Urology Practice Questions

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.

Q: What is true about carcinoma of the bladder?

Common in smokers. **Explanation:** **Carcinoma of the Bladder** is the most common malignancy of the urinary tract and is a high-yield topic for NEET-PG. **1. Why Option A is Correct:** Smoking is the **most significant risk factor** for bladder cancer, responsible for approximately 50% of cases. Carcinogens in tobacco smoke (such as alpha and beta-naphthylamine) are absorbed into the blood, filtered by the kidneys, and stored in the bladder, where they exert a prolonged "field effect" on the urothelium. **2. Why the other options are incorrect:** * **Option B:** Bladder cancer is significantly **more common in males** (3:1 ratio) than in females. * **Option C:** The most common histological type (90%) is **Transitional Cell Carcinoma (TCC)**, also known as Urothelial Carcinoma. Adenocarcinoma is rare (<2%) and is usually associated with urachal remnants or cystitis glandularis. * **Option D:** The classic and most common presenting symptom is **painless, profuse, intermittent hematuria**. Pain (suprapubic or flank) is usually a late sign indicating advanced disease or obstruction. **Clinical Pearls for NEET-PG:** * **Occupational Risks:** Exposure to aromatic amines (dye, rubber, and leather industries) is the second most common risk factor. * **Schistosomiasis:** Infection with *S. haematobium* is specifically associated with **Squamous Cell Carcinoma** of the bladder. * **Gold Standard Investigation:** Cystoscopy with biopsy. * **Treatment:** Carcinoma in situ (CIS) or superficial tumors (Ta, T1) are managed with **TURBT** followed by intravesical **BCG** therapy. Muscle-invasive disease (T2+) requires **Radical Cystectomy**.

Q: The bladder is most likely to be injured when it is in which state?

Full. **Explanation:** The susceptibility of the urinary bladder to injury is directly related to its anatomical position and its relationship with the bony pelvis. **1. Why "Full" is the correct answer:** When the bladder is **empty**, it is an entirely **pelvic organ**, shielded by the pubic symphysis and the pelvic girdle. As the bladder fills with urine, it distends superiorly and becomes an **extra-pelvic (abdominal) organ**. In this state, the bladder wall becomes thinner and rises above the protective barrier of the pubic bones, coming into direct contact with the anterior abdominal wall. This makes it highly vulnerable to both blunt trauma (e.g., seatbelt injuries or direct blows) and penetrating injuries [1]. A full bladder is also more likely to undergo **intraperitoneal rupture** due to a sudden increase in intra-abdominal pressure [1]. **2. Why other options are incorrect:** * **Empty:** As mentioned, an empty bladder is tucked safely behind the pubic symphysis. It is rarely injured except in cases of severe pelvic fractures where bone fragments directly lacerate the tissue. * **Half full:** While more vulnerable than an empty bladder, it has not yet reached the level of distension or abdominal exposure required to be "most likely" injured compared to a fully distended state. **Clinical Pearls for NEET-PG:** * **Intraperitoneal Rupture:** Usually occurs at the **bladder dome** (the weakest and only part covered by peritoneum) when the bladder is full [1]. It presents with the "Dog ear appearance" on cystography. * **Extraperitoneal Rupture:** Most commonly associated with **pelvic fractures** (e.g., MVA) [1]. * **Gold Standard Investigation:** Retrograde Cystography (showing extravasation of contrast) is the investigation of choice for suspected bladder injury.

Question 1

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 2

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

Accepted Answer

Ureteral obstruction

Answer

Leg edema

Answer

Calf claudication

Answer

Jaundice

Question 3

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 4

Staghorn calculus is primarily composed of which substance?

Accepted Answer

Phosphate

Answer

Oxalate

Answer

Uric acid

Answer

Cystine

Question 5

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 6

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 7

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

Accepted Answer

Suprapubic aspiration

Answer

Urethral catheterization

Answer

Catheter aspiration

Answer

Midstream voiding

Question 8

In females, an ectopic ureter typically opens into which of the following structures?

Accepted Answer

Vagina

Answer

Urethra

Answer

Cervix

Answer

Distal bladder

Question 9

What is true about carcinoma of the bladder?

Accepted Answer

Common in smokers

Answer

Commoner in females than in males

Answer

Mostly adenocarcinoma

Answer

Pain in the suprapubic region is the first symptom

Question 10

The bladder is most likely to be injured when it is in which state?

Accepted Answer

Full

Answer

Half full

Answer

Empty

Answer

None of the above

Urology — MCQs

Urology — MCQs

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