Renal Pathology Practice Questions

Q: Necrotizing papillitis is seen in which of the following conditions?

Salicylate poisoning. **Explanation:** **Necrotizing Papillitis** (Renal Papillary Necrosis) is a condition characterized by ischemic necrosis of the renal papillae. It occurs due to a compromise in the blood supply of the vasa recta, which provides the primary nourishment to the renal medulla. **Why Salicylate Poisoning is Correct:** Salicylates (Aspirin) and other NSAIDs inhibit the synthesis of **Prostaglandins** (specifically PGE2) by inhibiting the cyclooxygenase (COX) enzyme. Prostaglandins are potent vasodilators of the afferent arterioles and the vasa recta. When their production is blocked, it leads to intense medullary vasoconstriction, resulting in ischemia and subsequent necrosis of the papillae. This is a hallmark of **Analgesic Nephropathy** [1]. **Analysis of Incorrect Options:** * **Glomerulonephritis:** This primarily affects the renal glomeruli through immunological mechanisms (e.g., immune complex deposition) rather than causing ischemic necrosis of the papillae [2]. * **Paroxysmal Nocturnal Hemoglobinuria (PNH):** While PNH can cause chronic kidney disease due to iron deposition (hemosiderosis) and microvascular thrombosis, it is not a classic or primary cause of necrotizing papillitis. * **Diabetes Insipidus:** This involves a deficiency of or resistance to ADH, leading to polyuria. It does not involve ischemic damage to the renal medulla. **High-Yield Clinical Pearls for NEET-PG:** To remember the common causes of Renal Papillary Necrosis, use the mnemonic **POSTCARDS**: * **P** - Pyelonephritis (Acute) * **O** - Obstruction of the urinary tract * **S** - **Sickle Cell Disease/Trait** (Most common cause in children) * **T** - Tuberculosis (Renal) * **C** - Cirrhosis * **A** - **Analgesic abuse/Salicylates** (Most common cause of chronic necrosis) * **R** - Renal vein thrombosis * **D** - **Diabetes Mellitus** (Most common overall cause) * **S** - Systemic Vasculitis

Q: Hereditary nephritis is seen in which of the following conditions?

Alport syndrome. **Explanation:** **Alport Syndrome (Correct Answer):** Alport syndrome is a classic example of **hereditary nephritis**. It is primarily an X-linked dominant disorder (85% of cases) caused by mutations in the **COL4A5 gene**, which encodes the α-5 chain of **Type IV collagen**. This collagen is a crucial structural component of the glomerular basement membrane (GBM), cochlea, and lens. Defective collagen leads to thinning and splitting of the GBM, clinically manifesting as the triad of **hereditary hematuria, sensorineural deafness, and ocular defects** (e.g., anterior lenticonus) [1]. **Analysis of Incorrect Options:** * **Analgesic Nephropathy:** An **acquired** chronic tubulointerstitial nephritis caused by the cumulative ingestion of large quantities of NSAIDs or phenacetin. It is characterized by renal papillary necrosis. * **Balkan Nephropathy:** An **acquired** environmental form of interstitial nephritis found in the Danube River basin. It is linked to the ingestion of **aristolochic acid** (from the plant *Aristolochia clematitis*) and carries a high risk of transitional cell carcinoma. * **Eosinophilic Nephritis:** Typically an **acquired** hypersensitivity reaction (Acute Interstitial Nephritis) often triggered by drugs like NSAIDs, antibiotics (penicillins), or diuretics. **High-Yield Clinical Pearls for NEET-PG:** * **Electron Microscopy (EM):** The hallmark of Alport syndrome is a **"Basket-weave appearance"** due to irregular thickening, thinning, and splitting of the lamina densa. * **Immunofluorescence:** Shows a characteristic **negative staining** for Type IV collagen chains [1]. * **Goodpasture Syndrome vs. Alport:** While both involve Type IV collagen, Goodpasture is an autoimmune attack against the α-3 chain, whereas Alport is a genetic deficiency. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 929-930.

Q: The most characteristic finding in diabetic nephropathy is:

Nodular glomerulosclerosis. **Explanation:** **Nodular glomerulosclerosis**, also known as **Kimmelstiel-Wilson (KW) lesions**, is considered the most characteristic (pathognomonic) histological finding in diabetic nephropathy [1]. These are ovoid, laminated, hyaline eosinophilic masses located in the periphery of the glomerulus, resulting from increased mesangial matrix production and basement membrane thickening. **Analysis of Options:** * **A. Diffuse glomerulosclerosis:** This is actually the **most common** lesion in diabetic nephropathy [1]. It involves a generalized increase in mesangial matrix. While frequent, it is not as specific (characteristic) as the nodular form. * **C. Armanni-Ebstein reaction:** This refers to vacuolation and glycogen deposits in the epithelial cells of the **proximal convoluted tubules** (pars recta). While seen in diabetes, it is a tubular change, not a glomerular one, and is less common today due to better glycemic control. * **D. Fibrin caps:** These are hyaline accumulations on the surface of glomerular capillaries. Along with **Capsular drops**, they are features of diabetic nephropathy but are non-specific as they can occur in other glomerular diseases. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Clinical Sign:** Microalbuminuria (30-300 mg/day). * **Earliest Morphological Change:** Thickening of the Glomerular Basement Membrane (GBM) [2]. * **Pathogenesis:** Non-enzymatic glycosylation of proteins leading to Advanced Glycation End-products (AGEs). * **Vascular Change:** Hyaline arteriolosclerosis affecting **both** afferent and efferent arterioles (highly suggestive of diabetes). * **Kimmelstiel-Wilson nodules** are PAS-positive [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.

Question 1

Necrotizing papillitis is seen in which of the following conditions?

Accepted Answer

Salicylate poisoning

Answer

Glomerulonephritis

Answer

Paroxysmal nocturnal hemoglobinuria (PNH)

Answer

Diabetes insipidus

Question 2

Mesangial deposits of monoclonal Kappa/Lambda light chains are indicative of which condition?

Accepted Answer

Amyloidosis

Answer

Mesangioproliferative glomerulonephritis

Answer

Focal and segmental glomerulosclerosis

Answer

Kimmelstiel-Wilson disease

Question 3

What is the most widely accepted mechanism associated with nephropathy in chronic HBV patients?

Accepted Answer

Deposition of immune complex particles attributed to viral antigens and host antibodies

Answer

Cytopathic collisions induced by cellular virus infection

Answer

Virus-induced specific immunological mechanisms damaging the kidney

Answer

Indirect adverse effects of virus-induced cytokines or mediators in renal tissue.

Question 4

A pathologist examines a renal biopsy from a 45-year-old man with nephrotic syndrome and requests a Congo red stain to confirm the nature of amorphous acidophilic extracellular hyaline substances localized within the mesangial matrix of the glomeruli. A positive test confirms the presence of?

Accepted Answer

Amyloid

Answer

Alpha 1-antitrypsin

Answer

Copper

Answer

Glycogen

Question 5

All of the following are true statements about membranous nephropathy except?

Accepted Answer

Granular subendothelial IgG accompanied by C3 deposits

Answer

Irregular 'spikes' on silver staining

Answer

Selective proteinuria

Answer

SLE is a secondary cause

Question 6

Increased renin activity is seen in all of the following conditions, except:

Accepted Answer

Benign nephrosclerosis

Answer

Malignant nephrosclerosis

Answer

Hemolytic Uremic Syndrome

Answer

Juxtaglomerular cell tumor

Question 7

According to WHO classification, which class of membranous glomerulonephritis is typically seen in Systemic Lupus Erythematosus (SLE)?

Accepted Answer

Class V

Answer

Class II

Answer

Class III

Answer

Class IV

Question 8

Hereditary nephritis is seen in which of the following conditions?

Accepted Answer

Alport syndrome

Answer

Analgesic nephropathy

Answer

Balkan nephropathy

Answer

Eosinophilic nephritis

Question 9

You are examining a nephrectomy specimen diagnosed as renal cell carcinoma. On microscopic examination, the tumor cells contain glycogen and lipids. What is the most likely diagnosis?

Accepted Answer

Clear cell carcinoma

Answer

Papillary carcinoma

Answer

Chromophobe renal carcinoma

Answer

Collecting duct carcinoma

Question 10

The most characteristic finding in diabetic nephropathy is:

Accepted Answer

Nodular glomerulosclerosis

Answer

Diffuse glomerulosclerosis

Answer

Armanni-Ebstein reaction

Answer

Fibrin caps

Renal Pathology — MCQs

Renal Pathology — MCQs

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