect Options:** * **A. Membranoproliferative glomerulonephritis (MPGN):** Characterized by "tram-track" appearance due to basement membrane thickening and cellular interposition [3]. While IgA can sometimes show a proliferative pattern, the classic association is mesangioproliferative [1]. * **B. Minimal change glomerulonephritis (MCD):** Characterized by normal-appearing glomeruli under light microscopy and effacement of podocyte foot processes on electron microscopy [2]. It typically presents as nephrotic syndrome in children [2]. * **C. Rapidly progressive glomerulonephritis (RPGN) Type I:** This is Anti-GBM disease (e.g., Goodpasture syndrome), characterized by linear IgG deposits and crescent formation, not mesangial IgA deposits [4]. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Recurrent episodes of **gross hematuria** following an upper respiratory tract infection (Synpharyngitic hematuria). * **Oxford Classification (MEST-C Score):** Used for prognosis (Mesangial hypercellularity, Endocapillary hypercellularity, Segmental sclerosis, Tubular atrophy/interstitial fibrosis, and Crescents) [1]. * **Association:** Often associated with **Henoch-Schönlein Purpura (HSP)**, which is considered the systemic version of IgA nephropathy. * **Diagnosis:** Gold standard is **Renal Biopsy** showing mesangial IgA deposits on IF. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 535-536. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 925-926. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 915.

Question 98: Which of the following is rarely associated with renal cell carcinoma?

A. Polycythemia
B. Amyloidosis
C. Cushing's syndrome (Correct Answer)
D. Hypertension

Explanation: Renal Cell Carcinoma (RCC) is famously known as the **"Internist’s Tumor"** because of its frequent association with various paraneoplastic syndromes (PNS). These occur due to the ectopic production of hormones or cytokines by the tumor cells. **Why Cushing’s Syndrome is the correct answer:** While RCC can produce many hormones, the ectopic production of **ACTH** (leading to Cushing’s syndrome) is **extremely rare** in RCC. Cushing’s syndrome is more characteristically associated with Small Cell Carcinoma of the lung or Medullary Carcinoma of the thyroid [3]. **Analysis of Incorrect Options:** * **Polycythemia (Option A):** This is a classic PNS of RCC, occurring in about 5-10% of cases. It is caused by the ectopic secretion of **Erythropoietin (EPO)** [1]. * **Amyloidosis (Option B):** Chronic inflammation and tumor-related proteins in RCC can lead to **Secondary (AA) Amyloidosis**. While not a hormonal PNS, it is a recognized systemic complication of the malignancy. * **Hypertension (Option C):** This is common in RCC patients. It occurs due to the secretion of **Renin** by the tumor or due to compression of the renal artery (activating the RAAS pathway). **High-Yield Clinical Pearls for NEET-PG:** * **Most common PNS in RCC:** Hypercalcemia (due to PTHrP – Parathyroid Hormone-related Protein) [2]. * **Stauffer Syndrome:** Reversible hepatic dysfunction (elevated LFTs) in the absence of liver metastases; a unique feature of RCC. * **Classic Triad:** Hematuria, flank pain, and palpable mass (seen in only 10% of cases). * **Genetic Association:** Most clear cell RCCs are associated with deletions on **Chromosome 3p** (VHL gene). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 492-493. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 338-339. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 421-423.

Question 99: What is true about nephrogenic rest?

A. Associated with Wilm's tumor (Correct Answer)
B. Increased risk of Wilm's tumor in contralateral kidney
C. No association with Wilm's tumor
D. Abnormal embryonal renal tissue

Explanation: ### Explanation **Nephrogenic rests** are clusters of persistent embryonal cells (blastemal, stromal, or epithelial) that remain in the kidney beyond 36 weeks of gestation. They are considered **precursor lesions** for Wilms tumor (Nephroblastoma). #### 1. Why Option A is Correct Nephrogenic rests are found in approximately **35–40% of sporadic unilateral Wilms tumors** and nearly **100% of bilateral Wilms tumors**. Their presence indicates a field effect where a germline or early post-zygotic mutation (like *WT1*) has predisposed the renal tissue to neoplastic transformation [1]. #### 2. Analysis of Incorrect Options * **Option B:** While nephrogenic rests are associated with Wilms tumor, their presence in one kidney does not inherently "increase" the risk in the contralateral kidney unless they are **multifocal (Nephroblastomatosis)**. However, Option A is the most direct and universally accepted definition in pathology textbooks. [1] * **Option C:** This is factually incorrect; they are the recognized histological precursors to Wilms tumor. * **Option D:** While they are embryonal in origin, the term "abnormal embryonal renal tissue" is too vague. Specifically, they are **persistent** foci of normal fetal development that failed to disappear or mature. #### 3. NEET-PG High-Yield Pearls * **Nephroblastomatosis:** Defined as the presence of diffuse or multifocal nephrogenic rests. * **Syndromic Association:** They are frequently seen in overgrowth syndromes like **Beckwith-Wiedemann Syndrome** and **WAGR syndrome** [1]. * **Histological Types:** They are classified into **Intralobar** (associated with WAGR and Denys-Drash) and **Perilobar** (associated with Beckwith-Wiedemann). * **Clinical Significance:** If a pathologist identifies nephrogenic rests in a nephrectomy specimen for Wilms tumor, the patient requires rigorous screening of the contralateral kidney due to the risk of metachronous tumor development [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 487-490.

Question 100: On kidney biopsy, which of the following structures stains PAS-positive?

A. Glomerular basement membrane
B. Tubule (Correct Answer)
C. Neutrophils
D. Interstitium

Explanation: **Explanation:** Periodic Acid-Schiff (PAS) is a fundamental stain in renal pathology used to highlight structures rich in carbohydrates (glycogen) and glycoconjugates (mucopolysaccharides). **Why Option B is Correct:** In the kidney, the **brush border of the Proximal Convoluted Tubules (PCT)** is highly PAS-positive due to its dense glycocalyx. Additionally, the **tubular basement membranes (TBM)** stain intensely [2]. While the glomerular basement membrane is also PAS-positive [1], in the context of standard NEET-PG questions derived from standard textbooks (like Robbins), the "Tubule" (specifically the brush border and TBM) is the classic high-yield answer for demonstrating PAS positivity. **Analysis of Incorrect Options:** * **A. Glomerular Basement Membrane (GBM):** While the GBM is PAS-positive, it is much thinner than the tubular basement membrane [1]. In many exam scenarios, if both are present, the tubule is favored because the brush border provides a more robust and characteristic staining pattern. * **C. Neutrophils:** These do not typically show significant PAS positivity in renal sections. PAS is used to identify fungal elements or basement membrane thickening, not inflammatory cell infiltrates. * **D. Interstitium:** The renal interstitium consists of fibroblasts and extracellular matrix which do not stain intensely with PAS unless there is significant fibrosis or deposition of specific substances (like amyloid, which is actually PAS-negative/weak). **High-Yield Clinical Pearls for NEET-PG:** * **PAS Stain:** Best for visualizing the **Basement Membrane**, **Brush Border**, and **Mesangial Matrix** [1]. It is excellent for diagnosing Diabetic Nephropathy (Kimmelstiel-Wilson nodules are PAS-positive). * **Silver Stain (Jones Methenamine):** Best for visualizing "spikes" in Membranous Nephropathy or "double contours" (tram-tracking) in MPGN. * **Congo Red:** Used specifically for Amyloidosis (shows apple-green birefringence under polarized light). * **Rule of Thumb:** If a structure contains "Basement Membrane" or "Glycogen," think PAS. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 522-523. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1121.

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