Renal Pathology — MCQs

Renal Pathology Indian Medical PG Practice Questions and MCQs

Question 591: What is the most common histological type of nephritis seen in systemic lupus erythematosus (SLE)?

A. Mesangial
B. Focal proliferative
C. Diffuse proliferative (Correct Answer)
D. Membranous

Explanation: ***Diffuse proliferative*** - This type is the most common form of nephritis associated with **systemic lupus erythematosus (SLE)** [1], characterized by extensive involvement of the renal glomeruli. - It presents with a combination of **proliferative lesions** and often leads to significant **renal impairment** and nephrotic syndrome [1]. *Membranous* - This type is less common in SLE and is more often associated with other conditions such as **infections** or **drugs**. - Histologically, it presents with **thickening of the glomerular membrane**, which is not the predominant feature in SLE. *Focal proliferative* - While focal proliferative glomerulonephritis can occur in SLE, it is not the most common subtype; it typically involves less than **50% of the glomeruli** [2]. - It usually presents with a milder clinical picture compared to **diffuse proliferative nephritis** [2]. *Mesangial* - Mesangial nephritis is characterized by **increased mesangial cell proliferation** and matrix expansion but does not account for the significant renal pathology seen in most SLE cases. - It is a less common type and often occurs alongside other forms of lupus nephritis rather than being the primary form. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 232. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 230-232.

Question 592: Which of the following conditions is characterized by subendothelial electron-dense deposits within the glomerulus?

A. MPGN type I (Correct Answer)
B. Crescentic glomerulonephritis
C. Dense deposit disease
D. IgA nephropathy

Explanation: ***MPGN type I*** - Subendothelial **electron-dense deposits** are characteristic of Membranoproliferative Glomerulonephritis (MPGN) type I [1]. - This condition is often associated with **immune complex deposition** and can involve the presence of complement abnormalities [1]. *IgA nephropathy* - Characterized by **IgA deposition** within the mesangial regions, not subendothelial deposits. - Typically presents with **hematuria** and **proteinuria** rather than electron-dense deposits. *Crescentic glomerulonephritis* - Primarily involves the formation of **crescents** in Bowman's space due to severe glomerular injury rather than subendothelial deposits. - Associated with **rapidly progressive renal failure** and **anti-GBM antibodies** or ANCA positivity. *Dense deposit disease* - Characterized by **intramembranous deposits** not subendothelial ones [1]. - Often associated with **C3 nephritic factor** leading to complement-mediated disease, distinct from MPGN type I. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 925-927.

Question 593: Kimmelstiel-Wilson lesion is characteristic of which condition?

A. Diabetic nephropathy (Correct Answer)
B. HIV nephropathy
C. MPGN
D. Hypertensive nephropathy

Explanation: ***Diabetic nephropathy*** - Kimmelstiel-Wilson lesions are pathognomonic for **diabetic nephropathy**, appearing as nodular glomerulosclerosis [1]. - These lesions result from **hyperglycemia** leading to mesangial expansion and thickening of the glomerular basement membrane [2]. *HIV nephropathy* - Characterized by **focal segmental glomerulosclerosis** (FSGS) rather than Kimmelstiel-Wilson lesions. - Often presents with **proteinuria** and occurs in the context of **immune suppression**. *MPGN* - Membranoproliferative glomerulonephritis (MPGN) is associated with **proliferative glomerular changes** rather than Kimmelstiel-Wilson lesions. - Patients typically display **nephritic syndrome** with hematuria and decreased complement levels. *Hypertensive nephropathy* - Usually leads to **arteriosclerosis and hyaline changes** in the kidney, not Kimmelstiel-Wilson lesions. - Nephropathy manifests with **chronic kidney disease** and associated hypertension, without the specific lesion noted. **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 594: Which part of the kidney is first affected by ischemia in the context of acute kidney injury?

A. Cortex
B. Inner medulla
C. Outer medulla (Correct Answer)
D. Glomerulus

Explanation: ***Outer medulla*** - The **outer medulla** is particularly vulnerable to ischemia due to its high metabolic demand and limited blood supply. - Ischemic damage typically begins here as it receives blood supply from the **vasa recta**, which are more susceptible to drops in perfusion pressure. *Glumerulus* - The **glomerulus** is primarily affected in conditions like **glomerulonephritis**, not in acute ischemic injury where tubular structures are first impacted [1]. - It is well-perfused under normal conditions, making it less likely to be the first area affected during acute kidney injury. *Cortex* - The **cortex** is indeed involved in acute kidney damage but is not the first area affected by ischemia. - The cortical region can withstand lower perfusion volumes for a shorter time compared to the outer medulla. *Inner medulla* - The **inner medulla** is the last area to suffer from ischemic damage as it is more tolerant to **hypoxic conditions**. - It primarily encounters ischemia after the outer medulla has already been compromised, thus not the first area affected. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 933.

Question 595: If a kidney biopsy is done in a patient with bronchogenic carcinoma who presents with nephrotic syndrome, which lesion will most likely be seen?

A. Membranous GN (Correct Answer)
B. Focal segmental glomerulosclerosis
C. Focal proliferative GN
D. Minimal change disease

Explanation: ***Membranous GN*** - **Membranous glomerulonephritis (MGN)** is the most common cause of **paraneoplastic nephrotic syndrome** in adults, especially in association with solid tumors such as **bronchogenic carcinoma** [1]. - The tumor releases antigens, forming **immune complexes** that deposit in the glomerular basement membrane, leading to characteristic **subepithelial deposits** with a granular pattern of IgG and C3 on immunofluorescence [1]. *Focal proliferative GN* - **Focal proliferative glomerulonephritis** is less commonly associated with solid tumors causing nephrotic syndrome. - It is more typically seen in immune complex-mediated diseases like **IgA nephropathy** or **lupus nephritis**, where it might present with hematuria and proteinuria rather than pure nephrotic syndrome. *Minimal change disease* - While a common cause of nephrotic syndrome in children, and sometimes in adults, **minimal change disease** is rarely paraneoplastic [1]. - It is characterized by **diffuse effacement of foot processes** on electron microscopy without significant immune complex deposition [1]. *Focal segmental glomerulosclerosis* - Although **focal segmental glomerulosclerosis (FSGS)** can cause nephrotic syndrome in adults, it is not the most common paraneoplastic glomerulopathy with solid tumors [2]. - FSGS involves **segmental scarring** of some glomeruli and is associated with various secondary causes like viral infections (HIV) or drug use, but less frequently with bronchogenic carcinoma directly [1], [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 919-921, 927-928. [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 596: A patient with chronic hypertension will show which of the following changes on histology of the kidney?

A. Vessel lumen dilatation
B. Hyperplastic arteriosclerosis
C. Hyaline arteriosclerosis (Correct Answer)
D. Fibrinoid necrosis

Explanation: ***Hyaline arteriosclerosis*** - This condition is characterized by **homogeneous pink appearance** of arterial walls on histology due to plasma protein leakage, commonly seen in chronic hypertension [1]. - It represents **injury** and **remodeling** of the renal vasculature due to the prolonged pressure load, often leading to renal impairment [1,2]. *Onion skin lesions* - Typically associated with **hyperplasia of smooth muscle cells** in the walls of arteries, seen more in conditions like **malignant hypertension** [3,4]. - These lesions are not a hallmark of chronic hypertension, where changes are more subtle and involve primarily hyaline changes [3]. *Hyperplastic arteriosclerosis* - Involves **proliferation of smooth muscle cells and fibroblasts**, leading to a thickened wall, usually noted in cases of acute or severe hypertension [4,5]. - It is less common compared to **hyaline arteriosclerosis** in chronic hypertension scenarios, which is characterized by more insidious changes [3]. *Vessel lumen dilatation* - Typically not observed in chronic hypertension; chronic changes lead to **narrowing** due to arterial wall thickening [1]. - Rather, chronic hypertension results in **stenosis** and not an **enlargement** of vessel lumens [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 943-945. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 541-542. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 498-499. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 945. [5] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 276-277.

Question 597: Which condition is characterized by wire loop lesions in the glomeruli?

A. IgA nephropathy
B. Systemic Lupus Erythematosus (SLE) (Correct Answer)
C. Amyloidosis
D. Membranous nephropathy

Explanation: ***SLE*** - Wire loop lesions in glomeruli are a classic histological finding in **Systemic Lupus Erythematosus (SLE)**, indicating severe glomerulonephritis. - These lesions result from **subendothelial immune complex deposits**, leading to a distinctive appearance on renal biopsy [1]. *Amyloidosis* - Characterized by **polarized light appearance** of apple-green birefringence due to amyloid deposits, not wire loop lesions. - Renal involvement occurs with **nodular glomerulosclerosis**, shown by different histological patterns. *Nephrotic* - Refers to a syndrome characterized by **heavy proteinuria**, **hypoalbuminemia**, and **edema**, but not specifically wire loop lesions. - The histopathology typically reveals **minimal change disease** or **focal segmental glomerulosclerosis**, not wire loops. *IgA nephropathy* - Generally presents with **IgA deposits** in mesangial regions causing **hematuria** and mild proteinuria. - It does not exhibit wire loop lesions, which are characteristic of **lupus nephritis** [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 232.

Question 598: The characteristic immunoglobulin abnormality in IgA nephropathy is:

A. Complement C5b-9
B. Galactose-deficient IgA1 (Correct Answer)
C. TGF-β
D. Interleukin-6

Explanation: ***Galactose-deficient IgA1*** - **IgA nephropathy** is characterized by the presence of circulating **galactose-deficient IgA1** molecules, which are recognized as autoantigens. - These abnormal IgA1 molecules deposit in the **glomeruli**, leading to inflammation and kidney damage. *Complement C5b-9* - **Complement C5b-9** is the **membrane attack complex (MAC)**, a component of the complement cascade involved in tissue damage. - While complement activation occurs in IgA nephropathy, C5b-9 is a downstream effector, not the primary immunoglobulin abnormality. *TGF-β* - **TGF-β** is a **cytokine** involved in fibrosis and immune regulation, playing a role in the progression of kidney disease. - It is not an immunoglobulin and does not represent the primary immunologic abnormality in IgA nephropathy. *Interleukin-6* - **Interleukin-6 (IL-6)** is a **pro-inflammatory cytokine** involved in immune responses and B cell differentiation. - Although IL-6 may contribute to the inflammatory process in IgA nephropathy, it is not the characteristic immunoglobulin abnormality.

Question 599: Which of the following histological features is characteristic of Alport syndrome?

A. Diffuse thinning of the glomerular basement membrane
B. Irregularities in the lamina densa
C. Interstitial fibrosis and glomerulosclerosis
D. Basket weave appearance of the glomerular basement membrane (Correct Answer)

Explanation: ***Basket weave appearance of the glomerular basement membrane*** - This characteristic **basket weave appearance** with splitting, lamination, and thickening/thinning of the **lamina densa** is a classic ultrastructural finding in Alport syndrome, identifiable with electron microscopy. - It results from mutations in **Type IV collagen**, which is a crucial component of the GBM. *Diffuse thinning of the glomerular basement membrane* - While Alport syndrome can present with areas of focal thinning, **diffuse thinning of the glomerular basement membrane** alone is more characteristic of **thin basement membrane disease** (benign familial hematuria). - Alport syndrome typically shows abnormal thickness and lamellation in addition to thinning. *Irregularities in the lamina densa* - **Irregularities in the lamina densa** are a general feature of many glomerular diseases; however, the specific **basket weave appearance** with splitting and variable thickness is what distinguishes Alport syndrome. - This option is too general and doesn't capture the unique ultrastructural changes seen in Alport syndrome. *Interstitial fibrosis and glomerulosclerosis* - **Interstitial fibrosis and glomerulosclerosis** are features that develop in the later stages of many progressive kidney diseases, including Alport syndrome, representing **chronic kidney damage**. - These are common non-specific findings of established kidney disease and not an early, characteristic histological feature for diagnosing Alport syndrome.

Question 600: The prognosis of rapidly progressive glomerulonephritis (crescentic GN) depends on

A. Number of crescents (Correct Answer)
B. Size of crescents
C. Cellularity of crescents
D. Shape of crescents

Explanation: ***Number of crescents*** - The **number of glomeruli affected by crescents** is the most significant prognostic indicator in rapidly progressive glomerulonephritis. A higher percentage of crescentic glomeruli correlates with worse renal function outcomes. - A **renal biopsy finding of fewer than 25% crescentic glomeruli** often indicates a better prognosis with potential for recovery, while **more than 50% involvement** suggests a poor prognosis with a high likelihood of end-stage renal disease. *Size of crescents* - While crescents vary in size, the **extent of glomerular involvement (percentage of glomeruli with crescents)** is more clinically relevant for prognosis than the individual size of each crescent. - The size of an individual crescent does not independently predict renal outcome as effectively as the overall burden of crescentic disease. *Shape of crescents* - The **shape of crescents (e.g., circumferential vs. segmental)** is a descriptive feature but does not independently determine the prognosis. - The critical factor remains the **presence and number of crescents**, as these signify severe glomerular injury, regardless of their specific morphology. *Cellularity of crescents* - Crescents can be **cellular, fibrocellular, or fibrous**. The composition reflects the stage of injury and healing, with fibrous crescents indicating chronic, irreversible damage [1]. - Although the **cellularity of crescents indicates activity and potential for reversibility**, the *number of affected glomeruli* (i.e., the extent of crescent formation) remains the primary determinant of renal prognosis [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.

Practice by Chapter

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Glomerular Diseases

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Cystic Diseases of the Kidney

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Renal Tumors

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Urinary Tract Infections

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