Renal Pathology Practice Questions

Q: Which of the following is NOT a tubulointerstitial disease?

Lupus nephritis. The core of this question lies in distinguishing between **primary glomerular diseases** and **tubulointerstitial diseases**. **Why Lupus Nephritis is the correct answer:** Lupus Nephritis (associated with Systemic Lupus Erythematosus) is primarily a **glomerular disease**. It is characterized by the deposition of immune complexes within the glomeruli (subendothelial, subepithelial, or mesangial), leading to inflammation (glomerulonephritis). While chronic cases can eventually involve the interstitium, its fundamental classification and pathogenesis are glomerular. **Analysis of incorrect options (Tubulointerstitial Diseases):** * **Hypokalemic nephropathy:** Chronic potassium depletion leads to vacuolar degeneration of the proximal convoluted tubules and interstitial fibrosis, making it a metabolic tubulointerstitial disorder. * **Hypercalcemic nephropathy:** High calcium levels cause calcium deposition in the tubular basement membranes and interstitium (nephrocalcinosis), leading to tubular atrophy and interstitial scarring. * **Analgesic nephropathy:** This is a classic cause of chronic tubulointerstitial nephritis and papillary necrosis, typically resulting from long-term use of phenacetin or combinations of NSAIDs. **NEET-PG High-Yield Pearls:** * **Tubulointerstitial Nephritis (TIN):** Characterized by inflammatory infiltrate in the interstitium and tubular injury, sparing the glomeruli initially. * **Lupus Nephritis Classification:** Uses the ISN/RPS system (Classes I-VI). Class IV (Diffuse Proliferative) is the most common and severe form. * **Drug-induced Acute TIN:** Look for the triad of fever, rash, and eosinophilia (commonly caused by Methicillin, NSAIDs, or Sulfonamides). * **Metabolic causes of TIN:** Hypokalemia, Hypercalcemia, and Hyperuricemia.

Q: Eosinophiluria is typically seen in which of the following conditions?

Acute interstitial nephritis. **Explanation:** **Acute Interstitial Nephritis (AIN)** is the classic cause of **eosinophiluria**. AIN is most commonly a drug-induced hypersensitivity reaction (Type I or Type IV) to medications such as NSAIDs, penicillins, sulfonamides, and proton pump inhibitors [1, 2]. The underlying mechanism involves an immune-mediated infiltration of the renal interstitium by inflammatory cells, including T-lymphocytes and eosinophils [1]. These eosinophils eventually shed into the urine, making their presence a highly specific (though not always sensitive) diagnostic marker for AIN. **Why other options are incorrect:** * **Polyarteritis nodosa (PAN):** This is a systemic necrotizing vasculitis of medium-sized arteries. Crucially, PAN **spares the capillaries**, meaning it does not cause glomerulonephritis or significant urinary sediment changes like eosinophiluria. * **Microscopic polyangiitis (MPA):** While MPA involves small vessels and causes necrotizing glomerulonephritis, the urinary sediment typically shows red blood cell (RBC) casts and proteinuria (nephritic syndrome) rather than eosinophils. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of AIN:** Fever, Rash, and Arthralgia (seen in only ~10–30% of patients) [2]. * **Laboratory Findings:** Peripheral eosinophilia, elevated IgE, and eosinophiluria (detected via **Hansel’s stain** or Wright’s stain). * **Other causes of Eosinophiluria:** Atheroembolic renal disease (cholesterol crystals), rapidly progressive glomerulonephritis (RPGN), and prostatitis. * **Gold Standard Diagnosis:** Renal biopsy showing interstitial edema and inflammatory infiltrate [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 940-941. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 538-539.

Q: Alport syndrome is associated with a defect in which type of collagen?

Collagen type IV. **Explanation:** **Alport Syndrome** is a hereditary nephritis caused by mutations in the genes encoding the **Type IV collagen** chains (specifically α3, α4, or α5) [1]. Type IV collagen is a crucial structural component of the **basement membranes**, particularly in the glomeruli, cochlea, and lens of the eye [1]. The defect leads to thinning and splitting of the Glomerular Basement Membrane (GBM), classically described as a **"basket-weave appearance"** on electron microscopy. **Analysis of Options:** * **Option B (Correct):** Type IV collagen is the "Basement Membrane Collagen." Mutations (most commonly X-linked) lead to the clinical triad of progressive hematuria (renal failure), sensorineural hearing loss, and ocular defects (e.g., anterior lenticonus) [1]. * **Option A:** **Type I collagen** is found in bone, skin, and tendons. Defects here lead to **Osteogenesis Imperfecta**. * **Option C:** **Type III collagen** (Reticulin) is found in blood vessels and fetal skin. Defects are associated with the vascular type of **Ehlers-Danlos Syndrome**. * **Option D:** **Type VII collagen** forms anchoring fibrils. Defects lead to **Dystrophic Epidermolysis Bullosa**. **High-Yield Clinical Pearls for NEET-PG:** 1. **Inheritance:** Most common is **X-linked Dominant** (COL4A5 mutation) [1]. 2. **Electron Microscopy (EM):** The gold standard for diagnosis; shows irregular thickening, thinning, and **lamellation** (splitting) of the lamina densa. 3. **Ocular Sign:** **Anterior lenticonus** is pathognomonic for Alport Syndrome. 4. **Goodpasture Syndrome Connection:** Patients with Alport syndrome who receive a kidney transplant may develop anti-GBM antibodies against the "new" Type IV collagen, leading to post-transplant glomerulonephritis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 929-930.

Question 1

A 19-year-old woman presents with swelling of her eyelids, abdomen, and ankles. She has pitting edema in her legs where her socks elastic was. A chest X-ray reveals bilateral pleural effusions, and urine protein electrophoresis shows 4+ proteinuria. A percutaneous kidney biopsy confirms the diagnosis of minimal change nephrotic syndrome. What is the most likely mechanism of soft tissue edema in this patient?

Accepted Answer

Decreased intravascular oncotic pressure

Answer

Active hyperemia

Answer

Chronic passive congestion

Answer

Hyperalbuminemia

Question 2

An 8-year-old boy presents with headaches, dizziness, and malaise. He was seen for a severe sore throat 2 weeks ago. Physical examination reveals facial edema. The blood pressure is 180/110 mm Hg. A 24-hour urine collection demonstrates oliguria, and urinalysis shows hematuria. What finding on microscopic urinalysis indicates that hematuria in the patient is caused by a renal process, rather than bleeding from another site in the urinary tract?

Accepted Answer

Red blood cell casts

Answer

Blood clots

Answer

Hemoglobin crystals

Answer

Phagocytosed hemoglobin

Question 3

Which of the following is NOT a tubulointerstitial disease?

Accepted Answer

Lupus nephritis

Answer

Hypokalemic nephropathy

Answer

Hypercalcemic nephropathy

Answer

Analgesic nephropathy

Question 4

Which of the following is NOT seen in SLE nephropathy?

Accepted Answer

Lipoid nephrosis

Answer

Focal Glomerulonephritis

Answer

Diffuse Glomerulonephritis

Answer

Membranous Glomerulonephritis

Question 5

A 15-year-old male presents with hematuria. He has previous diagnoses of deafness and corneal dystrophy. Urinalysis shows 1+ protein, no ketones, no glucose, 1+ blood, and no leukocytes. A renal biopsy reveals tubular epithelial foam cells by light microscopy. By electron microscopy, the glomerular basement membrane shows areas of attenuation, with splitting and lamination of the lamina densa in other thickened areas. What is the most probable diagnosis?

Accepted Answer

Alport syndrome

Answer

Acute tubular necrosis

Answer

Berger's disease

Answer

Membranous glomerulonephritis

Question 6

Which carcinoma is most commonly associated with metastasis to the Inferior Vena Cava (IVC)?

Accepted Answer

Renal cell carcinoma

Answer

Small cell carcinoma of the lung

Answer

Gastric adenocarcinoma

Answer

Papillary carcinoma of the thyroid

Question 7

What is the most common cause of skeletal abnormality in a case of renal osteodystrophy?

Accepted Answer

Hyperphosphatemia

Answer

Impaired synthesis of Vitamin D3

Answer

Hypocalcemia

Answer

Hypercalcemia

Question 8

A 14-year-old boy develops nephrotic syndrome. A renal biopsy shows foot process fusion and no deposits on the membranes under electron microscopy. Which of the following is the most likely diagnosis?

Accepted Answer

Minimal change disease

Answer

Mesangial proliferative glomerulonephritis

Answer

Focal glomerulosclerosis

Answer

Membranous glomerulonephritis

Question 9

Eosinophiluria is typically seen in which of the following conditions?

Accepted Answer

Acute interstitial nephritis

Answer

Polyarteritis nodosa (PAN)

Answer

Microscopic polyangiitis

Answer

All of the above

Question 10

Alport syndrome is associated with a defect in which type of collagen?

Accepted Answer

Collagen type IV

Answer

Collagen type I

Answer

Collagen type III

Answer

Collagen type VII

Renal Pathology — MCQs

Renal Pathology — MCQs

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