Renal Pathology — MCQs

Renal Pathology Indian Medical PG Practice Questions and MCQs

Question 561: Which microscopic finding is characteristic of nephrotic syndrome in minimal change disease?

A. Mesangial deposits
B. Focal segmental glomerulosclerosis
C. Effacement of podocyte foot processes (Correct Answer)
D. Thickened glomerular basement membrane

Explanation: ***Effacement of podocyte foot processes*** - The hallmark microscopic finding in **minimal change disease** is the **effacement of podocyte foot processes** [1][2], leading to increased permeability of the glomerular filter. - This finding is crucial in the pathogenesis of **nephrotic syndrome**, resulting in significant proteinuria [2]. *Thickened glomerular basement membrane* - This finding is more characteristic of **membranous nephropathy** rather than minimal change disease. - In minimal change disease, the **glomerular basement membrane** typically appears normal under light microscopy. *Mesangial deposits* - **Mesangial deposits** are commonly seen in **IgA nephropathy** and other forms of glomerulonephritis, not in minimal change disease. - Minimal change disease often shows a **normal mesangial area** with no deposits. *Focal segmental glomerulosclerosis* - This is a separate pathological entity with its distinct features, often marked by **scarring** of the glomeruli, which is not seen in minimal change disease. - Minimal change disease typically shows complete **preservation of the glomeruli** on light microscopy, with no segments affected. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 913. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928.

Question 562: What is the pathophysiological basis of proteinuria in diabetic nephropathy?

A. Increased glomerular filtration rate can contribute to proteinuria
B. Loss of podocyte foot processes is the primary mechanism
C. Glomerular basement membrane thickening leads to increased permeability (Correct Answer)
D. Tubular reabsorption defect is the primary cause

Explanation: ***Glomerular basement membrane thickening leads to increased permeability*** - In diabetic nephropathy, sustained **hyperglycemia** leads to the accumulation of advanced glycation end products (AGEs) and activation of protein kinase C (PKC), which contribute to the thickening and stiffening of the **glomerular basement membrane (GBM)** [1]. - This thickening combined with altered charge properties and damage to the filtration barrier, results in increased permeability to proteins, allowing them to pass into the urine [1]. *Increased glomerular filtration rate can contribute to proteinuria* - While an initial increase in **glomerular filtration rate (GFR)** (hyperfiltration) can occur in early diabetic nephropathy, it typically leads to an overload of the tubular reabsorption capacity rather than directly causing the fundamental permeability defect that underlies sustained proteinuria. - The primary defect causing proteinuria in diabetic nephropathy is damage to the **glomerular filtration barrier**, not simply an increased flow. *Tubular reabsorption defect is the primary cause* - In diabetic nephropathy, the primary mechanism of proteinuria is damage to the **glomerular filtration barrier** (GBM and podocytes), not a primary tubular reabsorption defect. - While tubular cells can be overwhelmed by the increased protein load and may be damaged in advanced stages, this is a secondary consequence rather than the initiating mechanism of proteinuria. *Loss of podocyte foot processes is the primary mechanism* - **Podocyte effacement** (loss of foot processes) is a significant feature of diabetic nephropathy and indeed contributes significantly to proteinuria by disrupting the **slit diaphragm**, which is a crucial component of the filtration barrier [2]. - However, it works in concert with **GBM thickening** and altered GBM charge properties; GBM thickening is a more fundamental and pervasive change contributing to altered permeability [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1118-1121. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 907.

Question 563: 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?

A. Glomerulonephritis leading to protein loss, fluid retention, and hypertension (Correct Answer)
B. Tubulointerstitial nephritis causing electrolyte imbalance and hypovolemia
C. Chronic pyelonephritis leading to decreased renal function and hyperkalemia
D. Renal vasculitis causing ischemic damage and acute tubular necrosis

Explanation: ***Glomerulonephritis leading to protein loss, fluid retention, and hypertension*** - In systemic lupus erythematosus (SLE), **glomerulonephritis** occurs due to the deposition of **immune complexes** in the glomeruli [2][3][4], leading to significant **proteinuria** and **edema** [1]. - This condition contributes to **hypertension** by activating the renin-angiotensin-aldosterone system (RAAS) in response to renal impairment and fluid overload [1]. *Tubulointerstitial nephritis causing electrolyte imbalance and hypovolemia* - This condition typically presents with **renal tubular dysfunction**, leading to electrolyte imbalances, rather than significant **proteinuria or edema**. - SLE-related complications usually involve **glomerular** rather than **tubulointerstitial** pathology [1][3], making this option less relevant. *Chronic pyelonephritis leading to decreased renal function and hyperkalemia* - Characterized by recurrent urinary tract infections resulting in **scarring** of the kidneys, but the patient presents more with **glomerular symptoms** than **chronic infection** signs. - This oes not account for the presence of **immune complexes** [2][3] or the specific renal manifestations linked to SLE [1]. *Nephrotic syndrome causing hypercalcemia and reduced renal filtration* - Although nephrotic syndrome involves **proteinuria** and edema [1], it is not typically associated with **hypercalcemia**, which indicates an alternative pathology. - The functional aspect of **negative regulation in filtration** is not primarily a characteristic of the nephrotic syndrome related to autoimmune diseases like SLE [2]. **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. 532-533. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 226. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 232. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 230.

Question 564: What renal pathology is characterized by subepithelial immune complex deposits and a "spike and dome" appearance on electron microscopy?

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

Explanation: ***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 565: Loss of foot process is classical in case of?

A. Segmental glomerulosclerosis (Correct Answer)
B. Diabetic nephropathy (later stages)
C. Membranous nephropathy
D. IgA vasculitis

Explanation: ***Segmental glomerulosclerosis*** - Characterized by a **loss of foot processes**, leading to a "focal" or "segmental" pattern of sclerosis on histology [1][2]. - Often presents with **nephrotic syndrome**, including proteinuria and edema, due to damage to the glomeruli [1][3]. *Membranous glomerulitis* - Primarily involves **thickening of the glomerular capillary walls** without the loss of foot processes initially. - It is often associated with **membrane antibodies** and can lead to nephrotic syndrome, but not specifically linked to foot process loss [2]. *Diabetic nephropathy* - Characterized by **nodular glomerulosclerosis** and other microvascular changes, but the loss of foot processes is not a classic feature. - Typically presents with **diffuse glomerular basement membrane thickening** and eventual renal failure. *IgA nephropathy* - Characterized by the deposition of **IgA antibodies** in the mesangial area, leading to hematuria but not directly causing loss of foot processes. - Symptoms often include **recurrent episodes of hematuria** which can be triggered by infection, rather than nephrotic syndrome. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 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. 530-532. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 913.

Question 566: Struvite stones are primarily composed of which metal?

A. Magnesium (Correct Answer)
B. Calcium
C. Sodium
D. Potassium

Explanation: ***Magnesium*** - **Struvite stones** are primarily composed of **magnesium ammonium phosphate**, formed in the presence of urease-producing bacteria. - The presence of magnesium is a defining component of these **infection-related stones**. *Calcium* - **Calcium** is the primary component of the most common type of kidney stones, **calcium oxalate** and **calcium phosphate stones**. - These are typically unrelated to bacterial infections, unlike struvite stones. *Sodium* - **Sodium** is not a primary component of any common type of kidney stone. - While high sodium intake can increase the risk of stone formation, it does not directly form the stone matrix. *Potassium* - **Potassium** is not a characteristic component of kidney stones. - It plays a role in urinary pH regulation but is not directly incorporated into stone formation.

Question 567: Which of the following is not a feature of Minimal change disease?

A. Edema
B. Hypertension (Correct Answer)
C. Responsive to steroid therapy
D. Proteinuria

Explanation: ***Hypertension*** - Hypertension is not typically associated with **Minimal Change Disease** (MCD), as it primarily presents with nephrotic syndrome features [1]. - MCD is characterized by **normal blood pressure**, making this correct as it is not a feature of the disease [1]. *Proteinuria* - Proteinuria is a hallmark of **Minimal Change Disease**, often presenting as **nephrotic range proteinuria** [1]. - This condition involves significant loss of **albumin** in the urine, directly contradicting the option statement [1]. *Edema* - Edema is commonly seen in patients with **Minimal Change Disease**, primarily due to fluid retention from low serum albumin levels. - The **peripheral edema** often presents alongside other nephrotic syndrome features, thus making it a typical symptom. *Responsive to steroid therapy* - **Minimal Change Disease** is known for its excellent response to **steroids**, which is a key feature of this condition [1]. - Most patients show dramatic improvement with corticosteroid treatment, confirming this option is also incorrect [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 922-923.

Question 568: In a patient diagnosed with Autosomal Recessive Polycystic Kidney Disease (ARPKD), which protein is primarily altered due to mutations in the PKHD1 gene?

A. Polycystin
B. Nephrocystin
C. Uromodulin
D. Fibrocystin (Correct Answer)

Explanation: ***Fibrocystin*** - Autosomal recessive polycystic kidney disease (ARPKD) is primarily associated with the altered expression of **fibrocystin**, which is crucial for kidney development [1]. - Mutations in the *PKHD1* gene, responsible for fibrocystin, lead to the characteristic cyst formation in the kidneys [1]. *Polycystin* - Polycystin is related to autosomal dominant polycystic kidney disease (ADPKD), not ARPKD. - ADPKD is linked to mutations in the *PKD1* and *PKD2* genes, primarily affecting adult populations. *Uromodulin* - Uromodulin is predominantly expressed in the thick ascending limb of the loop of Henle and is linked to **medullary cystic kidney disease**, not ARPKD. - Its role is associated with urine concentration and is not directly involved in the pathogenesis of ARPKD. *Nephrocystin* - Nephrocystin is associated with nephronophthisis, which is a different cystic kidney disease. - It primarily impacts the ciliopathic pathways and kidney function, unlike fibrocystin's role in ARPKD. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 952-953.

Question 569: Histopathology showing large cells with plant-like appearance and a perinuclear halo is seen in which type of renal cell carcinoma?

A. Granular cell carcinoma
B. Chromophobic (Correct Answer)
C. Clear cell RCC
D. Papillary RCC

Explanation: ***Chromophobic*** - Characterized by **large cells** with a **plant-like appearance** and a **perinuclear halo**, consistent with chromophobic renal cell carcinoma [1]. - This type of carcinoma typically shows **foamy cytoplasm** due to the presence of abundant glycogen and lesser degree of nuclear atypia [1]. *Granular cell carcinoma* - This carcinoma features **eosinophilic** granular cytoplasm, not the **plant-like appearance** described in the question. - Granular cells are more often associated with **chromophobe cells**, but do not present with a perinuclear halo. *Angiosarcoma* - Angiosarcoma is characterized by **pleomorphic vascular formations** and does not display the **large cells** or halo appearance. - It typically shows a **high mitotic rate** and is associated with **vascular invasion**, distinguishing it from chromophobic carcinoma. *Onchocytoma* - Onchocytomas present with **large eosinophilic cells** due to mitochondrial proliferation and do not demonstrate the plant-like appearance or perinuclear halo [1]. - They usually do not have significant atypia or necrosis, unlike chromophobic renal cell carcinoma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 959.

Question 570: Which of the following statements about Renal Cell Carcinoma (RCC) is true?

A. Most common site is upper pole of kidney
B. Most common site of metastasis is liver
C. Most common variety is papillary type
D. Invasion of renal vein is more common than renal artery (Correct Answer)

Explanation: ***Invasion of renal vein is more common than renal artery*** - Renal cell carcinoma (RCC) is known for its tendency to invade the **renal vein** more frequently, leading to **thrombus formation** [1]. - This feature contributes to the risk of **venous metastasis**, which enhances its aggressive nature. *Most common site of metastasis is lymph nodes* - While RCC can metastasize to lymph nodes, the **most common sites** are actually the lungs and bones. - **Lymphatic spread** is less typical, as hematogenous spread is the preferred route for metastasis in RCC. *Most common site is lower lobe of kidney* - RCC can originate in any part of the kidney, with **upper pole involvement** being more common than the lower lobe. - It commonly presents as a mass rather than a site-specific condition within the kidney. *Most common variety is papillary type* - The most frequent subtype of RCC is **clear cell carcinoma** [1], not papillary, which accounts for approximately 70-80% of cases. - Papillary RCC is indeed a type but is **less prevalent**, making this statement incorrect. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 959-961.

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