Renal Pathology Practice Questions

Q: Type I Membranoproliferative Glomerulonephritis is commonly associated with which of the following conditions, EXCEPT?

Captopril. **Explanation:** **Membranoproliferative Glomerulonephritis (MPGN) Type I** is characterized by the subendothelial deposition of immune complexes [1][2], leading to a "tram-track" appearance on light microscopy due to basement membrane splitting [3]. **Why Captopril is the correct answer:** Captopril (an ACE inhibitor) is classically associated with **Membranous Nephropathy**, not MPGN. Other drugs linked to Membranous Nephropathy include NSAIDs, Penicillamine, and Gold salts. Captopril does not have a documented association with the immune-complex mediated proliferative changes seen in MPGN. **Analysis of Incorrect Options:** * **Hepatitis C (Option B):** This is the most common association for secondary MPGN Type I, often presenting with mixed cryoglobulinemia [1]. * **Systemic Lupus Erythematosus (Option A):** SLE can present with various renal patterns; Class IV Lupus Nephritis often demonstrates a "membranoproliferative" pattern of injury [2]. * **Neoplastic conditions (Option D):** Chronic lymphocytic leukemia (CLL) and other B-cell lymphomas are known triggers for MPGN Type I due to chronic antigenemia [1]. **NEET-PG High-Yield Pearls:** * **Morphology:** Look for "Tram-track" or "Double contour" appearance caused by mesangial cell interposition [3]. * **Immunofluorescence:** MPGN Type I shows a "granular" pattern (C3 and IgG), whereas MPGN Type II (Dense Deposit Disease) shows C3 only [3]. * **Complement:** Both types are associated with **hypocomplementemia** (low C3) [1]. * **MPGN Type II:** Associated with **C3 Nephritic Factor**, an autoantibody that stabilizes C3 convertase. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 926-927. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 911. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 925-926.

Q: What is the most common site of origin for renal cell carcinoma?

Proximal convoluted tubule. **Explanation:** **Renal Cell Carcinoma (RCC)** is the most common primary malignancy of the kidney, accounting for approximately 85-90% of all renal tumors. 1. **Why Option A is correct:** The most common histological subtype of RCC is **Clear Cell Carcinoma** (70-80% of cases). Cytogenetic studies and immunohistochemistry have confirmed that Clear Cell RCC and Papillary RCC both originate from the **epithelium of the Proximal Convoluted Tubule (PCT)** [1]. These cells are characterized by an abundance of glycogen and lipids, which dissolve during routine processing, giving them their characteristic "clear" appearance. 2. **Why the other options are incorrect:** * **Option B (Distal Convoluted Tubule):** While some rare variants like Chromophobe RCC are thought to arise from the intercalated cells of the distal nephron, the DCT is not the primary site for the most prevalent clear cell subtype [1]. * **Option C (Collecting Ducts):** Collecting Duct Carcinoma (Bellini duct tumor) is a highly aggressive but extremely rare subtype (less than 1% of RCCs). * **Option D (Loop of Henle):** This segment is generally not associated with the primary origin of major RCC subtypes. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Hematuria (most common), flank pain, and a palpable abdominal mass (seen in <10% of patients). * **Risk Factors:** Smoking (most significant), obesity, hypertension, and acquired cystic kidney disease (in dialysis patients). * **Genetics:** Most cases are sporadic, but hereditary forms are associated with **Von Hippel-Ludau (VHL) syndrome** (Chromosome 3p deletion) [1]. * **Paraneoplastic Syndromes:** RCC is known as the "internist's tumor" because it can secrete hormones leading to Polycythemia (EPO), Hypercalcemia (PTHrP), and Cushing’s syndrome (ACTH). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 958-959.

Q: An emerging viral pathogen causing pyelonephritis in kidney allografts is:

Polyomavirus. **Explanation:** **Polyomavirus (specifically BK virus)** is the correct answer because it is a major cause of opportunistic infection in kidney transplant recipients. In the setting of potent immunosuppression, the latent BK virus (a member of the Polyomavirus family) reactivates, leading to **BK virus-associated nephropathy (BKVAN)**. This condition is characterized by viral replication within the tubular epithelial cells, causing inflammation and necrosis that clinically mimics acute cellular rejection. Histologically, it presents with characteristic **intranuclear viral inclusions** (ground-glass appearance) in tubular cells [1]. **Analysis of Incorrect Options:** * **Rotavirus:** Primarily causes viral gastroenteritis in children; it does not have a tropism for renal tissue or cause pyelonephritis. * **Herpes Simplex Virus (HSV):** While HSV can cause systemic infections in immunocompromised hosts, it typically manifests as mucocutaneous lesions, esophagitis, or hepatitis, rather than graft pyelonephritis. * **Influenza Virus:** This is a respiratory pathogen causing pneumonia or systemic flu-like symptoms; it does not target the renal allograft. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** Look for **"Decoy cells"** (cells with enlarged nuclei and inclusions) in urine cytology. Definitive diagnosis is made via renal biopsy. * **SV40 Staining:** Immunohistochemistry for the SV40 large T antigen is the gold standard for identifying Polyomavirus in tissue sections. * **Management:** The primary treatment strategy is the **reduction of immunosuppressive therapy** to allow the host immune system to control the viral replication. * **JC Virus:** Another Polyomavirus, but it primarily causes Progressive Multifocal Leukoencephalopathy (PML) rather than nephropathy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 934-935.

Question 1

A child presented with edema, massive proteinuria, and hyperlipidemia. Which statement about this condition is true?

Accepted Answer

Glomerular function is lost due to the loss of the polyanionic charge on both sites of the glomerular foot process.

Answer

Type of focal segmental glomerulosclerosis.

Answer

IgA deposition on the basement membrane.

Answer

Foot processes of the glomerular membrane are normal.

Question 2

Type I Membranoproliferative Glomerulonephritis is commonly associated with which of the following conditions, EXCEPT?

Accepted Answer

Captopril

Answer

Systemic Lupus Erythematosus (SLE)

Answer

Hepatitis C infections

Answer

Neoplastic conditions

Question 3

In Systemic Lupus Erythematosus (SLE), what is the characteristic kidney lesion?

Accepted Answer

Wire loop lesions

Answer

Mesangial proliferation

Answer

Tubular fibrin deposits

Answer

IgG deposits

Question 4

Anti-PLA2R antibody is commonly found in which of the following renal diseases?

Accepted Answer

Membranous nephropathy

Answer

Anti-GBM disease

Answer

Focal segmental glomerulosclerosis

Answer

Dense deposit disease

Question 5

What is the most common site of origin for renal cell carcinoma?

Accepted Answer

Proximal convoluted tubule

Answer

Distal convoluted tubule

Answer

Collecting ducts

Answer

Loop of Henle

Question 6

Which of the following statements is NOT true for renal cell carcinoma?

Accepted Answer

Progesterone increases tumor size.

Answer

It spreads hematogenously.

Answer

Clear cell carcinoma is the most common histological type.

Answer

It is more common in males.

Question 7

An emerging viral pathogen causing pyelonephritis in kidney allografts is:

Accepted Answer

Polyomavirus

Answer

Rotavirus

Answer

Herpes simplex

Answer

Influenza virus

Question 8

Which of the following statements about IgA nephropathy is false?

Accepted Answer

Complement levels are typically decreased

Answer

Characterized by mesangial proliferation

Answer

Also known as Berger's nephropathy

Answer

Associated with recurrent hematuria

Question 9

Glomerulonephritis associated with sensory neuronal deafness is seen in which condition?

Accepted Answer

Alport syndrome

Answer

Nail patella syndrome

Answer

Down syndrome

Answer

Fabry's disease

Question 10

Sickle cell disease is associated with which type of renal cell carcinoma?

Accepted Answer

Medullary

Answer

Papillary

Answer

Chromophobe

Answer

Collecting duct

Renal Pathology — MCQs

Renal Pathology — MCQs

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