Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 481: What is the management of a renal cell carcinoma (RCC) less than 4cm in size in an otherwise healthy 40-year-old man?

A. Chemotherapy
B. Radical nephrectomy
C. Partial nephrectomy (Correct Answer)
D. Surgery followed by chemotherapy

Explanation: **Explanation:** The management of Renal Cell Carcinoma (RCC) is primarily surgical, as these tumors are notoriously resistant to chemotherapy and radiotherapy. The choice of surgery depends on the clinical stage (size and localization) of the tumor. **Why Partial Nephrectomy is Correct:** For small renal masses (T1a tumors, defined as **<4 cm**), **Partial Nephrectomy (Nephron-Sparing Surgery)** is the gold standard. In a young, healthy 40-year-old, preserving renal function is a priority to prevent long-term chronic kidney disease. Studies show that for tumors <4 cm, partial nephrectomy offers oncological outcomes (survival rates) equivalent to radical nephrectomy while preserving maximum renal parenchyma. **Why Other Options are Incorrect:** * **Radical Nephrectomy:** While once the standard, it is now reserved for larger tumors (>7 cm or T2) or those where a partial resection is technically impossible due to central location. Performing it for a <4 cm mass in a healthy patient is considered "over-treatment." * **Chemotherapy:** RCC is **chemo-resistant**. Systemic therapy (Tyrosine Kinase Inhibitors like Sunitinib or Immunotherapy) is reserved for metastatic disease (Stage IV), not localized small masses. * **Surgery followed by Chemotherapy:** Adjuvant chemotherapy has no proven role in localized RCC. **High-Yield Clinical Pearls for NEET-PG:** * **T1a:** <4 cm (Partial Nephrectomy is the treatment of choice). * **T1b:** 4–7 cm (Partial Nephrectomy can still be considered if technically feasible). * **Triad of RCC:** Hematuria, Flank pain, and Palpable mass (seen in only 10% of cases; most are now incidentalomas). * **Most common histological type:** Clear cell carcinoma (originates from the Proximal Convoluted Tubule). * **Most common site of metastasis:** Lungs ("Cannon-ball" secondaries).

Question 482: What is the gold standard investigation for renovascular hypertension in a patient showing asymmetrical kidneys on ultrasound?

A. Captopril radionuclide scan
B. Spiral CT
C. MRI
D. Angiography (Correct Answer)

Explanation: **Explanation:** Renovascular hypertension (RVH) is most commonly caused by atherosclerosis or fibromuscular dysplasia, leading to renal artery stenosis (RAS). When a patient presents with asymmetrical kidneys on ultrasound, it suggests chronic ischemia and necessitates a definitive diagnosis. **1. Why Angiography is the Correct Answer:** **Digital Subtraction Angiography (DSA)** remains the **Gold Standard** for diagnosing renal artery stenosis. It provides the highest spatial resolution to visualize the anatomy of the renal vasculature. Its primary advantage is that it is both **diagnostic and therapeutic**, allowing for immediate intervention via percutaneous transluminal renal angioplasty (PTRA) or stenting if a significant lesion is identified. **2. Why Other Options are Incorrect:** * **Captopril Radionuclide Scan:** This is a functional screening test, not an anatomical one. While it helps determine if a known stenosis is hemodynamically significant, it has high false-negative rates in patients with bilateral disease or renal failure. * **Spiral CT (CTA) and MRI (MRA):** These are excellent **non-invasive screening tools** with high sensitivity and specificity. However, they can overestimate the degree of stenosis and cannot be used for concurrent intervention. MRA is also contraindicated in patients with metallic implants or severe renal insufficiency (risk of NSF). **Clinical Pearls for NEET-PG:** * **Best Initial Screening Test:** Duplex Doppler Ultrasound (non-invasive and cheap). * **Gold Standard:** Digital Subtraction Angiography (DSA). * **Classic Presentation:** Sudden onset hypertension in young females (Fibromuscular dysplasia) or elderly males (Atherosclerosis), or hypertension refractory to ≥3 drugs. * **Key Sign:** Presence of an abdominal bruit or a >1.5 cm difference in kidney size on ultrasound.

Question 483: What is the most common metabolic abnormality predisposing patients to renal stone formation?

A. Hyperuricemia
B. Hypercalciuria (Correct Answer)
C. Distal renal tubular acidosis
D. Increased urine volume

Explanation: **Explanation:** **Hypercalciuria** is the most common metabolic abnormality identified in patients with nephrolithiasis, occurring in approximately 40–60% of cases. It is defined as urinary calcium excretion >4 mg/kg/day (or >250 mg/day in women and >300 mg/day in men). The increased concentration of calcium ions in the urine leads to supersaturation, promoting the crystallization of calcium oxalate or calcium phosphate, which are the most common types of renal stones. **Analysis of Options:** * **Hyperuricemia (A):** While elevated serum uric acid can lead to gouty diathesis and uric acid stones, it is less common than hypercalciuria. Note that hyperuricosuria (excess urine uric acid) is a risk factor for calcium stones, but not the most frequent one. * **Distal Renal Tubular Acidosis (C):** Type 1 RTA is associated with nephrocalcinosis and calcium phosphate stones due to alkaline urine and hypocitraturia. However, it is a relatively rare systemic condition compared to idiopathic hypercalciuria. * **Increased Urine Volume (D):** This is actually a **protective factor**. Low urine volume (dehydration) is a major risk factor for stone formation as it increases the concentration of lithogenic solutes. **High-Yield Pearls for NEET-PG:** * **Most common stone type:** Calcium Oxalate (specifically Calcium Oxalate Monohydrate/Whewellite). * **Most common metabolic abnormality:** Hypercalciuria. * **Most common inhibitor deficiency:** Hypocitraturia (Citrate normally inhibits stone formation by binding calcium). * **Dietary Advice:** Patients with calcium stones should **not** restrict dietary calcium (as this increases oxalate absorption); instead, they should decrease sodium and animal protein intake.

Question 484: In prostate cancer metastasis, which lymph nodes are most commonly affected?

A. Sacral lymph nodes
B. Obturator lymph nodes (Correct Answer)
C. Paraaortic lymph nodes
D. Iliac lymph nodes

Explanation: ### Explanation **1. Why Obturator Lymph Nodes are Correct:** Prostate cancer primarily spreads via the lymphatic system in a predictable, stepwise fashion. The **obturator lymph nodes** (part of the internal iliac group) are the **first-tier** primary nodal station and the most common site for initial metastasis. During a Radical Prostatectomy, a "Standard Pelvic Lymph Node Dissection" (PLND) specifically targets the tissue around the obturator nerve for this reason, as it provides the most accurate nodal staging. **2. Analysis of Incorrect Options:** * **Iliac Lymph Nodes (Option D):** While the prostate does drain into the internal and external iliac chains, these are usually involved *after* or concurrent with the obturator nodes. "Iliac" is a broad category; specifically, the obturator nodes are the most frequent sub-group involved. * **Sacral Lymph Nodes (Option A):** These nodes (presacral) are involved in more advanced stages or in tumors originating from the posterior aspect of the prostate, but they are not the most common initial site. * **Paraaortic Lymph Nodes (Option C):** These represent distant nodal spread (M1a disease). Involvement of paraaortic nodes occurs late in the disease progression, typically after the pelvic nodes are heavily involved. **3. Clinical Pearls for NEET-PG:** * **Most Common Site of Distant Metastasis:** Bone (specifically the **Lumbar Spine**). * **Route to Spine:** Spread occurs via the **Batson’s Plexus** (a valveless vertebral venous plexus) which connects the prostatic venous plexus to the vertebral veins. * **Osteoblastic Lesions:** Prostate cancer is the classic cause of **osteoblastic** (bone-forming) metastases on X-ray, unlike most other cancers which are osteolytic. * **Staging Tool:** The **Gleason Scoring System** is the most important prognostic indicator for prostate cancer.

Question 485: A 16-year-old female presents with symptoms suggesting a need for Foley's catheterization. What is the most likely indication for its use?

A. Acute urinary retention (Correct Answer)
B. Carcinoma of the penis
C. Pyonephrosis
D. None of the above

Explanation: **Explanation:** **1. Why Acute Urinary Retention is Correct:** Acute urinary retention (AUR) is the most common and primary indication for Foley’s catheterization. It is a medical emergency characterized by the sudden inability to pass urine, leading to painful bladder distension. The immediate goal of management is to decompress the bladder and provide symptomatic relief, which is achieved by inserting a Foley’s catheter to bypass the obstruction or assist a non-contractile detrusor muscle. **2. Why the Other Options are Incorrect:** * **Carcinoma of the Penis:** This is a contraindication or a complication rather than an indication for standard Foley’s catheterization. In cases of malignancy involving the urethra, catheterization may be difficult or contraindicated due to the risk of bleeding or tumor seeding; suprapubic cystostomy is often preferred. Furthermore, the patient in the question is female. * **Pyonephrosis:** This refers to infected hydronephrosis (pus in the collecting system). While drainage is mandatory, the primary treatment is **Percutaneous Nephrostomy (PCN)** or retrograde stenting to drain the kidney itself. A Foley’s catheter only drains the bladder and does not address the upper urinary tract obstruction/infection. **3. NEET-PG High-Yield Pearls:** * **Absolute Contraindication:** The most important contraindication for Foley’s catheterization is **suspected urethral injury** (often seen in pelvic fractures), signaled by "blood at the meatus," a high-riding prostate, or perineal hematoma. * **Size Selection:** For adults, 14–16 French (Fr) catheters are standard. * **Material:** Silicone catheters are preferred for long-term use (up to 3 months) to reduce encrustation and infection risk compared to latex. * **Diagnostic Use:** Foley’s is also used for monitoring hourly urine output in critically ill patients or during major surgeries to assess renal perfusion.

Question 486: Prostatic calculi are primarily composed of which substance?

A. Calcium carbonate
B. Calcium oxalate
C. Calcium phosphate (Correct Answer)
D. Triple phosphate

Explanation: **Explanation:** **Correct Answer: C. Calcium phosphate** Prostatic calculi are common, often asymptomatic findings in older men. They are primarily formed by the precipitation of prostatic secretions (corpora amylacea) and the calcification of these organic elements. Chemically, these stones are predominantly composed of **calcium phosphate** (specifically hydroxyapatite). They are typically found in the acini of the prostate gland or within the prostatic ducts, often associated with chronic prostatitis or benign prostatic hyperplasia (BPH). **Analysis of Options:** * **A. Calcium carbonate:** While found in some biological calcifications, it is not the primary constituent of prostatic stones. * **B. Calcium oxalate:** This is the most common component of **urinary (renal) calculi**, but it is rarely the primary component of endogenous prostatic stones. * **D. Triple phosphate (Struvite):** These are "infection stones" (Magnesium Ammonium Phosphate) typically found in the bladder or renal pelvis associated with urease-producing bacteria (e.g., *Proteus*). They are not characteristic of the prostate. **Clinical Pearls for NEET-PG:** * **Endogenous vs. Exogenous:** Endogenous stones (formed from prostatic fluid) are calcium phosphate. Exogenous stones (formed from urine stasis in the prostatic urethra) may contain calcium oxalate or urates. * **Radiology:** On X-ray or CT, they appear as multiple, small, radiopaque shadows behind the symphysis pubis. * **Clinical Significance:** They are usually incidental findings and do not require treatment unless associated with recurrent prostatic abscesses or chronic pelvic pain syndrome. * **Surgical Note:** During TURP (Transurethral Resection of the Prostate), these stones are often encountered as "gritty" material when the surgeon reaches the surgical capsule.

Question 487: A 60-year-old male presents with hematuria at the onset of micturition. What is the most likely cause?

A. Urethral stone (Correct Answer)
B. Bladder tumor
C. Ureteric stone
D. Prostatitis

Explanation: The timing of hematuria during the act of micturition is a classic clinical indicator for localizing the site of pathology in the urinary tract. ### **Explanation of the Correct Answer** **Initial Hematuria** (blood at the onset of micturition) indicates a lesion located in the **urethra**, distal to the bladder neck. When the patient begins to void, the initial stream flushes out the blood or clots accumulated in the urethra. As the bladder continues to empty, the urine becomes clear. A **urethral stone** or urethritis are classic causes of this presentation. ### **Analysis of Incorrect Options** * **Bladder Tumor:** Typically causes **Total Hematuria** (blood throughout the entire stream) because the blood mixes with the urine stored in the bladder. If the tumor is at the bladder neck, it may occasionally cause terminal hematuria. * **Ureteric Stone:** Causes **Total Hematuria**. Since the bleeding occurs in the upper urinary tract (ureter/kidney), the blood is thoroughly mixed with urine before it reaches the bladder. * **Prostatitis:** Along with conditions like BPH or bladder neck lesions, this typically causes **Terminal Hematuria** (blood at the end of micturition). This occurs because the prostatic urethra and bladder neck contract at the end of voiding, squeezing blood from the congested mucosa. ### **NEET-PG High-Yield Pearls** * **Initial Hematuria:** Urethral cause (e.g., stone, trauma, urethritis). * **Terminal Hematuria:** Bladder neck or Prostatic cause (e.g., Prostatitis, BPH, Cystitis). * **Total Hematuria:** Kidney, Ureter, or Bladder body cause (e.g., RCC, Ureteric stone, Bladder cancer). * **Painless Hematuria in an elderly male:** Always rule out Malignancy (Bladder Cancer is the most common cause). * **Worm-like clots:** Suggests bleeding from the upper urinary tract (ureter).

Question 488: What is the treatment of choice for transitional cell carcinoma in the renal pelvis?

A. Partial nephrectomy
B. Total nephrectomy
C. Radical nephrectomy
D. Radical nephroureterectomy (Correct Answer)

Explanation: ### Explanation **1. Why Radical Nephroureterectomy is the Correct Answer:** Transitional Cell Carcinoma (TCC), now more commonly referred to as **Urothelial Carcinoma**, arises from the urothelium lining the renal pelvis. A unique characteristic of urothelial tumors is their **"polychronotopicity"** (tendency to recur at different times and sites) and the risk of **seeding** via the urinary stream. Because the entire urothelial lining from the renal pelvis down to the bladder cuff is at high risk for synchronous or metachronous recurrence (up to 30-50% risk in the ureteral stump), the gold standard treatment is **Radical Nephroureterectomy with excision of a bladder cuff**. **2. Why Other Options are Incorrect:** * **Partial Nephrectomy (A):** This is the treatment of choice for Renal Cell Carcinoma (RCC) <4cm (T1a), but it is contraindicated in TCC due to the high risk of local recurrence and multifocality. * **Total Nephrectomy (B):** Removing only the kidney leaves the ureter behind. The remaining ureteral stump is a frequent site for tumor recurrence in TCC. * **Radical Nephrectomy (C):** This involves removing the kidney, Gerota’s fascia, and adrenal gland. While standard for RCC, it is inadequate for TCC because it does not include the entire ureter and bladder cuff. **3. High-Yield Clinical Pearls for NEET-PG:** * **Standard of Care:** Radical Nephroureterectomy + Excision of Bladder Cuff. * **Diagnostic Gold Standard:** CT Urography (shows "filling defects"). * **Risk Factors:** Smoking (most common), Phenacetin abuse, Balkan endemic nephropathy, and Aristolochic acid. * **Exception:** Conservative management (e.g., ureteroscopic ablation) is considered only in solitary kidneys, bilateral tumors, or significant renal insufficiency.

Question 489: A six-month-old girl presents with recurrent urinary tract infections. Ultrasound of the abdomen reveals bilateral hydronephrosis. A micturating cystourethrogram (MCU) demonstrates bilateral Grade IV vesicoureteral reflux. What is the initial treatment of choice?

A. Endoscopic injection of Deflux at the ureteral orifices
B. Ureteral reimplantation
C. Bilateral ureterostomy
D. Prophylactic antibiotics (Correct Answer)

Explanation: **Explanation:** The primary goal in managing Vesicoureteral Reflux (VUR) in infants is the prevention of recurrent urinary tract infections (UTIs) and subsequent renal scarring (reflux nephropathy). **1. Why Prophylactic Antibiotics is Correct:** In a six-month-old infant, the initial management for VUR (even high-grade like Grade IV) is **medical management with continuous antibiotic prophylaxis (CAP)**. This is because there is a high rate of spontaneous resolution or improvement of VUR as the child grows and the vesicoureteral junction matures. Low-dose antibiotics (e.g., Trimethoprim-sulfamethoxazole or Nitrofurantoin in older infants) keep the urine sterile, preventing pyelonephritis while waiting for potential resolution. **2. Why Other Options are Incorrect:** * **A & B (Endoscopic Injection/Ureteral Reimplantation):** Surgical or endoscopic interventions are generally reserved for cases where medical management fails (breakthrough UTIs), there is progressive renal scarring, or the VUR fails to resolve as the child nears puberty. They are not the *initial* choice in a 6-month-old. * **C (Bilateral Ureterostomy):** This is a diversion procedure reserved for extreme cases of "megaureters" with failing renal function or sepsis that cannot be managed by simpler means; it is not standard for VUR. **Clinical Pearls for NEET-PG:** * **Grading:** VUR is graded I–V based on the **International Reflux Study** (MCU findings). Grade IV involves gross dilation of the ureter and pelvis with obliteration of the sharp angle of the calyces. * **Spontaneous Resolution:** Lower grades (I-III) have a higher chance of resolution, but even Grade IV in an infant warrants a trial of medical management. * **Investigation of Choice:** **Micturating Cystourethrogram (MCU/VCUG)** is the gold standard for diagnosis and grading. * **Associated Condition:** VUR is the most common cause of hydronephrosis in children after PUV (Posterior Urethral Valves) is ruled out.

Question 490: What is ureteral obstruction?

A. It is best identified with ultrasound (USG).
B. It is associated with deterioration of renal function and rising blood urea nitrogen (BUN) and creatinine values.
C. It is commonly caused by a urinary tract calculus. (Correct Answer)
D. It usually requires open surgical relief of the obstruction.

Explanation: **Explanation:** Ureteral obstruction refers to a structural or functional hindrance to the flow of urine from the renal pelvis to the bladder. **1. Why Option C is Correct:** The most common cause of acute ureteral obstruction in clinical practice is a **urinary tract calculus (urolithiasis)**. Stones typically impact at areas of anatomical narrowing: the ureteropelvic junction (UPJ), the crossing of the iliac vessels, and the vesicoureteric junction (VUJ). **2. Why Other Options are Incorrect:** * **Option A:** While Ultrasound (USG) is excellent for detecting hydronephrosis (dilation), it has low sensitivity for identifying small ureteral stones, especially in the mid-ureter. The **gold standard** investigation for ureteral obstruction/calculi is a **Non-Contrast Computed Tomography (NCCT) KUB**. * **Option B:** Unilateral ureteral obstruction rarely causes a rise in BUN or Creatinine if the contralateral kidney is healthy and functioning. Significant azotemia typically occurs only in bilateral obstruction or when the patient has a solitary functioning kidney. * **Option D:** Most ureteral obstructions today are managed via **minimally invasive techniques** (e.g., Double-J stenting, PCNL, or Ureteroscopy/URSL). Open surgery is reserved for complex cases or failed endoscopic interventions. **Clinical Pearls for NEET-PG:** * **Most common site of stone impaction:** Vesicoureteric Junction (VUJ). * **Investigation of Choice:** NCCT KUB (highest sensitivity and specificity). * **Management Priority:** If obstruction is associated with infection (pyonephrosis) and fever, it is a **urological emergency** requiring immediate decompression via DJ stent or Percutaneous Nephrostomy (PCN). * **Dietary Fact:** Low calcium intake actually *increases* the risk of stone formation; patients should maintain normal calcium but low oxalate intake.

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Urology — MCQs

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