Renal Pathology Practice Questions

Q: A 5-year-old child presented with edema for the last few months. It started on the face but now it is generalized with pedal edema as well as ascites. He showed good response to steroids. His blood pressure was normal. On urine examination the findings were unremarkable. On electron microscopy of kidney biopsy, effacement of podocytes was seen. Identify the given condition.

A. Minimal change disease. ***Minimal change disease*** - This condition is characterized by **edema**, especially periorbital, in a young child with **normal blood pressure** and a good response to **steroids**. - **Electron microscopy showing effacement of podocytes** is the characteristic histological finding despite a normal light microscopy (hence "minimal change"). *Poststreptococcal glomerulonephritis* - Typically presents with **hematuria**, hypertension, and oliguria, often 1-3 weeks after a **streptococcal infection**. - It does not usually show a dramatic response to steroids, and electron microscopy would reveal **subepithelial humps**, not just podocyte effacement. *Focal segmental glomerulosclerosis* - Although it can present with **nephrotic syndrome** and podocyte effacement, it is often **steroid-resistant** and progresses to chronic kidney disease. - The "focal" and "segmental" scarring would be visible on light microscopy, which is not described as unremarkable here. *Membranous glomerulonephritis* - More common in **adults** and is characterized by **thickened glomerular basement membranes** on light microscopy. - Electron microscopy would show **subepithelial immune deposits** and spike formation, which is different from isolated podocyte effacement.

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

Mesangial expansion. ***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.

Q: Von Hippel-Lindau syndrome is associated with which type of renal neoplasm?

Renal clear cell carcinoma. ***Renal clear cell carcinoma*** - **Von Hippel-Lindau (VHL) syndrome** is strongly associated with the development of **renal clear cell carcinoma**, often manifesting as multiple or bilateral tumors [2]. - The VHL gene is a **tumor suppressor gene**, and its inactivation in VHL syndrome predisposes to the growth of various tumors, including clear cell renal carcinomas [2]. *Transitional cell carcinoma* - This type of carcinoma originates from the **urothelium** lining the renal pelvis, ureters, or bladder, and is not directly associated with VHL syndrome. - Risk factors for transitional cell carcinoma often include **smoking** and exposure to certain industrial chemicals. *Wilms tumor* - **Wilms tumor (nephroblastoma)** is a childhood kidney cancer, typically presenting before the age of 5. - It is associated with mutations in the **WT1 gene** and other genetic syndromes like WAGR syndrome and Denys-Drash syndrome, not VHL syndrome. *Renal oncocytoma* - **Renal oncocytomas** are benign epithelial tumors of the kidney, characterized by eosinophilic granular cells [1]. - While they can mimic renal cell carcinoma on imaging, they are generally not associated with VHL syndrome [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 959. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 959-961.

Q: 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?

Neuroblastoma. ***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.

Q: What renal pathology is characterized by subepithelial immune complex deposits and a "spike and dome" appearance on electron microscopy?

Membranous nephropathy. ***Membranous nephropathy*** - Characterized by **subepithelial immune complex deposits** and a distinctive **"spike and dome" appearance** on electron microscopy [1][2]. - Often presents with **nephrotic syndrome**, leading to significant proteinuria and edema [2]. *Minimal change disease* - Usually associated with **loss of podocyte foot processes** but does not show the "spike and dome" appearance on electron microscopy [2]. - Characterized by **selective proteinuria**, mainly albumin, and typically responds well to steroids [2]. *IgA nephropathy* - Primarily affects the **mesangial deposits of IgA** and causes **hematuria** rather than significant proteinuria. - Commonly presents with symptoms after **upper respiratory infections**, which is not typical for membranous nephropathy. *Focal segmental glomerulosclerosis* - Characterized by **sclerosis** in certain segments of the glomeruli, not subepithelial deposits. - Presents with **nephrotic syndrome**, but lacks the characteristic findings seen in membranous nephropathy [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. 529-530, 532-533.

Question 1

A 5-year-old child presented with edema for the last few months. It started on the face but now it is generalized with pedal edema as well as ascites. He showed good response to steroids. His blood pressure was normal. On urine examination the findings were unremarkable. On electron microscopy of kidney biopsy, effacement of podocytes was seen. Identify the given condition.

Accepted Answer

A. Minimal change disease

Answer

B. Poststreptococcal glomerulonephritis

Answer

C. Focal segmental glomerulosclerosis

Answer

D. Membranous glomerulonephritis

Question 2

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

Accepted Answer

Mesangial expansion

Answer

Basement membrane thickening

Answer

Amyloid deposition

Answer

Hyaline arteriosclerosis

Question 3

Von Hippel-Lindau syndrome is associated with which type of renal neoplasm?

Accepted Answer

Renal clear cell carcinoma

Answer

Transitional cell carcinoma

Answer

Wilms tumor

Answer

Renal oncocytoma

Question 4

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

Accepted Answer

Diffuse proliferative glomerulonephritis

Answer

Membranous nephropathy

Answer

Focal segmental glomerulosclerosis

Answer

Minimal change disease

Question 5

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?

Accepted Answer

Neuroblastoma

Answer

Hepatoblastoma

Answer

Rhabdomyosarcoma

Answer

Wilms tumor

Question 6

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?

Accepted Answer

Membranous nephropathy

Answer

Focal segmental glomerulosclerosis

Answer

Minimal change disease

Answer

IgA nephropathy

Question 7

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?

Accepted Answer

Deposition of immune complexes in the subendothelial space

Answer

Deposition of IgA in the mesangium

Answer

Hyperfiltration of the glomeruli

Answer

Formation of glomerular crescents

Question 8

What is the pathophysiological basis of proteinuria in diabetic nephropathy?

Accepted Answer

Glomerular basement membrane thickening leads to increased permeability

Answer

Increased glomerular filtration rate can contribute to proteinuria

Answer

Loss of podocyte foot processes is the primary mechanism

Answer

Tubular reabsorption defect is the primary cause

Question 9

What renal pathology is characterized by subepithelial immune complex deposits and a "spike and dome" appearance on electron microscopy?

Accepted Answer

Membranous nephropathy

Answer

Minimal change disease

Answer

IgA nephropathy

Answer

Focal segmental glomerulosclerosis

Question 10

A 40-year-old woman with systemic lupus erythematosus (SLE) presents with symptoms including proteinuria, edema, and hypertension. What is the most likely renal pathology associated with her condition?

Accepted Answer

Glomerulonephritis leading to protein loss, fluid retention, and hypertension

Answer

Tubulointerstitial nephritis causing electrolyte imbalance and hypovolemia

Answer

Chronic pyelonephritis leading to decreased renal function and hyperkalemia

Answer

Renal vasculitis causing ischemic damage and acute tubular necrosis

Renal Pathology — MCQs

Renal Pathology — MCQs

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