Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 891: PSA is measured in which units?

A. gm/ml
B. mg/ml
C. mcg/ml
D. ng/ml (Correct Answer)

Explanation: **Explanation:** **Prostate-Specific Antigen (PSA)** is a glycoprotein enzyme secreted by the epithelial cells of the prostate gland. In clinical practice, PSA is a vital biomarker used for the screening, diagnosis, and monitoring of prostate cancer and other prostatic conditions. **1. Why ng/ml is the correct answer:** PSA circulates in the blood in very minute quantities. The standard unit of measurement for PSA is **nanograms per milliliter (ng/ml)**. In a healthy individual with a normal-sized prostate, the typical "normal" reference range is generally considered to be **0–4 ng/ml**. Because the concentration is so low, using larger units would result in impractical decimal values. **2. Why other options are incorrect:** * **gm/ml (Grams), mg/ml (Milligrams), and mcg/ml (Micrograms):** These units represent much higher concentrations (1 mg is $10^6$ times larger than 1 ng). Measuring PSA in these units would yield values like 0.000000004 gm/ml, which is clinically unusable. These units are typically reserved for serum proteins (like albumin in gm/dl) or drug concentrations, rather than trace tumor markers. **3. Clinical Pearls for NEET-PG:** * **Age-Specific PSA:** PSA levels naturally rise with age due to increasing prostate volume (e.g., <2.5 ng/ml for age 40–49; <6.5 ng/ml for age 70–79). * **PSA Velocity:** A rise of **>0.75 ng/ml per year** is highly suspicious for malignancy, even if the total PSA is <4 ng/ml. * **Free/Total PSA Ratio:** A ratio **<10–15%** suggests a higher probability of prostate cancer, while a higher ratio (>25%) suggests BPH. * **Causes of Elevated PSA:** Apart from Prostate Cancer, PSA can be elevated in BPH, Prostatitis, Urinary Tract Infections (UTI), and following procedures like DRE, cystoscopy, or prostatic biopsy.

Question 892: What is the incidence of an absent kidney (renal agenesis)?

A. 1 in 200 individuals
B. 1 in 700 individuals
C. 1 in 1400 individuals (Correct Answer)
D. 1 in 5000 individuals

Explanation: **Explanation:** **Unilateral Renal Agenesis (URA)** occurs due to the failure of the ureteric bud to develop or its failure to contact the metanephric blastema during embryogenesis. 1. **Why Option C is Correct:** Large-scale autopsy and radiological studies have established that the incidence of a solitary functioning kidney due to agenesis is approximately **1 in 1400 individuals**. It is more common in males and more frequently involves the left side. While often asymptomatic, the remaining kidney typically undergoes compensatory hypertrophy to maintain normal renal function. 2. **Analysis of Incorrect Options:** * **Option A (1 in 200):** This is too frequent for agenesis; however, it is closer to the incidence of **Horseshoe Kidney** (approx. 1 in 400–600). * **Option B (1 in 700):** This is a common distractor but does not align with standard urological epidemiological data for agenesis. * **Option D (1 in 5000):** This is the approximate incidence of **Bilateral Renal Agenesis**, which is incompatible with life (Potter’s Sequence) and much rarer than the unilateral form. **High-Yield Clinical Pearls for NEET-PG:** * **Associated Anomalies:** In males, URA is often associated with the absence of the ipsilateral vas deferens and seminal vesicle. In females, it is associated with **Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome** (müllerian duct anomalies). * **VATER/VACTERL:** Renal agenesis is a component of this association. * **Diagnosis:** Often an incidental finding on ultrasound. The "lying down adrenal sign" (elongated adrenal gland) is seen on imaging because the kidney is not present to shape it. * **Prognosis:** Most patients have a normal lifespan, but they are at a slightly higher risk for hypertension and proteinuria later in life due to hyperfiltration.

Question 893: Characteristic features of benign prostatic hypertrophy include all of the following except:

A. Increased trabeculations in the bladder
B. Enlargement of the lateral lobes of the prostate (Correct Answer)
C. 'J' shaped or 'fish hook' distal ureters
D. Bilateral hydronephrosis

Explanation: ### Explanation **Correct Option: B. Enlargement of the lateral lobes of the prostate** In Benign Prostatic Hyperplasia (BPH), the pathological process involves the formation of large, discrete nodules in the **periurethral transition zone** of the prostate. While the lateral and median lobes are commonly involved in the clinical presentation of BPH, the statement is technically the "except" because BPH is fundamentally a disease of the **Transition Zone**, whereas prostatic adenocarcinoma typically arises in the **Peripheral Zone**. In the context of standard surgical teaching (McNeal’s zones), the transition zone is the hallmark of BPH. **Analysis of Incorrect Options:** * **A. Increased trabeculations in the bladder:** Chronic bladder outlet obstruction (BOO) caused by BPH leads to detrusor muscle hypertrophy. This results in the formation of coarse bundles called **trabeculations**, which can progress to **cellules** and **diverticula**. * **C. 'J' shaped or 'fish hook' distal ureters:** As the prostate enlarges, it pushes the base of the bladder upward. This elevates the trigone and the ureterovesical junction, causing the distal ureters to curve upward and then downward, creating a characteristic **"Fish-hook" or "J-shaped" appearance** on Intravenous Urogram (IVU). * **D. Bilateral hydronephrosis:** Persistent high-pressure retention and vesicoureteral reflux (due to the distortion of the ureteric orifices) eventually lead to bilateral hydroureteronephrosis and can result in post-renal azotemia. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for BPH:** Transition Zone. * **Most common site for Prostate Cancer:** Peripheral Zone. * **First symptom of BPH:** Usually nocturia (due to decreased bladder compliance). * **Gold Standard Investigation:** Uroflowmetry (Qmax <10 ml/sec is significant). * **Surgical Gold Standard:** TURP (Transurethral Resection of the Prostate). * **Median Lobe Enlargement:** Can act as a "ball-valve" mechanism, causing significant obstruction even if the overall prostate size is small.

Question 894: Hyperbaric oxygen is used in which of the following conditions?

A. Carbon monoxide poisoning (Correct Answer)
B. Ventilation failure
C. Anaerobic infection
D. Gangrene

Explanation: **Explanation:** **Hyperbaric Oxygen Therapy (HBOT)** involves breathing 100% oxygen at pressures greater than 1 atmosphere absolute (ATA). **Why Option A is Correct:** In **Carbon Monoxide (CO) poisoning**, CO binds to hemoglobin with an affinity 200–250 times greater than oxygen, forming carboxyhemoglobin and causing a leftward shift of the dissociation curve (tissue hypoxia). HBOT is the definitive treatment because it drastically reduces the half-life of carboxyhemoglobin (from ~300 minutes on room air to ~20 minutes at 3 ATA) and increases the amount of dissolved oxygen in the plasma, bypassing the blocked hemoglobin. **Why Other Options are Incorrect:** * **B. Ventilation Failure:** This is a mechanical or neuromuscular issue (e.g., COPD exacerbation or Myasthenia Gravis). It requires mechanical ventilation or BIPAP to clear $CO_2$, not high-pressure oxygen, which could actually worsen hypercapnia. * **C & D. Anaerobic Infection/Gangrene:** While HBOT is an *adjunct* treatment for Gas Gangrene (Clostridial myonecrosis) and certain necrotizing infections, it is not the primary or "most characteristic" use compared to the emergency indication of CO poisoning in the context of standard surgical MCQs. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindication:** Untreated Tension Pneumothorax. * **Most Common Side Effect:** Middle ear barotrauma (Eustachian tube dysfunction). * **Other Indications:** Decompression sickness ("the bends"), Air/Gas embolism, refractory Osteomyelitis, and delayed radiation tissue injury (e.g., radiation cystitis). * **Mechanism in Wound Healing:** It stimulates angiogenesis and fibroblast proliferation in hypoxic tissues.

Question 895: A 49-year-old male with a 35-pack-year smoking history presents with a painless left scrotal mass. Examination revealed microscopic hematuria and normal alpha-fetoprotein (AFP) and lactate dehydrogenase (LDH) levels. What is the most probable cause of the scrotal mass?

A. Seminoma
B. Renal cell carcinoma (Correct Answer)
C. Epididymitis
D. Carcinoma of the lung

Explanation: ### Explanation The correct answer is **Renal Cell Carcinoma (RCC)**. **1. Why Renal Cell Carcinoma is correct:** The clinical presentation of a **painless scrotal mass** (specifically a varicocele) associated with **microscopic hematuria** and a significant **smoking history** is a classic "red flag" for Renal Cell Carcinoma. * **The Anatomical Link:** A left-sided varicocele occurs in RCC when the tumor invades the renal vein or causes extrinsic compression, obstructing the drainage of the **left gonadal (testicular) vein**, which drains directly into the left renal vein at a 90-degree angle. * **Clues in the stem:** Hematuria is the most common presenting sign of RCC. The normal AFP and LDH levels help rule out primary germ cell tumors. **2. Why other options are incorrect:** * **Seminoma:** While it presents as a painless scrotal mass, it typically presents in younger men (30–40s) and would not explain the microscopic hematuria. * **Epididymitis:** This usually presents with acute scrotal pain, fever, and signs of inflammation (Prehn’s sign positive), rather than a painless mass and hematuria. * **Carcinoma of the lung:** While the patient is a smoker, lung cancer does not typically present with a scrotal mass or hematuria unless there is widespread metastasis, which is less likely than a primary renal pathology in this context. **3. Clinical Pearls for NEET-PG:** * **Left vs. Right Varicocele:** A **new-onset left varicocele** in an older male that does not empty when lying supine must be investigated for RCC. A **right-sided varicocele** is even more concerning as it is rarer (the right gonadal vein drains directly into the IVC) and often indicates a retroperitoneal mass or IVC obstruction. * **Classic Triad of RCC:** Hematuria, flank pain, and a palpable mass (seen in only 10% of cases). * **Stauffer Syndrome:** A paraneoplastic syndrome of RCC involving non-metastatic hepatic dysfunction.

Question 896: Dukes classification is used for which of the following carcinomas?

A. Pancreas carcinoma
B. Gastric carcinoma
C. Urinary bladder carcinoma
D. Colo-rectal carcinoma (Correct Answer)

Explanation: **Explanation:** **Dukes classification** is the classic staging system used for **Colo-rectal carcinoma**. Introduced by Cuthbert Dukes in 1932, it categorizes tumors based on the depth of invasion and lymph node involvement, which directly correlates with the 5-year survival rate. * **Dukes A:** Tumor limited to the wall (mucosa/submucosa/muscularis propria); lymph nodes negative. * **Dukes B:** Tumor extends through the muscularis propria into the serosa or pericolic fat; lymph nodes negative. * **Dukes C:** Any depth of wall involvement with positive regional lymph nodes. * **Dukes D:** Distant metastasis (added later by Astler-Coller). **Why other options are incorrect:** * **Pancreas carcinoma:** Staged using the **TNM system** (AJCC). The Whipple procedure is the standard surgery for resectable head tumors. * **Gastric carcinoma:** Staged using the **TNM system** or the **Japanese Classification of Gastric Carcinoma**. * **Urinary bladder carcinoma:** Staged using the **TNM system** and the **Jewett-Strong-Marshall** staging system (which focuses on depth of bladder wall invasion). **High-Yield Clinical Pearls for NEET-PG:** * While Dukes is historically significant, the **TNM staging** is currently the gold standard for most solid tumors, including colorectal cancer. * The **Astler-Coller modification** is a common variation of Dukes staging often tested in exams. * For **Urinary Bladder Cancer**, remember that the involvement of the **muscularis propria (T2)** is the critical "tipping point" for deciding between bladder-sparing therapy and radical cystectomy.

Question 897: What is the drug of choice for renal colic?

A. Methadone
B. Pentazocine
C. Diclofenac (Correct Answer)
D. Piroxicam

Explanation: **Explanation:** The management of renal colic focuses on relieving pain and reducing ureteral smooth muscle spasms. **Why Diclofenac is the Correct Answer:** Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), specifically **Diclofenac**, are the **first-line drug of choice** for acute renal colic. The underlying pathophysiology of renal colic involves an increase in intrapelvic pressure due to obstruction, which triggers the release of **Prostaglandins**. Prostaglandins cause further vasodilation (increasing glomerular filtration and pressure) and direct ureteral smooth muscle contraction. Diclofenac inhibits the enzyme cyclooxygenase (COX), thereby blocking prostaglandin synthesis. This reduces ureteral edema, lowers intrarenal pressure, and provides superior analgesia compared to opioids in this specific clinical setting. **Analysis of Incorrect Options:** * **Methadone (A):** A long-acting synthetic opioid primarily used for chronic pain management and opioid detoxification. It is not indicated for acute renal colic. * **Pentazocine (B):** An opioid agonist-antagonist. While it provides analgesia, opioids can cause unwanted side effects like nausea and, theoretically, may increase ureteral pressure or cause spasm of the Sphincter of Oddi. * **Piroxicam (D):** Although an NSAID, it has a slower onset of action and a longer half-life, making it less suitable for the rapid relief required in acute renal colic compared to Diclofenac. **Clinical Pearls for NEET-PG:** * **Route of Administration:** Intramuscular (IM) or intravenous (IV) Diclofenac is preferred for rapid onset, though rectal suppositories are also highly effective. * **Second-line:** If NSAIDs are contraindicated (e.g., renal failure, peptic ulcer disease) or ineffective, opioids (like Morphine or Pethidine) are used. * **Medical Expulsive Therapy (MET):** For stones <10mm, **Tamsulosin** (Alpha-1 blocker) is the drug of choice to facilitate stone passage.

Question 898: Which chromosome carries the gene responsible for Familial Adenomatous Polyposis (FAP)?

A. Chromosome 5 (Correct Answer)
B. Chromosome 8
C. Chromosome 15
D. Chromosome X

Explanation: **Explanation:** **Correct Option: A (Chromosome 5)** Familial Adenomatous Polyposis (FAP) is an autosomal dominant condition caused by a germline mutation in the **APC (Adenomatous Polyposis Coli)** gene. This gene is located on the long arm of **Chromosome 5 (5q21)**. The APC gene is a tumor suppressor gene that regulates the Wnt signaling pathway; its loss leads to the development of hundreds to thousands of adenomatous colorectal polyps, with a near 100% risk of progression to colorectal cancer if left untreated. **Incorrect Options:** * **Chromosome 8:** Associated with the **MYC** oncogene (often involved in Burkitt lymphoma) and the **EXT1** gene (Hereditary Multiple Exostoses). * **Chromosome 15:** Associated with **Fibrillin-1 (FBN1)** gene mutations (Marfan Syndrome) and the **SNRPN/UBE3A** genes (Prader-Willi and Angelman syndromes). * **Chromosome X:** Associated with X-linked conditions like Hemophilia, Duchenne Muscular Dystrophy, and Alport Syndrome. **High-Yield Clinical Pearls for NEET-PG:** 1. **Gardner Syndrome:** A variant of FAP characterized by the triad of colonic polyposis, **osteomas** (usually of the mandible/skull), and **soft tissue tumors** (desmoid tumors, sebaceous cysts). 2. **Turcot Syndrome:** Association of FAP with CNS tumors (specifically **Medulloblastoma**). Note: Turcot associated with HNPCC/Lynch syndrome typically presents with Glioblastoma. 3. **Screening:** For FAP, screening via flexible sigmoidoscopy/colonoscopy should begin at age **10–12 years**. 4. **Surgery:** The gold standard treatment is **Proctocolectomy with Ileal Pouch-Anal Anastomosis (IPAA)**.

Question 899: On exertion, in which condition does the urine stream increase?

A. Prostate enlargement
B. Marion's disease
C. Posterior urethral valves
D. Urethral stricture (Correct Answer)

Explanation: ### Explanation In **Urethral Stricture**, the pathology is a fixed, anatomical narrowing of the urethral lumen due to scarring (fibrosis). When a patient with a stricture exerts themselves (e.g., using the Valsalva maneuver or abdominal straining), the intra-abdominal pressure increases. This pressure is transmitted directly to the bladder, increasing the intravesical pressure. Because the stricture is a **passive, rigid resistance**, the increased driving force from the bladder successfully pushes more urine through the narrow opening, thereby **increasing the force and flow of the urine stream**. **Why the other options are incorrect:** * **Prostate Enlargement (BPH):** This is a "dynamic" obstruction. Straining increases pressure on the pelvic floor, which can further compress the prostatic urethra or cause the enlarged median lobe to act as a ball-valve, often worsening the obstruction rather than improving the stream. * **Marion’s Disease (Bladder Neck Obstruction):** This involves hypertrophy or lack of relaxation of the internal sphincter. Like BPH, it acts as a functional/dynamic valve where straining does not significantly improve the flow and may worsen the dysfunction. * **Posterior Urethral Valves (PUV):** These are mucosal folds in the distal prostatic urethra that act as **one-way valves**. Increased abdominal pressure pushes the valve leaflets together, further sealing the lumen and worsening the obstruction. ### Clinical Pearls for NEET-PG: * **Urethral Stricture:** Most common site is the **bulbar urethra** (post-traumatic or idiopathic). The gold standard investigation is **Retrograde Urethrogram (RGU)**. * **Flow Rate:** A peak flow rate (**Qmax**) of **<10 mL/s** is highly suggestive of significant outflow obstruction. * **Key Distinction:** If the stream improves with straining, think **Stricture**; if it worsens or remains poor despite straining, think **Prostatic or Valve obstruction**.

Question 900: What is the minimum amount of gastrointestinal bleed required to cause melena?

A. 10 ml
B. 40 ml
C. 60 ml (Correct Answer)
D. 115 ml

Explanation: **Explanation:** **Melena** is defined as the passage of black, tarry, foul-smelling stools, resulting from the degradation of hemoglobin into hematin by intestinal bacteria. This process typically occurs when blood remains in the gastrointestinal tract for at least **8 to 14 hours**. 1. **Why 60 ml is correct:** Clinical studies and standard surgical textbooks (such as Bailey & Love and Harrison’s) establish that a minimum of **60 ml** of blood in the upper GI tract is required to produce a single episode of melena. While some sources suggest a range (50–100 ml), **60 ml** is the classic high-yield figure tested in competitive exams. 2. **Why other options are incorrect:** * **10 ml:** This volume is too small to cause visible changes in stool color. However, it is sufficient to produce a positive **Fecal Occult Blood Test (FOBT)**. * **40 ml:** While approaching the threshold, this amount is generally insufficient to consistently alter stool consistency and color to the "tarry" state characteristic of melena. * **115 ml:** This volume will certainly cause melena, but it is not the *minimum* required amount. **Clinical Pearls for NEET-PG:** * **Site of Bleed:** Melena usually indicates an **Upper GI bleed** (proximal to the Ligament of Treitz). However, it can occur with lesions in the small intestine or right colon if transit time is slow. * **Hematochezia:** Usually signifies a Lower GI bleed, but can occur in massive Upper GI bleeds (>1000 ml) due to rapid transit. * **Duration:** Blood must stay in the gut for at least **8 hours** to turn black. * **False Melena:** Ingestion of iron supplements, bismuth, or charcoal can mimic melena but will lack the characteristic "tarry" consistency and foul odor.

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Bladder Cancer

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Renal Cell Carcinoma

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Testicular Tumors

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Urinary Incontinence

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