Renal Pathology Practice Questions

Q: A 28-year-old man presents with a 2-day history of hemoptysis and hematuria. His vital signs are: temperature 36.8°C, pulse 87/min, respirations 19/min, and blood pressure 150/90 mm Hg. Laboratory findings include creatinine 3.8 mg/dL and urea nitrogen 35 mg/dL. Urinalysis reveals 4+ hematuria, 2+ proteinuria, and no glucose. A renal biopsy shows glomerular damage with linear immunofluorescence for C3 and anti-IgG antibody. Which of the following autoantibodies has the greatest specificity for this patient's condition?

Anti-basement membrane antibody. ### Explanation The patient presents with the classic triad of **Goodpasture Syndrome**: hemoptysis (pulmonary hemorrhage), hematuria (rapidly progressive glomerulonephritis), and acute renal failure (elevated creatinine) [1]. **1. Why the Correct Answer is Right:** The definitive diagnostic finding in this case is the **linear immunofluorescence** for IgG and C3 [1]. This pattern is pathognomonic for **Type II Hypersensitivity**, where autoantibodies are directed against the **α3 chain of Type IV collagen** found in the glomerular and alveolar basement membranes [1]. Therefore, **Anti-basement membrane (Anti-GBM) antibodies** are highly specific for this condition. **2. Why the Other Options are Wrong:** * **Anticardiolipin antibody:** Associated with Antiphospholipid Syndrome (APS), characterized by arterial/venous thrombosis and pregnancy loss, not linear glomerular deposits. * **Anti-double-stranded DNA (dsDNA) antibody:** Highly specific for Systemic Lupus Erythematosus (SLE). While SLE can cause nephritis, it typically shows a "lumpy-bumpy" (granular) immunofluorescence pattern due to immune complex deposition (Type III Hypersensitivity) [1]. * **Anti-histone antibody:** Primarily associated with Drug-Induced Lupus. **3. NEET-PG High-Yield Pearls:** * **Immunofluorescence Pattern:** Linear = Goodpasture Syndrome (Anti-GBM); Granular = Post-streptococcal GN or SLE; Pauci-immune = ANCA-associated vasculitis (Wegener’s) [1]. * **Morphology:** On light microscopy, Goodpasture Syndrome often presents as **Crescentic Glomerulonephritis** (RPGN Type I) [1]. * **Treatment:** Urgent plasmapheresis is required to remove the circulating anti-GBM antibodies, combined with corticosteroids and cyclophosphamide [1]. **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. 526-538.

Q: Kimmelstiel Wilson disease is characterized by which of the following findings?

Nodular glomerulosclerosis. **Explanation:** **Kimmelstiel-Wilson (KW) disease** is the pathognomonic lesion of **Diabetic Nephropathy**. It is characterized by **Nodular Glomerulosclerosis**, which involves the formation of ovoid or spherical, laminated, hyaline masses situated in the periphery of the glomerulus [1]. These nodules are PAS-positive and represent an accumulation of mesangial matrix [1]. **Analysis of Options:** * **Option C (Correct):** Nodular glomerulosclerosis is the hallmark of KW disease [1]. While it occurs in only 15-30% of diabetic patients, it is highly specific for diabetes mellitus. * **Option A:** Diffuse glomerulosclerosis is actually the *most common* lesion in diabetic nephropathy, characterized by a generalized increase in mesangial matrix [1]. However, the specific term "Kimmelstiel-Wilson disease" refers strictly to the nodular form. * **Option B:** Capillary basement membrane thickening is the *earliest* morphological change seen in diabetic nephropathy (detected via electron microscopy) [2], but it does not define KW disease. * **Option D:** This is a distractor. The matrix increase occurs in the **mesangium** of the kidney, not the "meninges" (which relate to the brain). **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic finding:** KW nodules (Nodular Glomerulosclerosis) [1]. * **Stain:** PAS (Periodic Acid-Schiff) positive [1]. * **Earliest Clinical Sign:** Microalbuminuria (30-300 mg/day). * **Associated finding:** Fibrin caps and Capsular drops are also seen in diabetic kidneys. * **Armanni-Ebstein Lesions:** Vacuolation of proximal tubular epithelial cells due to glycogen deposits (seen in uncontrolled diabetes). **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.

Q: Which gene mutation is associated with X-linked Alport Syndrome?

COL4A5. **Explanation:** Alport Syndrome is a hereditary nephritis caused by mutations in the genes encoding the **Type IV collagen** chains, which are essential components of the glomerular basement membrane (GBM), cochlea, and lens. **1. Why COL4A5 is correct:** Approximately **80% of Alport Syndrome cases are X-linked dominant**, resulting from a mutation in the **COL4A5** gene located on the X chromosome. This gene encodes the **α5 chain** of Type IV collagen. The lack of functional α5 chains prevents the normal assembly of the α3-α4-α5 collagen network, leading to a defective, thinning, and eventually splitting GBM [1]. **2. Why the other options are incorrect:** * **COL4A3 and COL4A4 (Options B & C):** Mutations in these genes (encoding α3 and α4 chains) are associated with **Autosomal Recessive** or **Autosomal Dominant** forms of Alport Syndrome. While they produce a similar clinical phenotype, they do not follow the X-linked inheritance pattern. * **COL4A1 (Option A):** Mutations in this gene are associated with hereditary angiopathy, nephropathy, aneurysms, and muscle cramps (HANAC) syndrome, but not classic Alport Syndrome. **3. High-Yield Clinical Pearls for NEET-PG:** * **Clinical Triad:** Hereditary nephritis (hematuria/ESRD), Sensorineural deafness, and Ocular defects (e.g., **Anterior Lenticonus**). * **Electron Microscopy (Gold Standard):** Characterized by a "Basket-weave appearance" due to irregular thinning and thickening with splitting of the lamina densa. * **Immunofluorescence:** Shows a characteristic loss of staining for α3, α4, and α5 collagen chains in the GBM [1]. * **Differential Diagnosis:** Thin Basement Membrane Lesion (Benign Familial Hematuria) also involves COL4A3/COL4A4 but presents with isolated hematuria without systemic involvement [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 929-930.

Question 1

Which of the following is NOT a characteristic of IgA nephropathy?

Accepted Answer

Thin basement membrane on renal biopsy

Answer

Hematuria

Answer

Hypertension

Answer

Nephritic syndrome

Question 2

Which of the following is NOT a documented pattern of glomerular injury in HBV-related chronic liver disease?

Accepted Answer

C3 glomerulopathy

Answer

Minimal change nephropathy

Answer

Mesangial proliferative glomerulonephritis

Answer

Membranoproliferative glomerulonephritis

Question 3

All of the following are true regarding minimal change glomerulonephritis except?

Accepted Answer

Poor response to steroids

Answer

Normal glomerulus on light microscopy

Answer

More common in children than adults

Answer

Absence of podocytes on electron microscopy

Question 4

In acute interstitial nephritis, which proteins are characteristically associated with the interstitial infiltrate?

Accepted Answer

Amyloid

Answer

Fibrinogen

Answer

Vitamin D binding protein

Answer

Albumin

Question 5

A 28-year-old man presents with a 2-day history of hemoptysis and hematuria. His vital signs are: temperature 36.8°C, pulse 87/min, respirations 19/min, and blood pressure 150/90 mm Hg. Laboratory findings include creatinine 3.8 mg/dL and urea nitrogen 35 mg/dL. Urinalysis reveals 4+ hematuria, 2+ proteinuria, and no glucose. A renal biopsy shows glomerular damage with linear immunofluorescence for C3 and anti-IgG antibody. Which of the following autoantibodies has the greatest specificity for this patient's condition?

Accepted Answer

Anti-basement membrane antibody

Answer

Anticardiolipin antibody

Answer

Anti-double-stranded DNA antibody

Answer

Anti-histone antibody

Question 6

Kimmelstiel Wilson disease is characterized by which of the following findings?

Accepted Answer

Nodular glomerulosclerosis

Answer

Diffuse glomerulosclerosis

Answer

Capillary basement membrane thickening

Answer

Increase in meningeal matrix

Question 7

A 4-year-old girl presents with swelling of the legs and ankles. Physical examination reveals pitting edema of the lower extremities. Urinalysis shows 2+ proteinuria. The urinary sediment contains no inflammatory cells or red blood cells. Serum levels of BUN and creatinine are normal. The patient recovers completely after a course of corticosteroids. Electron microscopy of a renal biopsy specimen prior to treatment would most likely demonstrate which of the following abnormalities?

Accepted Answer

Fusion of podocyte foot processes

Answer

Duplication of capillary basement membranes

Answer

Electron-dense immune deposits in the capillary basement membranes

Answer

Electron-dense immune deposits in the mesangium

Question 8

Which gene mutation is associated with X-linked Alport Syndrome?

Accepted Answer

COL4A5

Answer

COL4A1

Answer

COL4A3

Answer

COL4A4

Question 9

What is true about post-streptococcal glomerulonephritis?

Accepted Answer

Diffuse involvement

Answer

Linear deposition

Answer

Tram track appearance

Answer

Global sclerosis

Question 10

Renal vein thrombosis is associated with which underlying disease of the kidney?

Accepted Answer

Nephrotic syndrome

Answer

Chronic glomerulonephritis

Answer

Pyelonephritis

Answer

Systemic Lupus Erythematosus (SLE)

Renal Pathology — MCQs

Renal Pathology — MCQs

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