Renal Pathology — MCQs

Renal Pathology Indian Medical PG Practice Questions and MCQs

Question 261: A child presented with edema, massive proteinuria, and hyperlipidemia. Which statement about this condition is true?

A. Type of focal segmental glomerulosclerosis.
B. IgA deposition on the basement membrane.
C. Foot processes of the glomerular membrane are normal.
D. Glomerular function is lost due to the loss of the polyanionic charge on both sites of the glomerular foot process. (Correct Answer)

Explanation: ### Explanation The clinical presentation of **edema, massive proteinuria, and hyperlipidemia** in a child is the classic triad of **Minimal Change Disease (MCD)**, the most common cause of Nephrotic Syndrome in children [1]. #### Why the Correct Answer is Right In MCD, the primary defect is not structural damage visible under light microscopy, but a **biochemical alteration**. The glomerular filtration barrier loses its **polyanionic charge** (specifically the negatively charged sialoglycoproteins like podocalyxin). Since albumin is also negatively charged, the loss of this "charge barrier" leads to massive selective proteinuria (albuminuria). This charge loss occurs on the surface of the podocytes (visceral epithelial cells), leading to the characteristic effacement of foot processes seen on electron microscopy [1]. #### Why Other Options are Wrong * **Option A:** MCD is a distinct entity from Focal Segmental Glomerulosclerosis (FSGS). While FSGS also presents with nephrotic syndrome, it involves structural scarring (sclerosis) and typically has a poorer prognosis and response to steroids compared to MCD [2]. * **Option B:** IgA deposition is the hallmark of **IgA Nephropathy (Berger’s Disease)**, which typically presents with nephritic features (hematuria) rather than pure nephrotic syndrome. Immunofluorescence in MCD is characteristically **negative** [1]. * **Option C:** Under **Electron Microscopy**, the foot processes are **not normal**; they show diffuse effacement (flattening/fusion) [1]. They appear "normal" only under Light Microscopy. #### NEET-PG High-Yield Pearls * **Light Microscopy:** Glomeruli appear completely normal (hence "Minimal Change"). * **Electron Microscopy (Gold Standard):** Diffuse effacement of podocyte foot processes [1]. * **Treatment:** Highly steroid-responsive (Prednisolone is the drug of choice) [1]. * **Association:** Can be associated with Hodgkin Lymphoma in adults (due to T-cell dysfunction/cytokine release). * **Proteinuria Type:** Highly **selective** (mainly albumin) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 922-923. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 530-531.

Question 262: Type I Membranoproliferative Glomerulonephritis is commonly associated with which of the following conditions, EXCEPT?

A. Systemic Lupus Erythematosus (SLE)
B. Hepatitis C infections
C. Captopril (Correct Answer)
D. Neoplastic conditions

Explanation: **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.

Question 263: In Systemic Lupus Erythematosus (SLE), what is the characteristic kidney lesion?

A. Mesangial proliferation
B. Tubular fibrin deposits
C. Wire loop lesions (Correct Answer)
D. IgG deposits

Explanation: **Explanation:** **Why "Wire loop lesions" is correct:** In Systemic Lupus Erythematosus (SLE), specifically in **Class IV Lupus Nephritis (Diffuse Proliferative Glomerulonephritis)**, there is massive subendothelial deposition of immune complexes [1]. On light microscopy, these thick, eosinophilic deposits cause the capillary walls to appear markedly thickened and rigid, resembling a "wire loop" [2]. This is a hallmark histological finding of active, severe SLE involvement in the kidney [2]. **Analysis of Incorrect Options:** * **A. Mesangial proliferation:** While seen in Class II (Mesangial Proliferative) and Class III/IV SLE, it is non-specific and occurs in many other glomerulonephritides (e.g., IgA Nephropathy) [1]. It is not the "characteristic" diagnostic lesion for SLE. * **B. Tubular fibrin deposits:** Fibrinoid necrosis can occur in the glomeruli in severe SLE, but "tubular fibrin deposits" is not a recognized or characteristic feature of lupus nephritis. * **D. IgG deposits:** While SLE shows a "Full House" pattern on immunofluorescence (IgG, IgA, IgM, C3, and C1q), IgG deposits alone are seen in almost all immune-complex-mediated renal diseases (like PSGN or Membranous Nephropathy) [3] and are therefore not specific to SLE. **High-Yield Clinical Pearls for NEET-PG:** * **WHO/ISN/RPS Classification:** Class IV (Diffuse Proliferative) is the most common and most severe form [2]. * **Immunofluorescence:** Look for the **"Full House" pattern** (positive for all immunoglobulins and complement components). * **Electron Microscopy:** The characteristic finding is **subendothelial deposits** (corresponding to wire loops) [1] and **tubuloreticular inclusions** (induced by Interferon-alpha). * **Hematoxylin Bodies:** These are extracellular aggregates of damaged nuclei (LE bodies) found in the glomerulus, which are highly specific for SLE. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 911. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 230-232. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 532-533.

Question 264: Anti-PLA2R antibody is commonly found in which of the following renal diseases?

A. Anti-GBM disease
B. Focal segmental glomerulosclerosis
C. Membranous nephropathy (Correct Answer)
D. Dense deposit disease

Explanation: **Explanation:** **Membranous Nephropathy (MN)** is the correct answer [1]. In approximately 70-80% of patients with **Primary (Idiopathic) Membranous Nephropathy**, the disease is caused by autoantibodies (IgG4) directed against the **Phospholipase A2 Receptor (PLA2R)**, a transmembrane protein located on the surface of podocytes. The binding of these antibodies leads to *in situ* immune complex formation, activation of the complement system (C5b-9), and subsequent podocyte injury [2], resulting in the characteristic "spike and dome" appearance on basement membrane staining [1]. **Why other options are incorrect:** * **Anti-GBM disease:** This is characterized by antibodies against the **̑3 chain of Type IV Collagen** in the glomerular basement membrane, typically presenting as Goodpasture Syndrome [2]. * **Focal Segmental Glomerulosclerosis (FSGS):** This is primarily a disease of podocyte effacement often linked to circulating "permeability factors" (like suPAR) or genetic mutations (Podocin/Nephrin), but not anti-PLA2R [3]. * **Dense Deposit Disease (MPGN Type II):** This is associated with **C3 Nephritic Factor (C3NeF)**, an autoantibody that stabilizes C3 convertase, leading to alternative complement pathway dysregulation [3]. **High-Yield Clinical Pearls for NEET-PG:** * **PLA2R** is highly specific for **Primary MN**; its absence suggests Secondary MN (associated with SLE, Hepatitis B, or Malignancy). * **Thrombospondin Type-1 Domain-Containing 7A (THSD7A)** is the second most common antibody in MN (approx. 1-5%). * **Morphology:** Light microscopy shows diffuse capillary wall thickening; Electron microscopy shows **subepithelial deposits** [1]. * **Rule of Thumb:** MN is the most common cause of Nephrotic Syndrome in Caucasian adults. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 921. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 909. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928.

Question 265: What is the most common site of origin for renal cell carcinoma?

A. Proximal convoluted tubule (Correct Answer)
B. Distal convoluted tubule
C. Collecting ducts
D. Loop of Henle

Explanation: **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.

Question 266: Which of the following statements is NOT true for renal cell carcinoma?

A. Progesterone increases tumor size. (Correct Answer)
B. It spreads hematogenously.
C. Clear cell carcinoma is the most common histological type.
D. It is more common in males.

Explanation: **Explanation:** **Renal Cell Carcinoma (RCC)** is the most common primary malignancy of the kidney. Understanding its epidemiology and behavior is crucial for NEET-PG. **Why Option A is the Correct Answer (The False Statement):** Contrary to the statement, **Progesterone actually inhibits the growth of Renal Cell Carcinoma.** Historically, high-dose progestogens (like Medroxyprogesterone acetate) were used as a form of hormonal therapy for metastatic RCC because they were found to induce regression or stabilization of the tumor in some patients. Therefore, progesterone does not increase tumor size; it has an inhibitory effect. **Analysis of Other Options:** * **Option B (Hematogenous Spread):** This is a characteristic feature of RCC. Unlike most carcinomas that spread primarily via lymphatics, RCC has a notorious propensity for **venous invasion**, often extending into the renal vein and the Inferior Vena Cava (IVC), leading to early hematogenous spread (most commonly to the lungs) [1], [2]. * **Option C (Most Common Type):** **Clear Cell Carcinoma** is indeed the most common histological subtype, accounting for approximately 70-80% of all RCC cases [1], [3]. It is typically associated with deletions of the **VHL gene** on chromosome 3p [3]. * **Option D (Male Predominance):** RCC shows a clear gender predilection, being **twice as common in males** as in females (2:1 ratio), usually occurring in the 6th to 7th decades of life. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Smoking (most significant), obesity, hypertension, and acquired cystic kidney disease (in dialysis patients). * **Classic Triad:** Hematuria, flank pain, and palpable mass (seen in only 10% of cases). * **Paraneoplastic Syndromes:** RCC is the "Great Mimicker," often producing EPO (Polycythemia), PTHrP (Hypercalcemia), or Renin (Hypertension) [2]. * **Stauffer Syndrome:** Reversible hepatic dysfunction in the absence of liver metastases. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 959-961. [2] 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. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 958-959.

Question 267: An emerging viral pathogen causing pyelonephritis in kidney allografts is:

A. Rotavirus
B. Herpes simplex
C. Polyomavirus (Correct Answer)
D. Influenza virus

Explanation: **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 268: Which of the following statements about IgA nephropathy is false?

A. Characterized by mesangial proliferation
B. Also known as Berger's nephropathy
C. Associated with recurrent hematuria
D. Complement levels are typically decreased (Correct Answer)

Explanation: **Explanation:** **IgA Nephropathy (Berger’s Disease)** is the most common cause of primary glomerulonephritis worldwide [1]. The hallmark of this condition is the deposition of IgA-dominant immune complexes in the glomerular mesangium [2]. **Why Option D is the Correct Answer (The False Statement):** Unlike other immune-complex mediated glomerulonephritides (such as Post-Streptococcal GN or Lupus Nephritis), **IgA nephropathy is characterized by normal serum complement levels (C3 and C4).** While the alternative complement pathway is activated within the renal tissue itself, this localized consumption does not typically result in a decrease in systemic (serum) complement levels. **Analysis of Incorrect Options:** * **Option A:** True. Light microscopy typically shows **mesangial hypercellularity** and increased mesangial matrix due to the deposition of IgA1 [1], [2]. * **Option B:** True. It is eponymously known as **Berger’s disease**, first described by Jean Berger in 1968. * **Option C:** True. The classic clinical presentation is **recurrent gross or microscopic hematuria**, often occurring within 1-2 days of an upper respiratory or gastrointestinal infection (synpharyngitic hematuria) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Immunofluorescence (Gold Standard):** Shows granular mesangial deposits of **IgA** and **C3**. * **Electron Microscopy:** Shows **dense deposits** limited to the mesangium. * **Association:** Frequently associated with **Henoch-Schönlein Purpura (HSP)**, which is considered the systemic version of the same disease spectrum [1]. * **Prognosis:** The most reliable histological predictor of progression is the presence of **crescents** or significant fibrosis (Oxford/MEST-C score) [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 928-929. [2] 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.

Question 269: Glomerulonephritis associated with sensory neuronal deafness is seen in which condition?

A. Nail patella syndrome
B. Alport syndrome (Correct Answer)
C. Down syndrome
D. Fabry's disease

Explanation: **Explanation:** **Alport Syndrome** is a hereditary glomerulonephritis caused by mutations in the genes encoding the **Type IV collagen** alpha chains (specifically $\alpha3$, $\alpha4$, or $\alpha5$). Type IV collagen is a critical structural component of basement membranes in the kidney (GBM), the inner ear (cochlea), and the eye. * **Pathogenesis:** Defects in collagen lead to a thinning and subsequent splitting of the glomerular basement membrane (GBM) [1]. * **Clinical Triad:** It classically presents with **Hereditary Nephritis** (hematuria progressing to ESRD), **Sensorineural Hearing Loss** (due to involvement of the organ of Corti), and **Ocular defects** (e.g., anterior lenticonus) [1]. **Analysis of Incorrect Options:** * **A. Nail Patella Syndrome:** An autosomal dominant disorder (LMX1B mutation) characterized by "skeletal-renal" syndrome. While it involves GBM thickening and renal failure, the extra-renal features are orthopedic (hypoplastic nails, absent patellae, iliac horns), not deafness. * **C. Down Syndrome:** Primarily associated with congenital heart defects (AVSD) and early-onset Alzheimer’s, but not a specific hereditary glomerulonephritis with deafness. * **D. Fabry’s Disease:** An X-linked lysosomal storage disorder (alpha-galactosidase A deficiency). It causes renal failure and skin lesions (angiokeratomas), but the hearing loss is less characteristic than the classic Alport triad. **High-Yield Pearls for NEET-PG:** * **Inheritance:** Most common is **X-linked Dominant** (COL4A5) [1]. * **Electron Microscopy (EM):** Pathognomonic **"Basket-weave appearance"** due to irregular thinning and thickening/lamination of the GBM. * **Ocular Finding:** **Anterior lenticonus** is highly specific for Alport syndrome. * **Light Microscopy:** May show "Foam cells" (interstitial cells laden with lipids) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 929-930.

Question 270: Sickle cell disease is associated with which type of renal cell carcinoma?

A. Medullary (Correct Answer)
B. Papillary
C. Chromophobe
D. Collecting duct

Explanation: **Explanation:** **Renal Medullary Carcinoma (RMC)** is a rare but highly aggressive tumor that occurs almost exclusively in young patients (mean age ~20 years) who carry the **Sickle Cell Trait (HbAS)** or have **Sickle Cell Disease (HbSS)**. The underlying pathophysiology involves the hypoxic and hypertonic environment of the renal medulla, which promotes the sickling of red blood cells in the vasa recta [1]. This leads to chronic ischemia, DNA damage, and the characteristic loss of the **SMARCB1 (INI1)** tumor suppressor gene expression, which is the molecular hallmark of this malignancy. **Analysis of Incorrect Options:** * **B. Papillary RCC:** This is the second most common type of RCC [3]. It is associated with trisomy 7 and 17 and is often seen in patients with End-Stage Renal Disease (ESRD) or Acquired Cystic Kidney Disease, but not specifically with Sickle Cell Disease [3]. * **C. Chromophobe RCC:** This type originates from intercalated cells of the collecting ducts [2]. It is associated with Birt-Hogg-Dubé syndrome and is characterized by "plant-like" cells with prominent cell membranes and perinuclear halos [2]. * **D. Collecting Duct Carcinoma (Bellini Duct):** While it also arises in the medulla, it is not associated with hemoglobinopathies. RMC was historically considered a subtype of collecting duct carcinoma but is now recognized as a distinct entity due to its specific association with sickle cell trait. **High-Yield Clinical Pearls for NEET-PG:** * **Molecular Marker:** Loss of **INI1 (SMARCB1)** protein expression on immunohistochemistry. * **Demographics:** Typically affects young African-American males. * **Prognosis:** Extremely poor; most patients present with metastatic disease at the time of diagnosis. * **Location:** Almost always involves the right kidney. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 948-949. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 959. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 958-959.

Practice by Chapter

Congenital Anomalies of the Kidney

Practice Questions

Glomerular Diseases

Practice Questions

Tubular and Interstitial Diseases

Practice Questions

Vascular Diseases of the Kidney

Practice Questions

Cystic Diseases of the Kidney

Practice Questions

Urinary Tract Obstruction and Stones

Practice Questions

Renal Tumors

Practice Questions

Kidney in Systemic Diseases

Practice Questions

Renal Transplantation Pathology

Practice Questions

Urinary Tract Infections

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free