Renal Pathology Practice Questions

Q: RBC casts in the microscopic examination of urine are an indicator of which of the following conditions?

Acute glomerulonephritis. **Explanation:** **1. Why Acute Glomerulonephritis is Correct:** The presence of **RBC casts** is a pathognomonic finding for **glomerular hematuria**, most commonly seen in **Acute Glomerulonephritis (AGN)** [1]. When there is inflammation or damage to the glomerular basement membrane, red blood cells leak into the nephron [1]. As they pass through the distal convoluted tubule and collecting duct, they are trapped within a matrix of **Tamm-Horsfall mucoprotein**. The cylindrical shape of the tubule molds these cells into "casts." Their presence confirms that the source of bleeding is the renal parenchyma (specifically the glomerulus) rather than the lower urinary tract [1]. **2. Why the Other Options are Incorrect:** * **Acute Pyelonephritis:** This is characterized by **WBC casts** and bacteria in the urine, reflecting an infectious/inflammatory process in the renal pelvis and interstitium. * **Chronic Glomerulonephritis:** While hematuria can occur, the characteristic finding in chronic renal failure or advanced stages is **Broad, Waxy casts**, which indicate dilated, atrophic tubules with low flow. * **Nephrotic Syndrome:** This is primarily characterized by heavy proteinuria [1]. The classic microscopic findings are **Fatty casts**, "Maltese cross" appearance under polarized light, and oval fat bodies. **3. NEET-PG High-Yield Clinical Pearls:** * **RBC Casts:** Glomerulonephritis (e.g., Post-streptococcal GN) or Vasculitis [1]. * **WBC Casts:** Pyelonephritis or Acute Interstitial Nephritis. * **Eosinophil Casts:** Highly suggestive of Drug-induced Acute Interstitial Nephritis. * **Muddy Brown (Granular) Casts:** Diagnostic of Acute Tubular Necrosis (ATN). * **Hyaline Casts:** Can be normal (seen in dehydration or after intense exercise).

Q: RBC casts in the microscopic examination of urine are an indicator of which of the following conditions?

Acute glomerulonephritis. ### Explanation **1. Why Acute Glomerulonephritis (AGN) is Correct:** RBC casts are the hallmark of **glomerular bleeding** [3]. In AGN, the glomerular filtration barrier is damaged (due to inflammation), allowing Red Blood Cells (RBCs) to leak into the nephron [3]. As these cells pass through the distal convoluted tubule and collecting duct, they are trapped within a matrix of **Tamm-Horsfall protein** (uromodulin). The cylindrical shape of the tubule molds them into "casts." Their presence definitively localizes the source of hematuria to the renal parenchyma (specifically the glomeruli) rather than the lower urinary tract [1]. **2. Why the Other Options are Incorrect:** * **B. Acute Pyelonephritis:** This is an upper urinary tract infection characterized by **WBC casts** (leukocyte casts) and bacteria, indicating tubulointerstitial inflammation. * **C. Chronic Glomerulonephritis:** While RBCs may be seen, the characteristic finding in chronic renal failure is **Broad, Waxy casts**, which result from the compensatory dilation of remaining functional nephrons. * **D. Nephrotic Syndrome:** This is characterized by massive proteinuria [3]. The classic microscopic findings are **Fatty casts**, "Maltese cross" appearance under polarized light, and oval fat bodies. **3. NEET-PG High-Yield Pearls:** * **RBC Casts:** Pathognomonic for Glomerulonephritis (e.g., PSGN, IgA Nephropathy, RPGN) [3]. * **WBC Casts:** Pathognomonic for Pyelonephritis or Acute Interstitial Nephritis (AIN). * **Eosinophiluria:** Highly suggestive of Drug-induced AIN [4]. * **Muddy Brown (Granular) Casts:** Pathognomonic for Acute Tubular Necrosis (ATN). * **Hyaline Casts:** Can be normal (seen in dehydration or after intense exercise). * **Dysmorphic RBCs (Acanthocytes):** Like RBC casts, these indicate a glomerular origin of hematuria [2].

Question 1

RBC casts in the microscopic examination of urine are an indicator of which of the following conditions?

Accepted Answer

Acute glomerulonephritis

Answer

Acute pyelonephritis

Answer

Chronic glomerulonephritis

Answer

Nephrotic syndrome

Question 2

Which one of the following variants of renal cell carcinoma has the worst prognosis?

Accepted Answer

Sarcomatoid

Answer

Papillary

Answer

Tubuloalveolar

Answer

Chromophobe

Question 3

Renal calculi are commonly made up of which substance?

Accepted Answer

Calcium oxalate

Answer

Magnesium ammonium phosphate

Answer

Uric acid

Answer

Cystine

Question 4

RBC casts in the microscopic examination of urine are an indicator of which of the following conditions?

Accepted Answer

Acute glomerulonephritis

Answer

Acute pyelonephritis

Answer

Chronic glomerulonephritis

Answer

Nephrotic syndrome

Question 5

The prognosis is best in rapidly progressive (crescentic) glomerulonephritis associated with which of the following conditions?

Accepted Answer

Poststreptococcal glomerulonephritis

Answer

Systemic lupus erythematosus (SLE)

Answer

Henoch-Schoenlein purpura

Answer

Polyarteritis nodosa

Question 6

Post-streptococcal glomerulonephritis (PSGN) is associated with which of the following findings?

Accepted Answer

Subepithelial immune deposits

Answer

Acute renal failure with nephritis

Answer

Low complement levels

Answer

Hypertension and proteinuria

Question 7

A patient presents with hematuria of several days and dysmorphic RBC casts in urine. What is the most likely site of origin for these findings?

Accepted Answer

Kidney

Answer

Ureter

Answer

Bladder

Answer

Urethra

Question 8

A young child presented with a history of dark-colored urine and reduced urine output. The child had a past history of abdominal pain, fever, and bloody diarrhea for 4 days, which resolved spontaneously. There was no peripheral edema or rashes. Investigations revealed anemia, thrombocytopenia, and elevated blood urea nitrogen and serum creatinine. Which of the following findings is most expected in this patient?

Accepted Answer

Elevated serum indirect bilirubin

Answer

Elevated haptoglobin level

Answer

Elevated thrombin and prothrombin time

Answer

Low fibrinogen and elevated D-dimer level

Question 9

A wire loop lesion seen in lupus nephritis is due to which of the following?

Accepted Answer

Capillary wall thickening

Answer

Basement membrane thickening

Answer

Subepithelial deposits

Answer

Sclerosis of mesangium

Question 10

Hypercalcemia is a known complication in which type of cancer?

Accepted Answer

Renal cell carcinoma

Answer

Carcinoma of the stomach

Answer

Small cell carcinoma of the lung

Answer

Hepatocellular carcinoma

Renal Pathology — MCQs

Renal Pathology — MCQs

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