Urology Practice Questions

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

None of the above. **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.

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

Urinary stones. **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.

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

Phosphate stones. **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.

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

Lungs. **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.

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

Bulbar urethra. **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).

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

Rupture of the bulbar urethra. **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.

Q: Staghorn calculus is primarily composed of which substance?

Phosphate. **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.

Question 1

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

Accepted Answer

None of the above

Answer

Bone metastasis

Answer

Always unilateral

Answer

Very commonly metastasizes to the liver

Question 2

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

Accepted Answer

Urinary stones

Answer

Bile stones

Answer

Premalignant lesions

Answer

Bacterial infections

Question 3

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

Accepted Answer

Phosphate stones

Answer

Urate stones

Answer

Cysteine stones

Answer

Calcium oxalate stones

Question 4

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

Accepted Answer

Lungs

Answer

Adrenal

Answer

Brain

Answer

Bones

Question 5

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

Accepted Answer

Bulbar urethra

Answer

Prostatic urethra

Answer

Seminal vesicle

Answer

Bladder neck

Question 6

Prophylactic gonadectomy is indicated in which of the following conditions?

Accepted Answer

Testicular feminizing syndrome

Answer

Klinefelter's syndrome

Answer

Kallmann's syndrome

Answer

Down's syndrome

Question 7

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

Accepted Answer

The prognosis for nonmalignant retroperitoneal fibrosis is grim with progression of disease until death occurring in most patients.

Answer

Most patients present with dull, non-colicky back, flank, or abdominal pain.

Answer

Evidence of impaired renal function with an elevated blood urea nitrogen is common.

Answer

The diagnosis is most commonly suggested by intravenous pyelography, although contrast studies with CT scan or MRI are useful in further defining the disease.

Question 8

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

Accepted Answer

Ureteral obstruction

Answer

Leg edema

Answer

Calf claudication

Answer

Jaundice

Question 9

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

Accepted Answer

Rupture of the bulbar urethra

Answer

Rupture of the membranous urethra

Answer

Pelvic organ blunt trauma

Answer

Rupture of the bladder

Question 10

Staghorn calculus is primarily composed of which substance?

Accepted Answer

Phosphate

Answer

Oxalate

Answer

Uric acid

Answer

Cystine

Urology — MCQs

Urology — MCQs

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