Renal Pathology Practice Questions

Q: From which of the following does renal oncocytoma arise?

Collecting duct. ### Explanation **Correct Option: B. Collecting duct** Renal oncocytoma is a benign epithelial tumor that originates from the **intercalated cells of the collecting ducts**. These cells are rich in mitochondria, which gives the tumor its characteristic granular, eosinophilic cytoplasm on histopathology [1]. **Analysis of Incorrect Options:** * **A. Loop of Henle:** While various renal processes occur here, it is not the site of origin for common renal neoplasms. * **C. Proximal tubule:** This is the site of origin for **Renal Cell Carcinoma (RCC)**, specifically the **Clear Cell** and **Papillary** subtypes. This is a common distractor, as RCC is the most frequent primary renal malignancy. * **D. Bowman's capsule:** This structure is involved in filtration and is associated with crescent formation in glomerulonephritis, but not with the development of oncocytomas. **High-Yield Clinical Pearls for NEET-PG:** * **Gross Appearance:** Classically presents as a well-circumscribed, mahogany-brown tumor with a **central stellate scar**. * **Microscopy:** Composed of large cells (oncocytes) with abundant, granular, acidophilic cytoplasm. Electron microscopy reveals an **abundance of mitochondria**. * **Genetics:** Often associated with the loss of chromosomes 1 and Y. * **Differential Diagnosis:** It is difficult to distinguish from the **Chromophobe variant of RCC** (which also arises from collecting ducts) [1]. However, Chromophobe RCC typically shows "perinuclear halos" and stains positive with Hale’s Colloidal Iron, unlike oncocytoma. * **Prognosis:** Excellent, as it is a benign lesion [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 959.

Q: Which of the following statements is false regarding hypernephroma?

It produces osteosclerotic secondaries on flat bone. **Explanation:** Hypernephroma, also known as **Renal Cell Carcinoma (RCC)**, is the most common primary renal malignancy. **Why Option D is False (The Correct Answer):** RCC is notorious for causing **osteolytic** (bone-destroying) metastases, not osteosclerotic ones. These lesions are characteristically "blow-out" in appearance, highly vascular, and can present with pathological fractures. In contrast, osteosclerotic (bone-forming) metastases are typically associated with Prostate Cancer. **Analysis of Other Options:** * **Option A:** Occupational exposure to **leather tanning chemicals**, cadmium, petroleum products, and asbestos are established risk factors for RCC. * **Option B:** Histologically, the most common subtype (Clear Cell RCC) originates from the **proximal convoluted tubular epithelium**. * **Option C:** RCC is a "great imitator" and often presents with paraneoplastic syndromes. It can produce **Erythropoietin**, leading to polycythemia (elevated Hb levels). **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Hematuria (most common), loin pain, and a palpable mass (seen in only 10% of cases, usually advanced). * **Most Common Subtype:** Clear cell carcinoma (associated with VHL gene deletion on Chromosome 3p). * **Staging:** The most important prognostic factor is the stage at presentation. It has a unique propensity for **venous invasion** (renal vein and IVC). * **Paraneoplastic Syndromes:** Hypercalcemia (PTHrP), Hypertension (Renin), and Stauffer’s syndrome (reversible hepatic dysfunction without metastases). * **Treatment of Choice:** Radical nephrectomy (or partial nephrectomy for T1 tumors). It is generally resistant to chemotherapy and radiotherapy.

Q: What is the most common tumor of the urinary bladder?

Transitional cell carcinoma. **Explanation:** **Correct Answer: C. Transitional cell carcinoma (TCC)** The urinary bladder is lined by a specialized epithelium known as **urothelium** (transitional epithelium). Consequently, **Transitional Cell Carcinoma (TCC)**, now more commonly referred to as **Urothelial Carcinoma**, is the most common histological type, accounting for approximately **90-95%** of all bladder cancers in developed countries. The primary risk factors for TCC include cigarette smoking and occupational exposure to aromatic amines (e.g., aniline dyes). **Incorrect Options:** * **A & D. Squamous cell carcinoma (SCC):** While SCC is the second most common type (~3-7%), it only becomes the most common in specific geographical regions where **Schistosomiasis (Schistosoma haematobium)** is endemic. Chronic irritation from long-term indwelling catheters or bladder stones also predisposes to SCC. * **B. Adenocarcinoma:** This is rare (<2%) and usually arises from the **urachus** (at the dome of the bladder) or in the setting of **bladder exstrophy** or cystitis glandularis. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Cystoscopy with biopsy is the definitive diagnostic tool. * **Most Common Symptom:** Painless, gross hematuria (present in 85% of cases). * **Field Change Effect:** The entire urothelium (from renal pelvis to urethra) is at risk due to "field cancerization," meaning tumors are often multifocal and recurrent. * **Staging:** The **TNM system** is used; the involvement of the **detrusor muscle (T2)** is the critical prognostic factor that determines whether a patient needs radical cystectomy.

Question 1

Xanthogranulomatous pyelonephritis is often associated with infection by which organism?

Accepted Answer

Proteus

Answer

E. coli

Answer

S. aureus

Answer

Klebsiella

Question 2

Which of the following is NOT true about post-streptococcal glomerulonephritis?

Accepted Answer

PSGN develops 1-3 weeks after a skin infection and 2-6 weeks after streptococcal pharyngitis

Answer

Proliferative glomerulonephritis

Answer

PSGN can be seen in the elderly

Answer

More common in males

Question 3

From which of the following does renal oncocytoma arise?

Accepted Answer

Collecting duct

Answer

Loop of Henle

Answer

Proximal tubule

Answer

Bowman's capsule

Question 4

Deficiency of Factor I and Factor H causes which condition?

Accepted Answer

Atypical Hemolytic Uremic Syndrome (HUS)

Answer

Typical Hemolytic Uremic Syndrome (HUS)

Answer

Thrombotic Thrombocytopenic Purpura (TTP)

Answer

Acute Thrombotic Thrombocytopenic Purpura (TTP)

Question 5

Which of the following statements is false regarding hypernephroma?

Accepted Answer

It produces osteosclerotic secondaries on flat bone

Answer

Leather workers have an increased risk

Answer

Arises from the proximal tubular epithelium

Answer

Hb levels may be elevated

Question 6

All the following are immune complex glomerulonephritis EXCEPT:

Accepted Answer

Good pasture's disease (RPGN)

Answer

Acute infectious glomerulonephritis

Answer

Membranous glomerulonephritis

Answer

SLE

Question 7

A patient diagnosed with bronchiectasis 5 years ago presents with leg edema and proteinuria. What is the most likely renal finding?

Accepted Answer

Amyloid Nephropathy

Answer

Minimal Change Disease

Answer

Rapidly Progressive Glomerulonephritis (RPGN)

Answer

Crescenteric Glomerulonephritis

Question 8

Increased IgA deposits are seen in which condition?

Accepted Answer

Henoch Schonlein Purpura

Answer

Minimal Change Glomerulonephritis

Answer

Chronic Pyelonephritis

Answer

Hemolytic Uremic Syndrome

Question 9

Where are the deposits typically found in IgA Nephropathy?

Accepted Answer

Mesangium

Answer

Subepithelial

Answer

Subendocardial

Answer

No deposits

Question 10

What is the most common tumor of the urinary bladder?

Accepted Answer

Transitional cell carcinoma

Answer

Squamous cell carcinoma

Answer

Adenocarcinoma

Answer

Stratified squamous carcinoma

Renal Pathology — MCQs

Renal Pathology — MCQs

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