Urology Practice Questions

Q: An elderly male presents with a pathological fracture. Investigations reveal normal serum calcium and phosphorus, but low urine calcium. Serum alkaline phosphatase and acid phosphatase are elevated. Bone biopsy shows osteoblastic metastases. What is the most likely primary tumor site in this patient?

Prostate carcinoma. **Explanation:** The clinical presentation of an elderly male with a pathological fracture and **osteoblastic (sclerotic) metastases** is a classic hallmark of **Prostate Carcinoma**. 1. **Why Prostate Carcinoma is correct:** * **Osteoblastic Lesions:** Unlike most cancers that cause osteolytic (bone-destroying) lesions, prostate cancer typically stimulates osteoblasts, leading to dense, sclerotic bone. * **Biochemical Markers:** Elevated **Acid Phosphatase** (specifically the prostatic acid phosphatase isoenzyme) is a traditional marker for extra-capsular spread of prostate cancer. Elevated **Alkaline Phosphatase (ALP)** reflects increased osteoblastic activity during bone remodeling. * **Calcium Profile:** In osteoblastic metastases, serum calcium is often normal or low (due to calcium being "trapped" in the new bone formation), leading to low urinary calcium. 2. **Why other options are incorrect:** * **Renal Cell Carcinoma (RCC):** Typically presents with purely **osteolytic** (punched-out) lesions that are highly vascular (pulsatile). * **Breast Carcinoma:** While it can be mixed, it is predominantly **osteolytic** in most cases (though it is the most common cause of osteoblastic lesions in *females*). * **Thyroid Carcinoma:** Usually presents with **osteolytic** metastases, often described as "cold" on bone scans but "hot" on iodine scans. **Clinical Pearls for NEET-PG:** * **Most common site of bone metastasis in Prostate CA:** Lumbar spine (via the **Batson venous plexus**, which lacks valves). * **Osteoblastic vs. Osteolytic:** Prostate cancer is the most common cause of osteoblastic lesions in men; Breast cancer is the most common cause of mixed/osteoblastic lesions in women. * **PSA:** While Acid Phosphatase is mentioned here, **Prostate Specific Antigen (PSA)** is the modern gold-standard tumor marker for screening and monitoring.

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: 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.

Q: Which salivary gland neoplasm characteristically spreads perineurally along the cranial nerves?

Adenoid cystic carcinoma. **Explanation:** **Adenoid Cystic Carcinoma (ACC)** is the correct answer because it is notorious for its **neurotropic behavior**. It characteristically exhibits **perineural invasion (PNI)**, where tumor cells track along the nerve sheaths (cranial nerves). This property explains why patients often present with early-onset pain or cranial nerve palsies (e.g., facial nerve palsy in parotid tumors) and why the tumor has a high rate of local recurrence despite wide surgical excision. **Analysis of Incorrect Options:** * **Pleomorphic Adenoma:** This is the most common benign salivary gland tumor. While it has a high rate of recurrence if "enucleated" (due to pseudopods), it does not typically exhibit perineural spread. * **Acinic Cell Carcinoma:** This is a low-grade malignancy with a generally favorable prognosis. It is characterized by cells resembling serous acinar cells but lacks the aggressive neurotropic features of ACC. * **Mucoepidermoid Carcinoma:** This is the most common malignant salivary gland tumor overall. While high-grade variants can be aggressive, perineural spread is not its defining hallmark compared to ACC. **NEET-PG High-Yield Pearls:** * **Histology of ACC:** Look for a "Swiss-cheese" appearance (Cribriform pattern). * **Most Common Site:** While the parotid is the most common site for salivary tumors overall, ACC is the most common malignancy of the **submandibular and minor salivary glands**. * **Prognosis:** ACC is known for a "relentless" course; it has a good 5-year survival but a very poor 15-20 year survival due to late distant metastasis (most commonly to the **lungs** via hematogenous spread). * **Clinical Sign:** Any salivary mass associated with nerve palsy should immediately raise suspicion for Adenoid Cystic Carcinoma.

Q: What is the most reliable method for obtaining a urine specimen?

Suprapubic aspiration. **Explanation:** The gold standard and most reliable method for obtaining a sterile urine specimen is **Suprapubic Aspiration (SPA)**. This technique involves direct needle puncture of the bladder through the abdominal wall, bypassing the entire lower urinary tract. **Why Suprapubic Aspiration is the Correct Answer:** The primary goal of a "reliable" specimen is to avoid contamination from the distal urethra, perineum, or vagina. Since the bladder is normally sterile, any organism found via SPA is considered clinically significant (pathogenic). It eliminates the risk of "false positives" caused by normal skin flora or urethral commensals. **Analysis of Incorrect Options:** * **Urethral Catheterization:** While more reliable than voided samples, the catheter can still push bacteria from the distal urethra into the bladder during insertion, potentially contaminating the sample. * **Catheter Aspiration:** This refers to taking a sample from an indwelling catheter. These samples are often colonized by biofilms and do not accurately reflect an acute bladder infection. * **Midstream Voiding (MSU):** This is the most common clinical method but the least reliable. Despite "cleansing" and catching the middle flow, it is frequently contaminated by periurethral and vaginal flora. **High-Yield Clinical Pearls for NEET-PG:** * **Indications for SPA:** Primarily used in neonates, infants, or patients where non-invasive collection is impossible or results are ambiguous. * **Colony Count Significance:** In an MSU sample, **>10⁵ CFU/ml** (Kass criteria) indicates UTI. However, in a **Suprapubic Aspiration**, even **10² CFU/ml** or the presence of any Gram-negative bacilli is diagnostic of an infection. * **Prerequisite:** SPA should only be performed when the bladder is full (palpable or confirmed via ultrasound) to avoid bowel injury.

Question 1

An elderly male presents with a pathological fracture. Investigations reveal normal serum calcium and phosphorus, but low urine calcium. Serum alkaline phosphatase and acid phosphatase are elevated. Bone biopsy shows osteoblastic metastases. What is the most likely primary tumor site in this patient?

Accepted Answer

Prostate carcinoma

Answer

Renal cell carcinoma

Answer

Breast carcinoma

Answer

Thyroid carcinoma

Question 2

Which of the following statements about detrusor instability is false?

Accepted Answer

Genuine stress incontinence (GSI) is indistinguishable from detrusor instability.

Answer

50% of men with bladder outflow obstruction have detrusor instability.

Answer

Patients with neurogenic bladder may have detrusor instability.

Answer

Urodynamic studies are essential for evaluation of detrusor instability.

Question 3

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

Accepted Answer

Urinary stones

Answer

Bile stones

Answer

Premalignant lesions

Answer

Bacterial infections

Question 4

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 5

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

Accepted Answer

Ureteral obstruction

Answer

Leg edema

Answer

Calf claudication

Answer

Jaundice

Question 6

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 7

Staghorn calculus is primarily composed of which substance?

Accepted Answer

Phosphate

Answer

Oxalate

Answer

Uric acid

Answer

Cystine

Question 8

What is the commonest cause of periumbilical pain occurring 30 minutes after a TURP procedure performed under spinal anesthesia with Bupivacaine?

Accepted Answer

Perforation of the bladder

Answer

Meteorism

Answer

Recovery from bupivacaine anesthesia

Answer

Mesenteric artery ischemia

Question 9

Which salivary gland neoplasm characteristically spreads perineurally along the cranial nerves?

Accepted Answer

Adenoid cystic carcinoma

Answer

Pleomorphic adenoma

Answer

Acinic cell carcinoma

Answer

Mucoepidermoid carcinoma

Question 10

What is the most reliable method for obtaining a urine specimen?

Accepted Answer

Suprapubic aspiration

Answer

Urethral catheterization

Answer

Catheter aspiration

Answer

Midstream voiding

Urology — MCQs

Urology — MCQs

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