Renal Pathology — MCQs

Renal Pathology Indian Medical PG Practice Questions and MCQs

Question 551: Most specific test for diagnosing Fabry disease on kidney biopsy?

A. Silver stain
B. H&E stain
C. PAS stain
D. Electron microscopy (Correct Answer)

Explanation: ***Electron microscopy*** - **Electron microscopy** is the most specific test as it can visualize the characteristic **lamellated zebra bodies** (lysosomal inclusions of globotriaosylceramide) in various cell types, including podocytes, which are pathognomonic for Fabry disease. - While other stains might show lipid accumulation, EM provides the definitive ultrastructural evidence by identifying the specific morphology of the accumulated glycosphingolipids. *Silver stain* - **Silver stains** are primarily used to highlight **reticular fibers**, basement membranes, or certain microorganisms, and are not specific for the lipid inclusions seen in Fabry disease. - They would not differentiate Fabry inclusions from other forms of cellular deposits or normal cellular components. *H&E stain* - **Hematoxylin and Eosin (H&E) stain** is a general histological stain that can show enlarged podocytes or vacuolization in Fabry disease, but these findings are **non-specific** and can be seen in other conditions. - H&E does not specifically highlight the characteristic lysosomal lipid inclusions. *PAS stain* - **Periodic Acid-Schiff (PAS) stain** detects **carbohydrates** and mucosubstances and may stain some of the accumulated glycosphingolipids with variable intensity. - However, PAS staining is not specific for the diagnosis of Fabry disease, as other conditions can also show PAS-positive material, and it does not reveal the characteristic lamellated structure of the inclusions.

Question 552: Characteristic feature of membranous nephropathy on electron microscopy?

A. Subepithelial deposits (Correct Answer)
B. No deposits
C. Mesangial deposits
D. Subendothelial deposits

Explanation: ***Subepithelial deposits*** - The presence of **subepithelial immune complex deposits** is the hallmark feature differentiating **membranous nephropathy** from other glomerular diseases on electron microscopy [1]. - These deposits are located between the **glomerular basement membrane (GBM)** and the podocytes, triggering localized inflammation and thickening of the GBM [1]. *No deposits* - While some conditions like **minimal change disease** may show no visible deposits on electron microscopy, this finding is inconsistent with **membranous nephropathy**, which is defined by immune complex deposition. - This condition is characterized by diffuse effacement of **podocyte foot processes** but lacks organized immune deposits [1]. *Mesangial deposits* - **Mesangial deposits** are characteristic of conditions like **IgA nephropathy** or early stages of lupus nephritis, where immune complexes primarily accumulate within the mesangium, the central part of the glomerulus [1]. - This location is distinct from the **subepithelial space** seen in membranous nephropathy, where deposits are outside the capillaries, beneath the podocytes [1]. *Subendothelial deposits* - **Subendothelial deposits** are typically found in diseases such as **lupus nephritis (Class III or IV)** or **membranoproliferative glomerulonephritis (Type I)**, where immune complexes are situated between the endothelium and the glomerular basement membrane [1]. - This location is anatomically distinct from the **subepithelial deposits** characteristic of membranous nephropathy [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 911, 921.

Question 553: A patient with diabetes presents with kidney dysfunction and nodular glomerulosclerosis. What is the underlying process?

A. Basement membrane thickening
B. Amyloid deposition
C. Mesangial expansion (Correct Answer)
D. Hyaline arteriosclerosis

Explanation: ***Mesangial expansion*** - Nodular glomerulosclerosis, characteristic of **Kimmelstiel-Wilson lesions** in diabetic nephropathy, is primarily due to the **expansion of the mesangial matrix** and cells [1]. - This mesangial expansion leads to the formation of discrete, PAS-positive, and typically pericapillary nodules [1]. *Basement membrane thickening* - While **glomerular basement membrane (GBM) thickening** is a hallmark of diabetic nephropathy, it typically occurs early and diffusely [2]. - It is a precursor to more advanced changes but does not directly explain the formation of the distinct **nodular lesions** seen in advanced stages [2]. *Amyloid deposition* - **Amyloid deposition** can cause kidney dysfunction and enlargement, but it is a distinct pathological process characterized by the basis of accumulation of misfolded proteins. - It typically presents with a different microscopic appearance (e.g., Congo red positivity, apple-green birefringence) and is not the primary cause of nodular glomerulosclerosis in diabetes. *Hyaline arteriosclerosis* - **Hyaline arteriosclerosis** affects the afferent and efferent arterioles in the kidney, often seen in hypertension and diabetes, and contributes to renal ischemia and capillary damage [3]. - However, it represents damage to the **arterioles** and not directly the formation of the **nodular lesions within the glomeruli** [1]. **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. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 907-908.

Question 554: Which renal pathology is characterized by crescent formation in the glomeruli?

A. Focal segmental glomerulosclerosis
B. Membranous glomerulonephritis
C. Diffuse proliferative glomerulonephritis
D. Rapidly progressive glomerulonephritis (Correct Answer)

Explanation: ***Rapidly progressive glomerulonephritis*** - This condition is histologically defined by the presence of **crescent formation** in a significant number of glomeruli [1]. - **Crescents** are formed by the proliferation of parietal epithelial cells, inflammatory cells, and fibrin within Bowman's space, indicating severe glomerular injury [1]. *Focal segmental glomerulosclerosis* - This pathology is characterized by **segmental sclerosis** and hyalinosis of some glomeruli, rather than widespread crescent formation. - It often leads to **nephrotic syndrome** and can progress to end-stage renal disease, but crescents are not its defining feature. *Membranous glomerulonephritis* - Characterized by diffuse thickening of the **glomerular basement membrane** due to immune complex deposition, often appearing as "spikes" and "domes" on electron microscopy. - It typically presents as **nephrotic syndrome** and does not primarily involve crescent formation. *Diffuse proliferative glomerulonephritis* - This condition involves diffuse proliferation of **endothelial and mesangial cells** within the glomeruli, often seen in post-streptococcal glomerulonephritis [1]. - While it can be severe, **crescent formation** is not its defining or most characteristic feature, usually being focal if present. **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.

Question 555: A young woman with systemic lupus erythematosus (SLE) presents with nephrotic syndrome. Which renal pathology is most commonly associated with SLE?

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

Explanation: ***Diffuse proliferative glomerulonephritis*** - This is the **most common and most severe form** of lupus nephritis (WHO Class IV) [1], seen in 35-60% of SLE patients with renal involvement, accounting for the highest proportion of those presenting with **nephrotic syndrome and renal impairment** [2]. - It involves diffuse proliferation of **endothelial and mesangial cells** affecting >50% of glomeruli [1], often with **immune complex deposition** in the subendothelial space, leading to significant inflammation and potential renal damage. - Patients typically present with a **mixed nephrotic-nephritic picture** with proteinuria, hematuria, hypertension, and declining renal function [2]. *Membranous nephropathy* - While it can occur in SLE patients (WHO Class V lupus nephritis), it's less common than diffuse proliferative glomerulonephritis and typically presents with **pure nephrotic syndrome** [2]. - It is characterized by **subepithelial immune complex deposition** and thickening of the glomerular basement membrane without significant cellular proliferation. *Focal segmental glomerulosclerosis* - This pathology can be associated with SLE, but it is **less frequent** than diffuse proliferative glomerulonephritis as the primary renal manifestation. - It is characterized by **segmental sclerosis** in some glomeruli and is more commonly associated with nephrotic syndrome or secondary causes like HIV-associated nephropathy [3]. *Minimal change disease* - This is a rare association with SLE and is more commonly seen as a primary idiopathic condition, predominantly in children. - It presents with **nephrotic syndrome** and shows no changes on light microscopy, with only **effacement of foot processes** on electron microscopy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 230-232. [2] 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. [3] 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 556: A kidney biopsy from a patient with hematuria and proteinuria shows segmental sclerosis of the glomeruli. What is the most likely diagnosis?

A. Minimal Change Disease
B. Focal Segmental Glomerulosclerosis (Correct Answer)
C. Membranous Nephropathy
D. IgA Nephropathy

Explanation: ***Focal Segmental Glomerulosclerosis*** - Segmental sclerosis of the glomeruli is a defining characteristic of focal segmental glomerulosclerosis (FSGS) [1][2]. - It commonly presents with **hematuria** and **proteinuria**, making it the most likely diagnosis in this case [1][3]. *Minimal Change Disease* - Typically presents with **nephrotic syndrome** and does not show segmental sclerosis on biopsy [3][4]. - It is more common in children and is characterized by **foot process fusion** rather than scarring [3][4]. *IgA Nephropathy* - Often associated with **IgA deposition** in the mesangium and usually presents with **episodic hematuria** rather than segmental sclerosis. - There may be some proteinuria, but it is generally less prominent compared to FSGS. *Membranous Nephropathy* - Characterized by **thickening of the glomerular basement membrane** without segmental sclerosis [2][3]. - Presents often with **nephrotic syndrome** and is associated with **anti-PLA2R antibodies**, which are not indicated here [3]. **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. 530-531. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 531-532. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 922-923.

Question 557: A 5-year-old child presents with a large abdominal mass. Histological examination reveals small, round blue cells. Which tumor is consistent with these findings?

A. Hepatoblastoma
B. Rhabdomyosarcoma
C. Wilms tumor
D. Neuroblastoma (Correct Answer)

Explanation: ***Wilms tumor*** - This tumor commonly presents as a **large abdominal mass** in children, especially around the age of 5 [1][2]. - Histological examination typically shows **small, round blue cells**, characteristic of this tumor type [1]. *Hepatoblastoma* - Usually presents in younger children with **liver involvement**, characterized by a **different histological pattern**, such as embryonal liver cells [2]. - It often shows **elevated alpha-fetoprotein (AFP)** levels, which are not mentioned in this case. *Rhabdomyosarcoma* - This tumor is associated with **soft tissue masses**, generally arises in older children and typically shows striated muscle differentiation. - While it can present with small, round blue cells histologically, it has a **different anatomical distribution** compared to Wilms tumor. *Neuroblastoma* - Commonly found in the **adrenal glands** or sympathetic chain, it can present as an abdominal mass but usually shows **neuroblastic differentiation** histologically, not just small blue cells [2]. - Often associated with **elevated catecholamines** and may spread to the bones or lymph nodes, rather than primarily presenting as a renal mass. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 488-490. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 211-212.

Question 558: A 40-year-old woman with a history of lupus presents with swelling and proteinuria. A kidney biopsy shows thickened glomerular capillary walls and subepithelial deposits. What is the most likely diagnosis?

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

Explanation: ***Membranous nephropathy*** - The presence of **thickened glomerular capillary walls** with **subepithelial deposits** in the biopsy is characteristic of membranous nephropathy [1][4], commonly associated with lupus [2]. - Patients typically present with **nephrotic syndrome**, including **swelling** and **proteinuria**, aligning with the clinical presentation [4]. - In membranous glomerulonephritis, epithelial cells overlying subepithelial deposits are stimulated to produce basement membrane material, resulting in an abnormal, thickened basement membrane that initially separates and then envelops the deposits [3]. *IgA nephropathy* - This condition presents with **mesangial deposits** and is often associated with **hematuria**, not just proteinuria or nephrotic syndrome. - The biopsy findings do not show the **thickened capillary walls** seen in membranous nephropathy. *Minimal change disease* - Typically characterized by **normal glomerular appearance** under light microscopy, with podocyte damage seen in electron microscopy, not thickened walls. - Symptoms generally include **nephrotic syndrome** but do not correlate with the biopsy findings seen here. *Focal segmental glomerulosclerosis* - Generally identified by **segmental scarring** on biopsy and may present with nephrotic syndrome, but lacks the classic subepithelial deposits of membranous nephropathy. - Associated with various secondary causes, often not specifically linked to lupus and wouldn't show thickened walls like in this case. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 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. 532-533. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 529-530. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 919-921.

Question 559: A 55-year-old woman with a history of lupus presents with hematuria and nephrotic syndrome. Her renal biopsy shows 'wire-loop' glomerular lesions. What is the primary pathogenesis behind this finding?

A. Deposition of IgA in the mesangium
B. Hyperfiltration of the glomeruli
C. Deposition of immune complexes in the subendothelial space (Correct Answer)
D. Formation of glomerular crescents

Explanation: ***Deposition of immune complexes in the subendothelial space*** - This is the hallmark of **Class IV lupus nephritis**, characterized by diffuse proliferative glomerulonephritis and the classic **wire-loop lesions** [1], [2]. - **Immune complexes** composed of autoantibodies (especially anti-dsDNA) and nuclear antigens deposit in the subendothelial space, activating complement and leading to inflammation and cellular proliferation [1], [2]. *Deposition of IgA in the mesangium* - This is characteristic of **IgA nephropathy**, a common cause of glomerulonephritis, but it is not associated with lupus and typically does not present with **wire-loop lesions** [1]. - While IgA nephropathy can cause hematuria, the presence of **lupus** and **nephritic syndrome** points away from this diagnosis. *Hyperfiltration of the glomeruli* - **Hyperfiltration** can occur in various renal conditions, especially in early diabetic nephropathy or compensatory changes after renal mass loss, but it is a functional change, not a primary pathological finding that explains **wire-loop lesions** or active inflammation. - It does not represent the underlying **immune-mediated injury** seen in lupus nephritis. *Formation of glomerular crescents* - **Crescent formation** is a feature of rapidly progression glomerulonephritis (RPGN), which can be seen in severe forms of lupus nephritis (often Class IV or Class III with crescents) [2]. - While crescents indicate severe glomerular injury and can cause nephritic syndrome, the specific 'wire-loop' lesion points more directly to extensive **subendothelial immune complex deposition** as the primary pathological process [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 911. [2] 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. [3] 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.

Question 560: What type of glomerulonephritis is associated with systemic lupus erythematosus and often involves "wire-loop" lesions?

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

Explanation: ***Diffuse proliferative glomerulonephritis*** - This is the most common and severe form of **lupus nephritis**, often leading to significant renal damage [1]. - Presence of **"wire-loop" lesions** on light microscopy, representing subendothelial immune complex deposits, is a classic histopathologic feature [1]. *Focal segmental glomerulosclerosis* - Characterized by **scarring of some glomeruli** and only a portion of the glomerular tuft, not a global process [2]. - While it can be secondary to lupus nephritis, it does not typically present with "wire-loop" lesions and is not the primary form of active lupus nephritis with systemic involvement. *Membranous glomerulonephritis* - Identified by **subepithelial immune complex deposits** that can cause thickening of the glomerular basement membrane and a "spike and dome" appearance on microscopy [2]. - Though it can occur in lupus nephritis (Class V), it is typically associated with different pathological features than the "wire-loop" lesions of proliferative types [2]. *Minimal change disease* - Characterized by the **absence of significant changes** on light microscopy, with only effacement of podocyte foot processes on electron microscopy [2]. - This condition is the most common cause of **nephrotic syndrome in children** and is rarely associated with systemic lupus erythematosus [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 230-232. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 919-921.

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