Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 341: Which of the following statements regarding Wilm's tumour is true?

A. Bone metastasis
B. Always unilateral
C. Very commonly metastasizes to the liver
D. None of the above (Correct Answer)

Explanation: **Explanation:** Wilms’ tumor (Nephroblastoma) is the most common primary renal malignancy in children. Understanding its metastatic pattern and presentation is crucial for NEET-PG. **Why "None of the above" is correct:** 1. **Option A (Bone metastasis):** Wilms’ tumor characteristically **does not** spread to the bone. If a pediatric renal mass presents with bone metastasis, the diagnosis is more likely **Clear Cell Sarcoma of the Kidney (CCSK)**, often referred to as the "Bone-Seeking Sarcoma." 2. **Option B (Always unilateral):** While 90-95% of cases are unilateral, approximately **5-10% are bilateral** (synchronous or metachronous). Bilateral involvement is frequently associated with genetic syndromes like WAGR or Denys-Drash. 3. **Option C (Very commonly metastasizes to the liver):** The most common site of distant metastasis for Wilms’ tumor is the **Lungs (85%)**, followed by the liver. While liver spread occurs, it is not the "most common" or "very common" primary site compared to pulmonary involvement. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presentation:** An asymptomatic, large, smooth abdominal mass that **does not cross the midline** (unlike Neuroblastoma). * **Staging:** Unlike many cancers, Wilms’ tumor staging is based on both surgical findings and pathological examination. * **Triphasic Histology:** Classic Wilms’ consists of three elements: Blastemal, Stromal, and Epithelial cells. * **Syndromes:** Associated with **WAGR** (Wilms, Aniridia, Genitourinary anomalies, Retardation), **Beckwith-Wiedemann**, and **Denys-Drash** syndromes. * **Prognosis:** Overall survival is excellent (>90% for localized disease), making it a success story in pediatric oncology.

Question 342: Randall's plaques are associated with which of the following?

A. Bile stones
B. Urinary stones (Correct Answer)
C. Premalignant lesions
D. Bacterial infections

Explanation: **Explanation:** **Randall’s plaques** are subepithelial calcifications found at the tips of the renal papillae. They are composed of **calcium phosphate (apatite)** and serve as the essential "nidus" or anchoring point for the formation of **calcium oxalate urinary stones**. 1. **Why Option B is correct:** According to the Randall’s plaque theory, the process begins in the basement membrane of the Thin Loop of Henle. These deposits migrate through the interstitium to the papillary tip, eventually eroding through the urothelium. Once exposed to supersaturated urine, they act as a surface for calcium oxalate crystallization, leading to nephrolithiasis. 2. **Why other options are incorrect:** * **A. Bile stones:** Gallstones (cholelithiasis) form due to imbalances in cholesterol, bilirubin, and bile salts within the gallbladder, unrelated to papillary calcification. * **C. Premalignant lesions:** Randall’s plaques are benign mineral deposits and have no association with malignancy or cellular dysplasia. * **D. Bacterial infections:** While some stones (Struvite) are associated with infection (Proteus), Randall’s plaques are a metabolic/physiologic phenomenon primarily linked to idiopathic calcium stone formers. **High-Yield Facts for NEET-PG:** * **Composition:** Primarily Calcium Phosphate (Hydroxyapatite). * **Location:** Renal papillary interstitium (subepithelial). * **Carr’s Pouches:** Another theory suggesting stones form in obstructed lymphatics of the kidney (often confused with Randall’s plaques). * **Imaging:** On non-contrast CT (NCCT), these appear as tiny hyperdense spots at the papillary tips before a formal stone is visible.

Question 343: What is the commonest type of urinary stone associated with urinary tract infections?

A. Phosphate stones (Correct Answer)
B. Urate stones
C. Cysteine stones
D. Calcium oxalate stones

Explanation: **Explanation:** The correct answer is **Phosphate stones**, specifically **Struvite stones** (Magnesium Ammonium Phosphate). These are classically known as "infection stones." **Why Phosphate stones are correct:** The underlying mechanism involves infection with **urease-producing bacteria** (e.g., *Proteus mirabilis*, *Klebsiella*, *Pseudomonas*). These bacteria hydrolyze urea into ammonia and carbon dioxide. The resulting ammonia increases the urinary pH, making it **alkaline**. In this alkaline environment, phosphate precipitates, leading to the formation of Struvite stones. These stones often grow rapidly and fill the renal pelvis, forming **Staghorn calculi**. **Why the other options are incorrect:** * **Urate stones:** These are associated with hyperuricemia (e.g., Gout) and form in **acidic urine**, not as a result of infection. * **Cysteine stones:** These are caused by an autosomal recessive genetic defect in the transport of dibasic amino acids (COLA: Cysteine, Ornithine, Lysine, Arginine). * **Calcium oxalate stones:** These are the **most common type of urinary stones overall**, but they are typically associated with metabolic factors (hypercalciuria, hyperoxaluria) rather than primary infection. **High-Yield Clinical Pearls for NEET-PG:** * **Commonest stone overall:** Calcium Oxalate (specifically Calcium Oxalate Monohydrate/Whewellite). * **Commonest stone in UTI:** Struvite / Triple Phosphate / Magnesium Ammonium Phosphate. * **Radiology:** Struvite stones are radio-opaque; Uric acid stones are **radiolucent** (visible on CT but not on X-ray). * **Microscopy:** Struvite stones show characteristic **"Coffin-lid"** crystals. * **Treatment:** Requires complete surgical removal of the stone and eradication of the infection to prevent recurrence.

Question 344: What is the most common site for secondary metastasis in a case of hypernephroma?

A. Adrenal
B. Lungs (Correct Answer)
C. Brain
D. Bones

Explanation: **Explanation:** **Hypernephroma**, also known as Renal Cell Carcinoma (RCC), is notorious for its hematogenous spread. The **lungs** are the most common site for secondary metastasis, occurring in approximately 50–60% of patients with metastatic disease. This occurs because the tumor frequently invades the renal vein and inferior vena cava (IVC); tumor emboli then travel directly through the venous circulation to the pulmonary capillary bed. Radiologically, these often appear as multiple, well-defined, rounded lesions known as **"Cannon-ball metastasis."** **Analysis of Incorrect Options:** * **Adrenal (A):** While RCC can spread to the ipsilateral adrenal gland via direct extension or venous routes, it is far less common than pulmonary involvement. * **Brain (C):** Brain metastasis occurs in only about 5% of cases and is usually a late-stage manifestation. * **Bones (D):** Bone is the second most common site of distant metastasis (approx. 30%). These lesions are characteristically **osteolytic** and "pulsatile" due to the high vascularity of the tumor. **High-Yield Clinical Pearls for NEET-PG:** * **Most common histological subtype:** Clear cell carcinoma (originates from the Proximal Convoluted Tubule). * **Classic Triad:** Hematuria, loin pain, and palpable mass (seen in only 10% of cases; signifies advanced disease). * **Stauffer’s Syndrome:** Reversible hepatic dysfunction (raised ALP) without evidence of liver metastasis; a common paraneoplastic syndrome in RCC. * **Varicocele:** A left-sided non-reducing varicocele may be the presenting sign due to obstruction of the left testicular vein by a renal vein thrombus.

Question 345: An ectopic ureter opening is not typically located in which of the following structures?

A. Bulbar urethra (Correct Answer)
B. Prostatic urethra
C. Seminal vesicle
D. Bladder neck

Explanation: **Explanation:** The location of an ectopic ureter is determined by the embryological development of the **Mesonephric (Wolffian) duct**. In both sexes, an ectopic ureter always opens **distal to the bladder neck**. **Why Bulbar Urethra is the Correct Answer:** In males, the ureteric bud originates from the mesonephric duct. If it fails to migrate correctly, it can open into any structure derived from the mesonephric duct. In the male anatomy, this includes the prostatic urethra (above the verumontanum), seminal vesicles, and vas deferens. The **bulbar urethra**, however, is located distal to the external sphincter and is not a typical site for ectopic ureteral insertion. **Analysis of Incorrect Options:** * **Prostatic Urethra:** This is the most common site for an ectopic ureter in males. It occurs when the ureteric bud fails to separate from the mesonephric duct early enough. * **Seminal Vesicle:** Since the seminal vesicles develop directly from the distal mesonephric duct, they are a classic site for ectopic ureteral drainage, often associated with renal dysgenesis. * **Bladder Neck:** The bladder neck is a common site for "low-grade" ectopia before the ureter reaches the more distal urethral structures. **High-Yield Clinical Pearls for NEET-PG:** 1. **Rule of Gender:** In **males**, ectopic ureters always open **above the external sphincter**, so they present with UTI or pain, but **never incontinence**. 2. **In Females:** Ectopic ureters can open into the vagina, vestibule, or urethra (distal to the sphincter), leading to the classic history of **constant dribbling of urine despite normal voiding patterns**. 3. **Weigert-Meyer Law:** In a duplex system, the ureter draining the **upper pole** is the one that is ectopic and prone to obstruction (opening medially and inferiorly).

Question 346: Prophylactic gonadectomy is indicated in which of the following conditions?

A. Testicular feminizing syndrome (Correct Answer)
B. Klinefelter's syndrome
C. Kallmann's syndrome
D. Down's syndrome

Explanation: **Explanation:** **1. Why Testicular Feminizing Syndrome (Androgen Insensitivity Syndrome) is correct:** In Testicular Feminizing Syndrome (Complete Androgen Insensitivity Syndrome), patients have a **46, XY karyotype** with undescended intra-abdominal testes. These testes are at a significantly increased risk of developing germ cell tumors, most notably **gonadoblastomas and dysgerminomas**. While the risk is relatively low before puberty, it increases to approximately 2-5% in adulthood. Therefore, prophylactic gonadectomy is indicated. *Note:* In complete AIS, surgery is usually deferred until after puberty (late teens) to allow for natural feminization via the peripheral conversion of testosterone to estrogen. **2. Why the other options are incorrect:** * **B. Klinefelter’s Syndrome (47, XXY):** While these patients have an increased risk of extragonadal germ cell tumors (mediastinal) and breast cancer, the risk of testicular malignancy is not high enough to justify prophylactic gonadectomy. * **C. Kallmann’s Syndrome:** This is a form of hypogonadotropic hypogonadism (GnRH deficiency) associated with anosmia. The testes are typically small and prepubertal, but there is no inherent predisposition to malignancy requiring removal. * **D. Down’s Syndrome:** Although patients with Down’s syndrome have a higher incidence of cryptorchidism (which is a risk factor for cancer), the syndrome itself is not a primary indication for prophylactic gonadectomy. **Clinical Pearls for NEET-PG:** * **Swyer Syndrome (46, XY Pure Gonadal Dysgenesis):** Unlike AIS, gonadectomy in Swyer syndrome should be performed **immediately upon diagnosis** (even before puberty) because the risk of malignancy is much higher (~30%) and occurs earlier. * **Most common tumor:** The most common tumor arising in these dysgenetic gonads is **Gonadoblastoma**. * **Management Tip:** Post-gonadectomy, patients require lifelong Hormone Replacement Therapy (HRT) to prevent osteoporosis and maintain secondary sexual characteristics.

Question 347: Which of the following statements concerning the diagnosis and management of retroperitoneal fibrosis is FALSE?

A. Most patients present with dull, non-colicky back, flank, or abdominal pain.
B. Evidence of impaired renal function with an elevated blood urea nitrogen is common.
C. The diagnosis is most commonly suggested by intravenous pyelography, although contrast studies with CT scan or MRI are useful in further defining the disease.
D. The prognosis for nonmalignant retroperitoneal fibrosis is grim with progression of disease until death occurring in most patients. (Correct Answer)

Explanation: **Explanation:** Retroperitoneal Fibrosis (RPF), also known as Ormond’s disease, is characterized by the development of extensive fibrosis in the retroperitoneum, often encasing the ureters and great vessels. **1. Why Option D is the Correct (False) Statement:** The prognosis for nonmalignant (idiopathic) RPF is actually **excellent** with appropriate management. Most patients respond well to medical therapy (corticosteroids, immunosuppressants) and surgical intervention (ureterolysis). It is not a "grim" disease; mortality is low, and renal function can often be preserved or recovered. Only the malignant form of RPF (associated with lymphomas or metastatic cancers) carries a poor prognosis. **2. Analysis of Incorrect (True) Options:** * **Option A:** Pain is the most common presenting symptom (80-90%). It is typically described as a dull, poorly localized ache in the flank or lower abdomen, unlike the sharp, colicky pain of urolithiasis. * **Option B:** Since the fibrosis often compresses the ureters medially, bilateral ureteral obstruction is common, leading to obstructive uropathy and elevated BUN/Creatinine levels. * **Option C:** Historically, IVP was the initial test showing the classic triad: hydronephrosis, medial deviation of the ureters, and extrinsic compression. Today, CT and MRI are the gold standards for defining the extent of the plaque and ruling out malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad on Imaging:** Medial deviation of ureters, hydronephrosis, and extrinsic ureteral compression. * **Associated Drugs:** Methysergide (most common historical association), beta-blockers, and hydralazine. * **IgG4-Related Disease:** Many idiopathic cases are now recognized as part of the IgG4-related systemic disease spectrum. * **Treatment:** Corticosteroids are the first-line medical therapy; Ureterolysis with intraperitoneal transposition is the surgical procedure of choice.

Question 348: What is the most common clinical presentation of idiopathic retroperitoneal fibrosis?

A. Ureteral obstruction (Correct Answer)
B. Leg edema
C. Calf claudication
D. Jaundice

Explanation: **Explanation:** **Idiopathic Retroperitoneal Fibrosis (Ormond’s Disease)** is characterized by the proliferation of aberrant fibro-inflammatory tissue in the retroperitoneum, which typically encases and compresses midline structures. 1. **Why Ureteral Obstruction is Correct:** The retroperitoneal plaque most commonly develops around the infrarenal aorta and extends laterally. The **ureters** are the most vulnerable structures to this extrinsic compression. As the fibrosis progresses, it pulls the ureters medially (**medial deviation**) and compresses them, leading to obstructive uropathy. Patients typically present with dull, non-colicky loin pain and progressive renal dysfunction. This is the hallmark clinical presentation in over 75–80% of cases. 2. **Why Other Options are Incorrect:** * **Leg Edema:** While the plaque can compress the Inferior Vena Cava (IVC) or iliac veins, causing venous stasis and edema, this occurs less frequently than ureteral involvement. * **Calf Claudication:** Compression of the aorta or iliac arteries can occur, leading to lower limb ischemia, but the arterial walls are relatively resistant to compression compared to the ureters. * **Jaundice:** This would require involvement of the porta hepatis or biliary tree, which is extremely rare as the fibrosis is usually centered at the L4-L5 level. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Radiographic Findings:** Medial deviation of ureters, extrinsic compression (hydroureteronephrosis), and a "tapered" appearance of the ureter. * **Associated Conditions:** Often linked to **IgG4-related disease**. * **Drug Association:** Historically linked to **Methysergide** (an ergot alkaloid). * **Diagnosis:** CT/MRI shows a well-demarcated mass; Biopsy is the gold standard to rule out malignancy. * **Management:** Corticosteroids are the first-line medical treatment; surgical options include **ureterolysis** with intraperitoneal transposition.

Question 349: Perineal hematoma after trauma is most commonly due to which of the following?

A. Rupture of the membranous urethra
B. Rupture of the bulbar urethra (Correct Answer)
C. Pelvic organ blunt trauma
D. Rupture of the bladder

Explanation: **Explanation:** The correct answer is **Rupture of the bulbar urethra**. **1. Why Bulbar Urethra is correct:** The bulbar urethra is the most common site of injury in **straddle-type trauma** (e.g., falling onto a bicycle frame or manhole cover). In such injuries, the bulbar urethra is crushed against the inferior surface of the pubic symphysis. Because this injury occurs **below the urogenital diaphragm**, blood and urine extravasate into the superficial perineal pouch. This results in the classic clinical presentation of a **"butterfly-shaped" perineal hematoma** and bruising of the scrotum and penis. **2. Why other options are incorrect:** * **Membranous Urethra:** This is typically injured in **pelvic fractures** (deceleration injuries). It occurs above or within the urogenital diaphragm. While it can cause a high-riding prostate, it does not typically present with a primary perineal hematoma unless the fascia is severely disrupted. * **Pelvic Organ Blunt Trauma:** While this can cause internal bleeding, it rarely manifests as a localized perineal hematoma unless specifically involving the lower urinary tract. * **Rupture of the Bladder:** Extraperitoneal bladder rupture usually leads to pain and tenderness in the suprapubic region, not the perineum. Intraperitoneal rupture leads to signs of peritonitis. **Clinical Pearls for NEET-PG:** * **Triad of Urethral Injury:** Blood at the external meatus, inability to void, and a palpable distended bladder. * **Fascial Boundaries:** In bulbar injuries, extravasation is limited by **Colles' fascia** (perineum), **Scarpa’s fascia** (abdominal wall), and **Dartos fascia** (penis/scrotum). * **Gold Standard Investigation:** Retrograde Urethrogram (RUG). **Never** attempt catheterization before RUG if a urethral injury is suspected.

Question 350: Staghorn calculus is primarily composed of which substance?

A. Oxalate
B. Phosphate (Correct Answer)
C. Uric acid
D. Cystine

Explanation: **Explanation:** **Staghorn calculi** are large, branching stones that occupy the renal pelvis and extend into at least two calyces, resembling the antlers of a deer. **Why Phosphate is correct:** The primary component of staghorn calculi is **Struvite** (Magnesium Ammonium Phosphate) or **Triple Phosphate**. These stones form exclusively in the presence of **urease-producing bacteria** (most commonly *Proteus mirabilis*, followed by *Klebsiella* and *Pseudomonas*). These organisms split urea into ammonia, which increases the urinary pH (alkaline urine). In this alkaline environment, phosphate precipitates, leading to rapid stone growth and the characteristic branching shape. **Why other options are incorrect:** * **Oxalate (Calcium Oxalate):** This is the most common type of renal stone overall. While they can be large, they typically form discrete, hard, spiky stones (mulberry stones) rather than the massive branching staghorn configuration. * **Uric acid:** These stones are radiolucent and typically form in acidic urine. While they can occasionally form staghorn shapes, it is rare compared to phosphate. * **Cystine:** These are rare genetic stones (Cystinuria). While they can form staghorn shapes, they are much less common than struvite stones. **NEET-PG High-Yield Pearls:** * **Radiology:** Staghorn calculi are **radio-opaque** (though less dense than calcium oxalate). * **Microscopy:** Struvite crystals have a characteristic **"Coffin-lid"** appearance. * **Treatment:** The gold standard treatment for staghorn calculus is **Percutaneous Nephrolithotomy (PCNL)**. * **Risk:** If left untreated, they lead to recurrent UTIs, pyonephrosis, and eventual renal failure.

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Renal Cell Carcinoma

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Testicular Tumors

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Urinary Incontinence

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Urology — MCQs

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