Renal Pathology — MCQs

A 4-year-old girl presents with swelling of the legs and ankles. Physical examination reveals pitting edema of the lower extremities. Urinalysis shows 2+ proteinuria. The urinary sediment contains no inflammatory cells or red blood cells. Serum levels of BUN and creatinine are normal. The patient recovers completely after a course of corticosteroids. Electron microscopy of a renal biopsy specimen prior to treatment would most likely demonstrate which of the following abnormalities?

Q115Easy

Which gene mutation is associated with X-linked Alport Syndrome?

Q116Easy

What is true about post-streptococcal glomerulonephritis?

Q117Medium

Which renal tumor has a multicentric origin?

Q118Easy

What is a potential cause for renal vein thrombosis?

Q119Medium

Renal vein thrombosis is associated with which underlying disease of the kidney?

Q120Medium

Which of the following conditions is not related to immunity?

Renal Pathology Indian Medical PG Practice Questions and MCQs

Question 111: All of the following are true regarding minimal change glomerulonephritis except?

A. Poor response to steroids (Correct Answer)
B. Normal glomerulus on light microscopy
C. More common in children than adults
D. Absence of podocytes on electron microscopy

Explanation: **Explanation:** Minimal Change Disease (MCD), also known as Nil Disease, is the most common cause of nephrotic syndrome in children [1]. The hallmark of this condition is the **excellent response to corticosteroid therapy** [1], [2], which is why Option A is the correct "except" answer. Over 90% of children respond rapidly to steroids [2], though relapses can occur. **Analysis of Options:** * **Option A (Correct):** MCD is highly steroid-sensitive [1]. A poor response to steroids in a child initially diagnosed with MCD should raise suspicion for Focal Segmental Glomerulosclerosis (FSGS) [1]. * **Option B:** On **Light Microscopy**, the glomeruli appear completely normal (hence the name "Minimal Change"). There is no hypercellularity or basement membrane thickening [2]. * **Option C:** MCD accounts for approximately 70-90% of nephrotic syndrome cases in children, compared to only 10-15% in adults [3]. * **Option D:** On **Electron Microscopy**, the characteristic finding is the **effacement (fusion/loss) of podocyte foot processes** [1], [2]. While the podocyte cells themselves are present, the specialized foot process architecture is "absent" or flattened, leading to the breakdown of the filtration barrier. **NEET-PG High-Yield Pearls:** * **Immunofluorescence:** Typically negative (no immune complex deposits) [1]. * **Pathogenesis:** T-cell derived cytokine (possibly IL-13) causes loss of the glomerular polyanion (heparan sulfate), leading to **selective proteinuria** (mainly albumin) [2]. * **Associations:** Hodgkin Lymphoma and NSAID use. * **Stain:** Jones Silver stain and PAS show normal basement membranes [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 922-923. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 919-921.

Question 112: In acute interstitial nephritis, which proteins are characteristically associated with the interstitial infiltrate?

A. Amyloid (Correct Answer)
B. Fibrinogen
C. Vitamin D binding protein
D. Albumin

Explanation: **Explanation:** In **Acute Interstitial Nephritis (AIN)**, the hallmark pathological finding is an intense inflammatory infiltrate within the renal interstitium. While the cellular infiltrate typically consists of T-lymphocytes, macrophages, and eosinophils, specific proteins are often found associated with this process. **Why Amyloid is the correct answer:** In the context of renal pathology questions for NEET-PG, **Amyloid P component** is a glycoprotein that is characteristically associated with the interstitial infiltrate and basement membranes in various renal inflammatory and infiltrative conditions. It is important to note that while "Amyloid" usually refers to the disease state (Amyloidosis), the **Amyloid P component (SAP)** is a normal plasma protein that binds to various ligands in an inflammatory milieu. In AIN, it acts as a marker within the interstitial space, often used in immunofluorescence or immunohistochemistry to study the extent of interstitial damage. **Analysis of Incorrect Options:** * **B. Fibrinogen:** While fibrinogen may be seen in cases of crescentic glomerulonephritis or severe vascular injury (fibrinoid necrosis), it is not a characteristic marker for the interstitial infiltrate in AIN. * **C. Vitamin D binding protein:** This protein is filtered by the glomerulus and reabsorbed by the proximal tubules. It is a marker of tubular dysfunction (low molecular weight proteinuria) rather than a component of the interstitial infiltrate. * **D. Albumin:** Albumin is the primary protein lost in glomerular diseases (nephrotic syndrome). While it may leak into the interstitium during severe injury, it is non-specific and not a diagnostic characteristic of the AIN infiltrate. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of AIN:** Fever, Rash, and Eosinophilia (often drug-induced, e.g., NSAIDs, Penicillins, Sulfonamides). * **Urinary Finding:** Sterile pyuria and **Eosinophiluria** (Hansel’s stain). * **Pathology:** Edema and "Tubulitis" (lymphocytes infiltrating the tubular epithelium) are key histological features.

Question 113: Kimmelstiel Wilson disease is characterized by which of the following findings?

A. Diffuse glomerulosclerosis
B. Capillary basement membrane thickening
C. Nodular glomerulosclerosis (Correct Answer)
D. Increase in meningeal matrix

Explanation: **Explanation:** **Kimmelstiel-Wilson (KW) disease** is the pathognomonic lesion of **Diabetic Nephropathy**. It is characterized by **Nodular Glomerulosclerosis**, which involves the formation of ovoid or spherical, laminated, hyaline masses situated in the periphery of the glomerulus [1]. These nodules are PAS-positive and represent an accumulation of mesangial matrix [1]. **Analysis of Options:** * **Option C (Correct):** Nodular glomerulosclerosis is the hallmark of KW disease [1]. While it occurs in only 15-30% of diabetic patients, it is highly specific for diabetes mellitus. * **Option A:** Diffuse glomerulosclerosis is actually the *most common* lesion in diabetic nephropathy, characterized by a generalized increase in mesangial matrix [1]. However, the specific term "Kimmelstiel-Wilson disease" refers strictly to the nodular form. * **Option B:** Capillary basement membrane thickening is the *earliest* morphological change seen in diabetic nephropathy (detected via electron microscopy) [2], but it does not define KW disease. * **Option D:** This is a distractor. The matrix increase occurs in the **mesangium** of the kidney, not the "meninges" (which relate to the brain). **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic finding:** KW nodules (Nodular Glomerulosclerosis) [1]. * **Stain:** PAS (Periodic Acid-Schiff) positive [1]. * **Earliest Clinical Sign:** Microalbuminuria (30-300 mg/day). * **Associated finding:** Fibrin caps and Capsular drops are also seen in diabetic kidneys. * **Armanni-Ebstein Lesions:** Vacuolation of proximal tubular epithelial cells due to glycogen deposits (seen in uncontrolled diabetes). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1121-1122. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1121.

Question 114: A 4-year-old girl presents with swelling of the legs and ankles. Physical examination reveals pitting edema of the lower extremities. Urinalysis shows 2+ proteinuria. The urinary sediment contains no inflammatory cells or red blood cells. Serum levels of BUN and creatinine are normal. The patient recovers completely after a course of corticosteroids. Electron microscopy of a renal biopsy specimen prior to treatment would most likely demonstrate which of the following abnormalities?

A. Duplication of capillary basement membranes
B. Electron-dense immune deposits in the capillary basement membranes
C. Electron-dense immune deposits in the mesangium
D. Fusion of podocyte foot processes (Correct Answer)

Explanation: ### Explanation The clinical presentation describes a classic case of **Minimal Change Disease (MCD)**, the most common cause of nephrotic syndrome in children (peak age 2–6 years) [1]. **1. Why the Correct Answer is Right:** MCD is characterized by "minimal" changes under Light Microscopy (normal-appearing glomeruli) and negative Immunofluorescence. The hallmark diagnostic feature is seen only on **Electron Microscopy (EM)**: the **effacement (fusion) of podocyte foot processes** [1]. This occurs due to the loss of the glomerular polyanionic charge (sialic acid), leading to selective proteinuria (mainly albumin) [2]. A key clinical diagnostic clue is the **excellent response to corticosteroid therapy**, as seen in this patient [2]. **2. Why Incorrect Options are Wrong:** * **Option A (Duplication of GBM):** This "tram-track" appearance is characteristic of **Membranoproliferative Glomerulonephritis (MPGN)** [1], which usually presents with a mixed nephritic-nephrotic picture and low complement levels. * **Option B (Subepithelial/Intramembranous deposits):** This describes **Membranous Nephropathy** (the most common cause of nephrotic syndrome in adults) [3]. It presents with "spikes and domes" on silver stain, not seen in MCD. * **Option C (Mesangial deposits):** This is characteristic of **IgA Nephropathy (Berger’s disease)** [3] or Henoch-Schönlein Purpura, which typically presents with gross hematuria following an upper respiratory infection. **3. NEET-PG High-Yield Pearls:** * **MCD** is associated with **Hodgkin Lymphoma** in adults (due to T-cell dysfunction/cytokine release). * **Proteinuria in MCD is "Selective"** (predominantly Albumin) [2]. * **Light Microscopy:** Shows lipid accumulation in proximal tubule cells (**Lipoid Nephrosis**). * **First-line treatment:** Prednisone. If steroid-resistant, consider a diagnosis of Focal Segmental Glomerulosclerosis (FSGS) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 922-923. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 919-921.

Question 115: Which gene mutation is associated with X-linked Alport Syndrome?

A. COL4A1
B. COL4A3
C. COL4A4
D. COL4A5 (Correct Answer)

Explanation: **Explanation:** Alport Syndrome is a hereditary nephritis caused by mutations in the genes encoding the **Type IV collagen** chains, which are essential components of the glomerular basement membrane (GBM), cochlea, and lens. **1. Why COL4A5 is correct:** Approximately **80% of Alport Syndrome cases are X-linked dominant**, resulting from a mutation in the **COL4A5** gene located on the X chromosome. This gene encodes the **α5 chain** of Type IV collagen. The lack of functional α5 chains prevents the normal assembly of the α3-α4-α5 collagen network, leading to a defective, thinning, and eventually splitting GBM [1]. **2. Why the other options are incorrect:** * **COL4A3 and COL4A4 (Options B & C):** Mutations in these genes (encoding α3 and α4 chains) are associated with **Autosomal Recessive** or **Autosomal Dominant** forms of Alport Syndrome. While they produce a similar clinical phenotype, they do not follow the X-linked inheritance pattern. * **COL4A1 (Option A):** Mutations in this gene are associated with hereditary angiopathy, nephropathy, aneurysms, and muscle cramps (HANAC) syndrome, but not classic Alport Syndrome. **3. High-Yield Clinical Pearls for NEET-PG:** * **Clinical Triad:** Hereditary nephritis (hematuria/ESRD), Sensorineural deafness, and Ocular defects (e.g., **Anterior Lenticonus**). * **Electron Microscopy (Gold Standard):** Characterized by a "Basket-weave appearance" due to irregular thinning and thickening with splitting of the lamina densa. * **Immunofluorescence:** Shows a characteristic loss of staining for α3, α4, and α5 collagen chains in the GBM [1]. * **Differential Diagnosis:** Thin Basement Membrane Lesion (Benign Familial Hematuria) also involves COL4A3/COL4A4 but presents with isolated hematuria without systemic involvement [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 929-930.

Question 116: What is true about post-streptococcal glomerulonephritis?

A. Linear deposition
B. Diffuse involvement (Correct Answer)
C. Tram track appearance
D. Global sclerosis

Explanation: **Explanation:** **Post-Streptococcal Glomerulonephritis (PSGN)** is a classic example of an immune-complex-mediated Type III hypersensitivity reaction [1]. It typically occurs 1–4 weeks after a streptococcal skin (impetigo) or throat (pharyngitis) infection [3]. **Why "Diffuse involvement" is correct:** The term "diffuse" in renal pathology indicates that **>50% of all glomeruli** are affected. PSGN is characterized by a **Diffuse Proliferative Glomerulonephritis (DPGN)** pattern [1]. Under light microscopy, all glomeruli appear enlarged and hypercellular due to the proliferation of endothelial and mesangial cells, along with an intense infiltrate of neutrophils and monocytes [2]. **Analysis of Incorrect Options:** * **A. Linear deposition:** This is characteristic of **Anti-GBM disease (Goodpasture Syndrome)**, where antibodies target the glomerular basement membrane directly [1]. PSGN shows a **granular ("starry sky")** pattern on immunofluorescence due to immune complex deposition [1]. * **C. Tram track appearance:** This refers to the splitting of the basement membrane, which is the hallmark of **Membranoproliferative Glomerulonephritis (MPGN)**, not PSGN. * **D. Global sclerosis:** This refers to the scarring of the entire glomerular tuft, typically seen in end-stage renal disease or advanced **FSGS**, rather than an acute inflammatory condition like PSGN. **High-Yield Clinical Pearls for NEET-PG:** * **Electron Microscopy (Gold Standard):** Characterized by **"Subepithelial humps"** (humps of IgG, IgM, and C3) [1]. * **Serology:** Low C3 levels (normalized by 6–8 weeks) and elevated ASO titers (after pharyngitis) or Anti-DNase B (after skin infection). * **Clinical Presentation:** Nephritic syndrome (hematuria, "coke-colored" urine, hypertension, and periorbital edema) [1]. * **Prognosis:** Excellent in children (>95% recover); more likely to progress to chronic renal failure in adults [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 915. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 915-916. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 914-915. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 916-917.

Question 117: Which renal tumor has a multicentric origin?

A. Squamous cell carcinoma (Correct Answer)
B. Renal cell carcinoma
C. Both
D. None

Explanation: **Explanation:** **1. Why Squamous Cell Carcinoma (SCC) is Correct:** Squamous cell carcinoma of the renal pelvis is a rare but aggressive tumor. It typically arises due to chronic irritation, most commonly from **long-standing staghorn calculi (urolithiasis)** or chronic infections. This chronic irritation leads to **squamous metaplasia** of the urothelium. Because the underlying stimulus (stones or infection) often affects multiple areas of the renal collecting system simultaneously, the resulting malignant transformation can occur at several sites, giving it a **multicentric origin**. **2. Why Other Options are Incorrect:** * **Renal Cell Carcinoma (RCC):** While RCC can occasionally be bilateral or multifactorial (especially in hereditary syndromes like Von Hippel-Lindau), it is classically described as a **unicentric** tumor arising from the renal tubular epithelium [1]. It typically presents as a solitary cortical mass [1]. However, it is important to note that specific subtypes like papillary carcinomas are frequently multifocal in origin [1]. * **Both/None:** These are incorrect because the characteristic multicentricity associated with field-effect changes (metaplasia) is a hallmark of SCC of the renal pelvis rather than the standard presentation of RCC. **3. High-Yield Clinical Pearls for NEET-PG:** * **Risk Factor:** The strongest association for Renal SCC is **chronic nephrolithiasis** (present in ~75% of cases). * **Histology:** Look for keratin pearls and intercellular bridges. * **Prognosis:** SCC of the renal pelvis has a much poorer prognosis compared to Transitional Cell Carcinoma (TCC) or RCC because it is usually diagnosed at an advanced stage. * **Differential:** Do not confuse this with **Transitional Cell Carcinoma (TCC)**, which is also multicentric due to "field cancerization" but is histologically distinct from SCC. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 958-961.

Question 118: What is a potential cause for renal vein thrombosis?

A. Membranous nephropathy (Correct Answer)
B. Lupus nephritis
C. Membranoproliferative glomerulonephritis
D. Post-streptococcal glomerulonephritis

Explanation: **Renal Vein Thrombosis (RVT)** is a well-known complication of **Nephrotic Syndrome** [1]. The primary mechanism is a hypercoagulable state caused by the urinary loss of anticoagulant proteins (like Antithrombin III, Protein C, and S) and a compensatory increase in hepatic synthesis of pro-coagulant factors (Fibrinogen). 1. **Why Membranous Nephropathy (MN) is correct:** While any nephrotic syndrome can lead to RVT, **Membranous Nephropathy** has the highest clinical association (up to 25-30% of cases). The profound proteinuria and specific changes in the glomerular basement membrane in MN create a particularly high risk for thromboembolic events compared to other glomerular diseases [2, 3]. 2. **Why other options are incorrect:** * **Lupus Nephritis (B) & MPGN (C):** These can present with nephrotic-range proteinuria and may occasionally cause RVT, but the statistical association is significantly lower than that of MN [3]. * **PSGN (D):** This is a classic **Nephritic Syndrome** characterized by hematuria and hypertension rather than heavy proteinuria [2]. Therefore, the risk of hypercoagulability and RVT is minimal. **High-Yield NEET-PG Pearls:** * **Triad of RVT:** Flank pain, hematuria, and a sudden increase in proteinuria/serum creatinine. * **Left vs. Right:** The left renal vein is more commonly involved due to its longer course and anatomical complexity. * **Other causes of RVT:** Renal Cell Carcinoma (invasion of the renal vein), dehydration (in infants), and oral contraceptive use. * **Gold Standard Diagnosis:** Selective Renal Venography (though CT Angiography is more commonly used in practice). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 919-921. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 527-528. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 926-927.

Question 119: Renal vein thrombosis is associated with which underlying disease of the kidney?

A. Chronic glomerulonephritis
B. Pyelonephritis
C. Systemic Lupus Erythematosus (SLE)
D. Nephrotic syndrome (Correct Answer)

Explanation: **Explanation:** **Why Nephrotic Syndrome is the Correct Answer:** Nephrotic syndrome is characterized by a **hypercoagulable state**, which significantly increases the risk of venous and arterial thrombosis [1]. The primary mechanism involves the massive urinary loss of low-molecular-weight anticoagulants, specifically **Antithrombin III (ATIII)**, Protein C, and Protein S. Simultaneously, the liver increases the synthesis of pro-coagulant factors (Fibrinogen, Factor V, and VIII) and lipids in response to low oncotic pressure. Among all causes of nephrotic syndrome, **Membranous Nephropathy** is most strongly associated with Renal Vein Thrombosis (RVT) [2]. **Analysis of Incorrect Options:** * **A. Chronic Glomerulonephritis:** While this leads to end-stage renal disease and uremia, it does not typically present with the specific hypercoagulable profile (ATIII loss) required to trigger acute renal vein thrombosis. * **B. Pyelonephritis:** This is an inflammatory/infectious condition of the renal pelvis and parenchyma. While severe cases (like emphysematous pyelonephritis) can cause local vascular damage, it is not a systemic predisposing factor for RVT. * **C. Systemic Lupus Erythematosus (SLE):** SLE can cause Nephritic or Nephrotic syndrome (Lupus Nephritis) [2]. While SLE patients with *Antiphospholipid Syndrome* are at risk for thrombosis, "Nephrotic Syndrome" is the more direct and classic association taught in renal pathology for RVT. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of RVT:** Sudden onset flank pain, hematuria, and an increase in kidney size (due to venous congestion). * **Most Common Cause:** Membranous Nephropathy (up to 30% of patients develop RVT) [2]. * **Left vs. Right:** The left renal vein is more commonly involved due to its longer course and complex anatomy. * **Varicocele:** In males, a left-sided RVT can present with a sudden "bag of worms" varicocele because the left gonadal vein drains into the left renal vein. **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. 527-528. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 919-921.

Question 120: Which of the following conditions is not related to immunity?

A. Membranoproliferative glomerulonephritis (MPGN)
B. Post-streptococcal glomerulonephritis (PSGN)
C. Diabetic nephropathy (Correct Answer)
D. IgA nephropathy

Explanation: **Explanation:** The core of this question lies in distinguishing between **immunologically mediated** glomerular diseases and **metabolic/hemodynamic** glomerular diseases. **Why Diabetic Nephropathy is the Correct Answer:** Diabetic nephropathy is primarily a **metabolic and hemodynamic disorder**, not an immune-mediated one. Its pathogenesis involves: 1. **Non-enzymatic glycosylation** of the glomerular basement membrane (GBM) proteins, leading to increased permeability and hyaline arteriolosclerosis [1]. 2. **Hyperfiltration injury** caused by hemodynamic changes (increased intraglomerular pressure). While inflammation occurs in later stages, the primary insult is glucose-driven metabolic stress, not the deposition of immune complexes or antibodies. **Why the Other Options are Incorrect:** * **PSGN (Post-streptococcal Glomerulonephritis):** A classic **Type III hypersensitivity** reaction. It is caused by the deposition of immune complexes (antigen-antibody) in the subepithelial space following a Group A Beta-hemolytic Streptococcal infection [2]. * **MPGN (Membranoproliferative Glomerulonephritis):** This involves immune complex deposition (Type I) or dysregulation of the **alternative complement pathway** (Type II/C3 Glomerulopathy), both of which are components of the immune system [2]. * **IgA Nephropathy (Berger’s Disease):** Characterized by the deposition of **abnormally glycosylated IgA1** immune complexes in the mesangium [2]. It is the most common primary glomerulonephritis worldwide. **NEET-PG High-Yield Pearls:** * **Kimmelstiel-Wilson (KW) lesions:** Pathognomonic nodular glomerulosclerosis seen in Diabetic Nephropathy. * **Earliest Clinical Sign:** Microalbuminuria (30-300 mg/day). * **Lumpy-Bumpy Pattern:** Seen on Immunofluorescence in PSGN due to IgG and C3 deposits [2]. * **Mesangial "Tree-like" Deposits:** Characteristic of IgA nephropathy on electron microscopy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 907-908. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 911-915.

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