Renal Pathology — MCQs

Renal Pathology Indian Medical PG Practice Questions and MCQs

Question 311: Which of the following is called Dense deposit disease?

A. Rapidly progressive glomerulonephritis - Type I
B. Membranoproliferative glomerulonephritis - Type II (Correct Answer)
C. Rapidly progressive glomerulonephritis - Type II
D. Membranoproliferative glomerulonephritis - Type I

Explanation: **Explanation:** **Membranoproliferative Glomerulonephritis (MPGN) Type II** is specifically known as **Dense Deposit Disease (DDD)** [1]. The name is derived from its characteristic appearance on Electron Microscopy (EM), where highly electron-dense, ribbon-like material is deposited within the **lamina densa** of the glomerular basement membrane (GBM) [1]. **Why Option B is correct:** DDD is primarily a disease of **alternative complement pathway dysregulation** [2]. It is strongly associated with **C3 Nephritic Factor (C3NeF)**, an autoantibody that stabilizes C3 convertase, leading to continuous C3 consumption and low serum C3 levels [2]. Unlike MPGN Type I, it is characterized by the absence of classic immune complexes [1]. **Why other options are incorrect:** * **MPGN Type I (Option D):** Characterized by subendothelial deposits and a "tram-track" appearance due to mesangial interposition [3]. It involves the classical complement pathway [3]. * **RPGN Type I (Option A):** Also known as Anti-GBM disease (e.g., Goodpasture syndrome), characterized by linear IgG deposits. * **RPGN Type II (Option C):** An immune-complex mediated crescentic glomerulonephritis (e.g., seen in SLE or Post-streptococcal GN) showing a granular pattern on immunofluorescence. **High-Yield Clinical Pearls for NEET-PG:** * **Electron Microscopy:** "Ribbon-like" dense deposits in the GBM is the pathognomonic finding [1]. * **Immunofluorescence:** Shows "starry sky" or "ring-like" C3 staining; notably, **IgG is usually absent** [2]. * **Association:** Often associated with **Partial Lipodystrophy**. * **Prognosis:** High recurrence rate in renal transplants. * **Complement:** Low C3, but normal C1 and C4 (selective alternative pathway activation) [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 926-927. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 534-535. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 925-926.

Question 312: Which renal cell carcinoma subtype characteristically shows a perinuclear halo and plant-like intracytoplasmic inclusions in malignant cells?

A. Clear cell carcinoma
B. Papillary carcinoma
C. Collecting duct carcinoma
D. None of the above (Correct Answer)

Explanation: **Explanation:** The correct answer is **None of the above** because the description provided—**perinuclear halos** and **plant-like cell membranes** (often described as "vegetable-like")—is the classic histological hallmark of **Chromophobe Renal Cell Carcinoma (RCC)**, which is not listed among the options. **1. Why the correct answer is "None of the above":** Chromophobe RCC arises from the intercalated cells of the collecting ducts [1]. Microscopically, it features large, polygonal cells with prominent, rigid cell membranes (plant-like) and a characteristic clear zone around the nucleus (perinuclear halo) [1]. These cells also contain numerous microvesicles, which stain positive with **Hale’s Colloidal Iron**. **2. Why other options are incorrect:** * **Clear cell carcinoma:** This is the most common subtype. It shows cells with clear cytoplasm (due to lipid and glycogen) and a delicate "chicken-wire" vascular pattern, but lacks the distinct perinuclear halos and rigid membranes of Chromophobe RCC [1]. * **Papillary carcinoma:** Characterized by malignant cells arranged in finger-like projections (papillae) with fibrovascular cores often containing **Psammoma bodies** and foamy macrophages. * **Collecting duct carcinoma:** A rare, highly aggressive tumor arising from the Medulla. It typically shows a hobnail pattern and significant desmoplasia, rather than plant-like cells. **NEET-PG High-Yield Pearls:** * **Chromophobe RCC** has the **best prognosis** among the common RCC subtypes [1]. * **Cytogenetics:** Chromophobe RCC is associated with **extreme hypodiploidy** (loss of multiple chromosomes: 1, 2, 6, 10, 13, 17, 21) [1]. * **Staining:** Hale’s Colloidal Iron is the specific stain for Chromophobe RCC (diffuse cytoplasmic positivity). * **Differential:** It can be difficult to distinguish from Oncocytoma; however, Chromophobe RCC lacks the "central stellate scar" typically seen in Oncocytoma [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 959.

Question 313: Which is a characteristic finding in Acute Glomerulonephritis (AGN)?

A. Red blood cell cast (Correct Answer)
B. Hematuria
C. Proteinuria
D. Epithelial cells

Explanation: **Explanation** Acute Glomerulonephritis (AGN) is a clinical syndrome characterized by the sudden onset of hematuria, edema, hypertension, and oliguria [1]. **Why Red Blood Cell (RBC) Casts are the Correct Answer:** The presence of **Red Blood Cell (RBC) casts** is the hallmark of glomerular bleeding. When RBCs pass through a damaged glomerular basement membrane into the renal tubules, they are trapped within a matrix of Tamm-Horsfall protein. The formation of these "casts" proves that the source of bleeding is the **renal parenchyma (glomerulus)** rather than the lower urinary tract (ureters or bladder). In the context of a patient with nephritic features, RBC casts are considered **pathognomonic** for glomerulonephritis [1]. **Analysis of Incorrect Options:** * **B. Hematuria:** While hematuria is a cardinal feature of AGN, it is a **non-specific** finding. It can occur in stones, infections, or malignancies of the entire urinary tract. RBC casts are more "characteristic" because they localize the pathology specifically to the glomerulus. * **C. Proteinuria:** Proteinuria occurs in AGN (usually <3.5g/day, sub-nephrotic range), but it is also seen in nephrotic syndrome, diabetes, and tubular diseases. It lacks the diagnostic specificity of RBC casts for AGN. * **D. Epithelial cells:** These are commonly found in the urine due to normal shedding or in cases of Acute Tubular Necrosis (ATN). They are not a defining characteristic of AGN. **NEET-PG High-Yield Pearls:** * **Dysmorphic RBCs:** On phase-contrast microscopy, "Acanthocytes" (Mickey Mouse-shaped RBCs) are highly suggestive of glomerular origin. * **Most Common Cause:** Post-Streptococcal Glomerulonephritis (PSGN) is the classic prototype of AGN [1]. * **Lumpy-Bumpy Appearance:** Immunofluorescence in PSGN shows granular deposits of IgG and C3 [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 915-916.

Question 314: Polycystic kidney disease is associated with cysts in which of the following organs, except?

A. Lung
B. Liver
C. Pancreas
D. Brain (Correct Answer)

Explanation: **Explanation:** The question focuses on the extrarenal manifestations of **Autosomal Dominant Polycystic Kidney Disease (ADPKD)**. While ADPKD primarily affects the kidneys, it is a systemic disorder characterized by epithelial cysts in various organs and vascular abnormalities [1]. **Why Brain is the correct answer:** Cysts do **not** typically form in the brain parenchyma in ADPKD. Instead, the most significant neurological association is **Berry Aneurysms** (found in the Circle of Willis), which occur in approximately 5-10% of patients. While these are vascular dilatations, they are not "cysts." Therefore, the brain is the exception in this list. **Analysis of other options:** * **Liver (Option B):** This is the **most common** extrarenal site for cysts. Polycystic liver disease occurs in about 70% of ADPKD patients but rarely leads to hepatic failure [2]. * **Pancreas (Option C):** Pancreatic cysts are a well-recognized extrarenal manifestation, occurring in approximately 5-10% of cases [1]. * **Lung (Option A):** Though less common than liver cysts, pulmonary cysts and bronchiectasis are documented associations with ADPKD. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Most cases (85%) are due to a mutation in the **PKD1 gene** (Chromosome 16), which encodes Polycystin-1 [1]. The remaining 15% are due to **PKD2** (Chromosome 4). * **Cardiac Associations:** Mitral Valve Prolapse (MVP) is the most common valvular abnormality. * **Other Extrarenal Sites:** Spleen, seminal vesicles (can cause infertility), and diverticula of the colon. * **Cause of Death:** The most common cause of death in ADPKD is **cardiovascular disease**, followed by renal failure and ruptured berry aneurysms (subarachnoid hemorrhage). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 950-951. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 952-953.

Question 315: What is the most common pathological finding in diabetic nephropathy?

A. Diffuse Glomerulonephritis (Correct Answer)
B. Diffuse cortical sclerosis
C. Nodular glomerulosclerosis
D. Renal atherosclerosis

Explanation: **Explanation:** In the context of diabetic nephropathy, it is crucial to distinguish between the **most common** finding and the **most specific** finding. **1. Why Diffuse Glomerulosclerosis (Diffuse Glomerulonephritis) is correct:** Diffuse glomerulosclerosis is the **most common** pathological lesion in diabetic nephropathy [1]. It is characterized by a generalized increase in mesangial matrix and thickening of the glomerular basement membrane (GBM). Almost all patients with long-standing diabetes (both Type 1 and Type 2) develop this change, even if they are asymptomatic [1]. **2. Analysis of Incorrect Options:** * **Nodular Glomerulosclerosis (Kimmelstiel-Wilson lesions):** While this is the **most specific** (pathognomonic) finding for diabetes, it occurs in only 15-30% of patients. It appears as ovoid, laminated hyaline masses in the periphery of the glomerulus. * **Diffuse Cortical Sclerosis:** This is a non-specific end-stage finding seen in various chronic renal diseases and is not the primary or most common feature of diabetes. * **Renal Atherosclerosis:** Diabetes accelerates atherosclerosis in large and medium-sized arteries, but this is a vascular complication rather than the primary glomerular pathology defining diabetic nephropathy. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Change:** Thickening of the Glomerular Basement Membrane (GBM) [1]. * **Earliest Clinical Sign:** Microalbuminuria (30-300 mg/day). * **Pathognomonic Lesion:** Kimmelstiel-Wilson (KW) nodules. * **Vascular Hallmark:** Hyaline arteriolosclerosis affecting **both** afferent and efferent arterioles (highly suggestive of diabetes). * **Armanni-Ebstein Lesions:** Glycogen deposits in the tubular epithelial cells (Distal Convoluted Tubule). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1119-1121.

Question 316: Nephritic syndrome is characterized by all of the following except?

A. Hematuria
B. Edema
C. Hypertension
D. Massive proteinuria (Correct Answer)

Explanation: **Explanation:** The core distinction in glomerular diseases lies between **Nephritic Syndrome** and **Nephrotic Syndrome** [3]. **Massive proteinuria** (Option D) is the hallmark of **Nephrotic Syndrome**, defined as protein excretion >3.5 g/24 hours [3], [4]. In contrast, Nephritic Syndrome is characterized by an inflammatory process that breaches the glomerular filtration barrier, leading to the leakage of red blood cells and a moderate amount of protein (usually <3.5 g/day) [1], [3]. Therefore, "Massive Proteinuria" is the incorrect feature for Nephritic syndrome. **Analysis of other options:** * **Hematuria (Option A):** This is the cardinal feature of Nephritic syndrome [3]. Inflammation causes capillary wall damage, leading to RBCs in the urine, often presenting as "smoky" or "cola-colored" urine with RBC casts. * **Edema (Option B):** In Nephritic syndrome, edema occurs primarily due to salt and water retention (decreased GFR), whereas in Nephrotic syndrome, it is due to low oncotic pressure from hypoalbuminemia. * **Hypertension (Option C):** This results from fluid overload and increased renin secretion due to reduced renal perfusion [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Nephritic Syndrome Triad:** Hematuria, Hypertension, and Oliguria [3]. * **Classic Example:** Post-Streptococcal Glomerulonephritis (PSGN) – look for "lumpy-bumpy" subepithelial humps on Electron Microscopy [2]. * **Nephrotic Syndrome Tetrad:** Massive proteinuria (>3.5g), Hypoalbuminemia (<3g/dL), Generalized Edema (Anasarca), and Hyperlipidemia/Lipiduria. * **Mnemonic:** Nephritic = **I**nflammation (**I** for **I**titis/Nephritic); Nephrotic = **P**rotein (**O** for Pr**o**tein). **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. 527-528. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 915. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 918-919. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 530-531.

Question 317: RBC casts are typically present in which of the following conditions?

A. Acute tubular nephritis
B. Acute glomerulonephritis (Correct Answer)
C. Acute pyelonephritis
D. Acute interstitial nephritis

Explanation: **Explanation:** **1. Why Acute Glomerulonephritis (AGN) is correct:** RBC casts are the hallmark of **glomerular bleeding** [1]. In AGN, the glomerular filtration barrier is damaged (due to inflammation), allowing Red Blood Cells to leak into the nephron [2]. As these cells pass through the distal convoluted tubule and collecting ducts, they are trapped within a matrix of **Tamm-Horsfall mucoprotein**. The presence of RBC casts specifically localizes the source of hematuria to the **renal parenchyma (glomerulus)** rather than the lower urinary tract [2]. **2. Why the other options are incorrect:** * **Acute Tubular Necrosis (ATN):** Characterized by **"Muddy brown" granular casts** or epithelial cell casts due to the sloughing of necrotic tubular cells. * **Acute Pyelonephritis:** Characterized by **WBC (Leukocyte) casts**, indicating an upper urinary tract infection/inflammation. * **Acute Interstitial Nephritis (AIN):** Typically presents with **WBC casts** and **eosinophiluria** (often drug-induced), reflecting inflammation of the renal interstitium. **3. High-Yield Clinical Pearls for NEET-PG:** * **RBC Casts = Nephritic Syndrome** (e.g., PSGN, IgA Nephropathy, RPGN) [1]. * **WBC Casts = Pyelonephritis or AIN** (helps differentiate upper UTI from cystitis). * **Fatty Casts ("Maltese Cross" appearance) = Nephrotic Syndrome.** * **Broad/Waxy Casts = Chronic Renal Failure** (due to dilated, stagnant tubules). * **Hyaline Casts** are non-specific and can be seen in normal concentrated urine, dehydration, or after vigorous exercise. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 230-232. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 915.

Question 318: Anti-GBM antibodies are seen in which condition?

A. Wegener's granulomatosis
B. Goodpasture syndrome (Correct Answer)
C. Polyarteritis nodosa
D. Systemic lupus erythematosus

Explanation: **Explanation:** **Goodpasture Syndrome (Option B)** is the correct answer because it is defined by the presence of circulating **Anti-Glomerular Basement Membrane (Anti-GBM) antibodies**. These antibodies are directed against the non-collagenous (NC1) domain of the **α3-chain of Type IV collagen** [1]. This leads to a Type II hypersensitivity reaction, characterized by **linear IgG deposits** along the basement membrane on immunofluorescence [1, 3]. Clinically, it presents as a combination of rapidly progressive glomerulonephritis (RPGN) and pulmonary hemorrhage (hemoptysis) [1]. **Why other options are incorrect:** * **Wegener’s Granulomatosis (GPA) (Option A):** This is a small-vessel vasculitis associated with **c-ANCA (PR3-ANCA)**. It shows a "pauci-immune" pattern on immunofluorescence (no significant antibody deposition). * **Polyarteritis Nodosa (PAN) (Option C):** This is a medium-vessel vasculitis typically associated with Hepatitis B. It characteristically **spares the lungs** and does not involve anti-GBM antibodies. * **Systemic Lupus Erythematosus (SLE) (Option D):** Lupus nephritis is caused by Type III hypersensitivity (immune complex deposition), showing a **"Full House" pattern** on immunofluorescence (IgG, IgA, IgM, C3, and C1q) rather than specific anti-GBM antibodies. **High-Yield Clinical Pearls for NEET-PG:** * **Immunofluorescence (IF):** The hallmark of Goodpasture is **Linear IgG** staining [1, 3]. * **Light Microscopy:** Often shows **Crescentic Glomerulonephritis** (RPGN Type I) [1]. * **Target Antigen:** α3 chain of Type IV collagen (Remember: "3" for α3 and "4" for Type IV). * **Treatment:** Plasmapheresis is the mainstay to remove the circulating antibodies [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. 526-527, 537-538. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 909.

Question 319: What is the most common type of carcinoma of the urinary bladder?

A. Squamous cell Carcinoma
B. Transitional cell Carcinoma (Correct Answer)
C. Adenocarcinoma
D. Mixed cell carcinoma

Explanation: **Explanation:** **Correct Answer: B. Transitional cell Carcinoma (Urothelial Carcinoma)** The urinary tract, from the renal pelvis to the proximal urethra, is lined by a specialized epithelium known as **urothelium** (formerly called transitional epithelium) [1]. Because this is the native lining of the bladder, **Transitional Cell Carcinoma (TCC)** is the most common histological type, accounting for over **90%** of all bladder cancers in developed countries. The primary risk factors include cigarette smoking and occupational exposure to aniline dyes (naphthylamine) [1]. **Analysis of Incorrect Options:** * **A. Squamous cell Carcinoma (SCC):** This accounts for only about 3–7% of bladder cancers in the West. However, it is the most common type in regions where **Schistosomiasis (*S. haematobium*)** is endemic, due to chronic irritation leading to squamous metaplasia [1]. * **C. Adenocarcinoma:** This is rare (approx. 1%) and usually arises from **urachal remnants** (typically at the bladder dome) or in the setting of cystitis glandularis or bladder exstrophy [3]. * **D. Mixed cell carcinoma:** While bladder tumors can show divergent differentiation (e.g., TCC with squamous features), they are categorized by their predominant component, and "mixed" is not the most common presentation [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Painless gross hematuria** is the most common presenting symptom of bladder cancer. * **Field Cancerization:** TCC is often multifocal because the entire urothelial lining is exposed to the same carcinogens [2]. * **Schistosoma haematobium** is a classic association for Squamous Cell Carcinoma, not TCC [1]. * **Gold Standard Diagnosis:** Cystoscopy with biopsy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 968-970. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 964-966. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 972-973.

Question 320: Nodular glomerulosclerosis is associated with which of the following conditions?

A. Henoch-Schonlein purpura
B. Hemolytic uremic syndrome
C. Hypertension
D. Diabetes Mellitus (Correct Answer)

Explanation: **Explanation:** **Nodular Glomerulosclerosis**, also known as **Kimmelstiel-Wilson (KW) lesions**, is the most specific histological hallmark of **Diabetic Nephropathy** [1]. These are ovoid or spherical, laminated, eosinophilic hyaline masses located in the periphery of the glomerulus within the mesangial matrix [2]. They result from non-enzymatic glycosylation of proteins and increased synthesis of mesangial matrix, eventually leading to the compression of glomerular capillaries and renal failure [1], [3]. **Analysis of Incorrect Options:** * **Henoch-Schonlein Purpura (A):** This is a systemic IgA vasculitis. Renal involvement typically presents as IgA nephropathy, characterized by mesangial IgA deposits and hypercellularity, not nodular sclerosis. * **Hemolytic Uremic Syndrome (B):** This is a form of Thrombotic Microangiopathy (TMA). It is characterized by endothelial injury, fibrin thrombi in glomerular capillaries, and a "double contour" appearance of the basement membrane. * **Hypertension (C):** Chronic hypertension leads to **Benign Nephrosclerosis**, characterized by hyaline arteriolosclerosis and *diffuse* (rather than nodular) glomerulosclerosis [4]. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Lesion in Diabetes:** Diffuse Glomerulosclerosis (though Nodular is the most *specific*) [2]. * **Armanni-Ebstein Lesions:** Vacuolation of proximal tubular epithelial cells due to glycogen deposits, also seen in Diabetes. * **Fibrillar Glomerulonephritis:** A rare condition that can mimic KW nodules but is identified by Congo-red negative, non-amyloid fibril deposits on electron microscopy. * **Capsular Drop and Fibrin Cap:** Other highly suggestive histological features of diabetic nephropathy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1121. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1121-1122. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 907-908. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 498-499.

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