Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 161: What is the best screening marker for prostate cancer?

A. Alpha-fetoprotein
B. Prostate-specific antigen (Correct Answer)
C. CA 19-9
D. CA 125

Explanation: **Explanation:** **Prostate-specific antigen (PSA)** is the correct answer because it is the most widely used and effective screening marker for prostate cancer. PSA is a serine protease enzyme produced by the ductal and acinar epithelium of the prostate gland. While it is organ-specific, it is not cancer-specific (levels can rise in BPH, prostatitis, or after instrumentation). However, a threshold of **>4 ng/mL** is traditionally used to prompt further investigation, such as a digital rectal examination (DRE) and biopsy. **Analysis of Incorrect Options:** * **Alpha-fetoprotein (AFP):** A marker used for Hepatocellular Carcinoma (HCC) and non-seminomatous germ cell tumors (NSGCT) of the testis (e.g., Yolk sac tumor). * **CA 19-9:** Primarily used as a tumor marker for pancreatic adenocarcinoma and some hepatobiliary cancers. * **CA 125:** The standard marker for monitoring and screening (in high-risk cases) epithelial ovarian cancer. **High-Yield Clinical Pearls for NEET-PG:** * **PSA Velocity:** An increase in PSA level of **>0.75 ng/mL per year** is highly suggestive of malignancy, even if the absolute value is <4 ng/mL. * **Free-to-Total PSA Ratio:** A lower ratio (typically **<10-15%**) increases the suspicion of prostate cancer, whereas a higher ratio is seen in BPH. * **Age-Specific PSA:** Normal ranges increase with age due to increasing prostate volume (e.g., <2.5 for 40-49 years; <6.5 for 70-79 years). * **PSA Density:** Calculated as PSA level divided by prostate volume (measured via TRUS); a value **>0.15** is suspicious.

Question 162: Which is the most common risk factor for Renal Cell Carcinoma (RCC)?

A. Urinary tract infection
B. Renal calculi
C. Smoking (Correct Answer)
D. Hypertension

Explanation: **Explanation:** **Renal Cell Carcinoma (RCC)**, specifically the clear cell subtype, is the most common primary renal malignancy. Among the various modifiable risk factors, **Smoking** is considered the most significant and established risk factor. 1. **Why Smoking is Correct:** Tobacco use has a dose-dependent relationship with RCC. It is estimated that smoking doubles the risk of developing renal cancer. The mechanism involves the systemic absorption of carcinogens (like polycyclic aromatic hydrocarbons) which are filtered by the kidneys, leading to chronic urothelial irritation and DNA damage. 2. **Why Incorrect Options are Wrong:** * **Urinary Tract Infection (UTI) & Renal Calculi:** While chronic irritation from stones or infections is a known risk factor for **Squamous Cell Carcinoma** of the renal pelvis or bladder, they are not primary drivers for RCC (which arises from the tubular epithelium). * **Hypertension:** Hypertension is indeed an independent risk factor for RCC, but statistically, smoking remains the more prevalent and potent contributor in epidemiological studies. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Subtype:** Clear Cell RCC (arises from the **Proximal Convoluted Tubule**). * **Genetic Association:** Deletion of the **VHL gene** on Chromosome 3p. * **Classic Triad:** Hematuria, Flank pain, and Palpable mass (seen in only 10% of cases; usually signifies advanced disease). * **Other Risk Factors:** Obesity (especially in women), Occupational exposure to Cadmium/Asbestos, and Acquired Cystic Kidney Disease (ACKD) in dialysis patients. * **Paraneoplastic Syndromes:** RCC is the "Internist's Tumor" because it frequently produces EPO (Polycythemia), PTHrP (Hypercalcemia), and Renin (Hypertension).

Question 163: Carcinoembryonic antigen (CEA) is increased in all of the following conditions except:

A. Lung cancer
B. Breast cancer
C. Colon cancer
D. Osteogenic sarcoma (Correct Answer)

Explanation: **Explanation:** Carcinoembryonic antigen (CEA) is a high-molecular-weight glycoprotein that belongs to the immunoglobulin superfamily. It is primarily an **oncofetal antigen**, normally produced during fetal development by the gastrointestinal tract, liver, and pancreas, but its levels become negligible after birth. **1. Why Osteogenic Sarcoma is the Correct Answer:** CEA is a marker for **epithelial tumors** (carcinomas). **Osteogenic sarcoma** is a primary malignant tumor of the bone derived from mesenchymal stem cells (a sarcoma). Since it is not of epithelial origin, it does not produce CEA. The characteristic marker for Osteogenic sarcoma is **Alkaline Phosphatase (ALP)**, which correlates with osteoblastic activity and tumor burden. **2. Analysis of Incorrect Options:** * **Colon Cancer:** CEA is the classic tumor marker for colorectal carcinoma. While not used for screening (due to low sensitivity in early stages), it is the gold standard for **monitoring recurrence** and response to treatment. * **Lung Cancer:** CEA levels are frequently elevated in non-small cell lung cancer (NSCLC), particularly **adenocarcinoma**. * **Breast Cancer:** CEA, along with CA 15-3, is often elevated in advanced or metastatic breast cancer and is used to monitor therapeutic efficacy. **High-Yield Clinical Pearls for NEET-PG:** * **Non-Neoplastic elevations of CEA:** Heavy smoking (most common non-cancer cause), cirrhosis, pancreatitis, ulcerative colitis, and COPD. * **Main Clinical Use:** CEA is **not** for diagnosis/screening; it is for **prognosis and longitudinal follow-up** to detect recurrence. * **Rule of Thumb:** If a question asks about CEA, look for an "Epithelial vs. Mesenchymal" distinction. Sarcomas and Lymphomas generally do not raise CEA.

Question 164: The Gail model of risk assessment is used for which of the following conditions?

A. Carcinoma of the stomach
B. Carcinoma of the esophagus
C. Carcinoma of the breast (Correct Answer)
D. Carcinoma of the prostate

Explanation: **Explanation:** The **Gail Model** (also known as the Breast Cancer Risk Assessment Tool) is a statistical model used to estimate a woman's risk of developing invasive breast cancer over the next 5 years and over her lifetime (up to age 90). It is the most widely used risk assessment tool in clinical practice for breast cancer. **Why Option C is correct:** The model incorporates specific personal and family history factors to calculate risk, including: * Current age * Age at menarche * Age at first live birth * Number of first-degree relatives with breast cancer * Number of previous benign breast biopsies * Presence of atypical hyperplasia on biopsy **Why other options are incorrect:** * **Carcinoma of the stomach (A) and Esophagus (B):** These do not use the Gail model. Risk assessment for GI malignancies typically relies on endoscopic surveillance (e.g., for Barrett's esophagus) or screening for *H. pylori* and genetic syndromes like HDGC (CDH1 mutation). * **Carcinoma of the prostate (D):** Risk assessment for prostate cancer primarily utilizes the **PSA (Prostate-Specific Antigen)** levels, Digital Rectal Examination (DRE), and tools like the **Partin Tables** or **MSKCC Nomograms** to predict pathological stage and prognosis. **High-Yield Clinical Pearls for NEET-PG:** * **Cut-off point:** A 5-year risk score of **≥ 1.67%** is considered "high risk" and is the threshold used to discuss chemoprevention (e.g., Tamoxifen or Raloxifene). * **Limitation:** The Gail model **underestimates** risk in women with hereditary syndromes like BRCA1/2 mutations. For these patients, the **Claus model** or **BRCAPRO** is preferred. * **BI-RADS:** Remember that BI-RADS is for *radiological reporting*, while Gail is for *clinical risk assessment*.

Question 165: What is the normal Central Venous Pressure (CVP)?

A. 0-3 cm H2O
B. 2-6 cm H2O (Correct Answer)
C. 12-15 cm H2O
D. >20 cm H2O

Explanation: **Explanation:** **Central Venous Pressure (CVP)** is the pressure measured in the superior vena cava near the right atrium. It serves as a clinical surrogate for right ventricular end-diastolic pressure and is a key indicator of intravascular volume status and right heart function. 1. **Why Option B is Correct:** The physiological range for CVP in a healthy, spontaneously breathing individual is **2–6 mmHg** (or approximately 5–10 cm H₂O). In the context of standard medical examinations like NEET-PG, **2–6 mmHg** is the most frequently cited "normal" range. It represents a state where there is adequate venous return without fluid overload or right heart failure. 2. **Analysis of Incorrect Options:** * **Option A (0-3 cm H₂O):** This range is too low. A CVP consistently below 2 mmHg typically indicates **hypovolemia** (dehydration or hemorrhage) or excessive peripheral vasodilation (e.g., distributive shock). * **Option C (12-15 cm H₂O):** This is elevated. High CVP suggests **hypervolemia** (fluid overload), right-sided heart failure, cardiac tamponade, or pulmonary hypertension. * **Option D (>20 cm H₂O):** This represents severe pathological elevation, often seen in acute heart failure or severe tension pneumothorax, and carries a risk of systemic venous congestion. **High-Yield Clinical Pearls for NEET-PG:** * **Reference Point:** The zero level for CVP measurement is the **phlebostatic axis** (4th intercostal space, mid-axillary line). * **Conversion:** Remember that **1 mmHg = 1.36 cm H₂O**. If the question asks for cm H₂O, the normal range is roughly **5–10 cm H₂O**. * **Waveforms:** The CVP waveform has three positive waves: **'a'** (atrial contraction), **'c'** (tricuspid bulging), and **'v'** (venous filling). * **Clinical Use:** In urological surgery (like TURP or major renal surgery), CVP monitoring is vital to prevent fluid overload and monitor for "TURP Syndrome."

Question 166: Secondary vesical calculus refers to stones formed due to which of the following?

A. Hypercalciuria
B. Injury
C. Infection (Correct Answer)
D. Migrating from kidney

Explanation: **Explanation:** Vesical calculi (bladder stones) are classified into two types based on their site of origin and etiology: **Primary** and **Secondary**. **Why C is Correct:** **Secondary vesical calculi** are stones that form *de novo* within the bladder due to pre-existing bladder pathology. The most common causes are **urinary stasis** (e.g., Benign Prostatic Hyperplasia, urethral stricture) and **chronic urinary tract infection (UTI)**. Infections caused by urea-splitting organisms (like *Proteus* or *Klebsiella*) increase urinary pH, leading to the precipitation of magnesium ammonium phosphate, forming **struvite or triple phosphate stones**. **Why Other Options are Incorrect:** * **A. Hypercalciuria:** This is a metabolic abnormality that typically leads to the formation of **Primary** calculi (stones forming in sterile, non-obstructed urine). * **B. Injury:** While a foreign body (like a non-absorbable suture or fragment from an injury) can act as a nidus for a stone, "Injury" itself is not the standard definition for secondary stones. * **D. Migrating from kidney:** These are termed **Migratory calculi**. Although they are found in the bladder, they originated in the renal pelvis and are not considered "secondary" bladder stones in the classic surgical classification. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Vesical Calculi:** Usually seen in children; often composed of ammonium acid urate or calcium oxalate; associated with low-protein, low-phosphate diets. * **Secondary Vesical Calculi:** Usually seen in adult males; associated with **BPH** (most common cause of stasis). * **Classic Symptom:** "Interruption of urinary stream" or "Pain at the end of micturition" referred to the tip of the penis (due to the stone hitting the sensitive trigone). * **Investigation of Choice:** Non-contrast CT (NCCT) is most sensitive, but Ultrasound is often the initial screening tool.

Question 167: What is the best treatment for meningioma with a low recurrence rate?

A. Tumor excision with cyst of dura mater removal (Correct Answer)
B. Excision surgery followed by radiotherapy
C. Chemotherapy
D. Preoperative embolization followed by excision surgery

Explanation: **Explanation:** The primary goal in the surgical management of meningiomas is achieving a **Simpson Grade I resection**. Meningiomas arise from the arachnoid cap cells of the leptomeninges and often involve the overlying dura mater (the "dural tail"). **Why Option A is Correct:** The recurrence rate of meningioma is directly proportional to the extent of resection. **Tumor excision along with the removal of the involved dura mater and any affected bone** (Simpson Grade I) offers the lowest recurrence rate (approximately 7-9%). Leaving the dural attachment intact (Simpson Grade II) significantly increases the risk of recurrence because microscopic tumor cells often infiltrate the dural base. **Analysis of Incorrect Options:** * **Option B:** Radiotherapy is generally reserved for malignant (Grade III) meningiomas, subtotal resections (Simpson Grade IV/V), or recurrent cases. It is not the primary treatment for achieving a low recurrence rate in a resectable tumor. * **Option C:** Meningiomas are largely chemo-resistant. Chemotherapy is a last resort for aggressive tumors that have failed surgery and radiation. * **Option D:** While preoperative embolization can reduce intraoperative blood loss in highly vascular tumors (like convexity or parasagittal meningiomas), it does not inherently lower the long-term recurrence rate; only the completeness of the dural resection does. **NEET-PG High-Yield Pearls:** * **Simpson Grading:** It is the most important predictor of recurrence. Grade I is total removal including dura and bone; Grade V is simple decompression/biopsy. * **Psammoma Bodies:** These are characteristic laminated calcifications seen on histology (common in transitional and psammomatous types). * **Imaging:** "Dural Tail Sign" on contrast-enhanced MRI is classic. * **Association:** Meningiomas are associated with **NF-2** (often multiple) and are more common in females due to progesterone receptors.

Question 168: Which type of bladder rupture is most commonly associated with pelvic fracture?

A. Extraperitoneal (Correct Answer)
B. Intraperitoneal
C. Extraperitoneal and Intraperitoneal
D. None of the above

Explanation: **Explanation:** Bladder rupture is a common consequence of high-energy trauma. The classification depends on the mechanism of injury and the anatomical location of the tear relative to the peritoneal reflection. **1. Why Extraperitoneal is correct:** Extraperitoneal rupture is the most common type of bladder injury, accounting for approximately **60–80% of cases**. It is almost exclusively associated with **pelvic fractures** (seen in over 90% of extraperitoneal ruptures). The mechanism involves either direct perforation by a bony spicule from the pubic rami or the "burst effect" caused by the shearing forces of the pelvic ring disruption. The rupture typically occurs at the anterolateral aspect of the bladder neck. **2. Why other options are incorrect:** * **Intraperitoneal Rupture:** This occurs in about 20–40% of cases. It is typically caused by a direct blow to the lower abdomen when the **bladder is full (distended)**. The sudden rise in intravesical pressure causes the bladder to burst at its weakest point—the **dome** (superior aspect), which is covered by peritoneum. It is less commonly associated with pelvic fractures compared to the extraperitoneal type. * **Combined (Extra- and Intraperitoneal):** This occurs in less than 10% of cases and usually involves high-velocity, complex pelvic trauma. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Retrograde Cystography (showing "flame-shaped" contrast extravasation in extraperitoneal and "bowel loop outlining" in intraperitoneal). * **Management:** * **Extraperitoneal:** Usually managed **conservatively** with a Foley catheter for 10–14 days. * **Intraperitoneal:** Requires **mandatory surgical repair** (laparotomy) because urine in the peritoneal cavity leads to chemical peritonitis and electrolyte imbalances (e.g., hyperkalemia, uremia). * **Triad of Bladder Trauma:** Gross hematuria, suprapubic pain, and inability to void.

Question 169: Nicoldoni sign is also known as?

A. Murray sign
B. Frei sign
C. Darrier sign
D. Branham sign (Correct Answer)

Explanation: **Explanation:** **Nicoldoni sign**, also known as the **Branham sign**, is a classic clinical finding associated with large **Arteriovenous Fistulas (AVFs)**. When digital pressure is applied to the artery proximal to the fistula, or when the fistula itself is compressed, there is a sudden drop in heart rate (bradycardia) and a rise in blood pressure. This occurs because closing the low-resistance shunt increases systemic vascular resistance and stroke volume, triggering a baroreceptor-mediated reflex. **Analysis of Options:** * **Branham sign (Correct):** This is the synonymous term for Nicoldoni sign. It is a vital diagnostic tool for assessing the hemodynamic impact of an AV fistula. * **Murray sign:** This is not a standard surgical or urological eponym. (Note: Joseph Murray was a pioneer in kidney transplantation, but there is no "Murray sign" related to AVFs). * **Frei sign:** This is not a recognized clinical sign. (The *Frei test* was historically used for Lymphogranuloma Venereum). * **Darrier sign:** This is a dermatological sign where rubbing a lesion (in Mastocytosis) leads to wheal and flare formation due to histamine release. **High-Yield Clinical Pearls for NEET-PG:** * **Machinery Murmur:** AV fistulas are characterized by a continuous "bruit" or "thrill" throughout systole and diastole. * **Proximal Dilatation:** The artery proximal to a long-standing AVF often becomes dilated and tortuous. * **Complication:** Large, chronic AVFs can lead to high-output cardiac failure due to increased venous return. * **Urology Link:** While often vascular, AV fistulas can occur in the kidney (Renal AVF) following trauma or percutaneous biopsy, presenting with hematuria and hypertension.

Question 170: A 30-year-old male presents with a palpable mass related to the testis. On examination, the testis is enlarged and the mass is hard. What is the next best diagnostic step?

A. Ultrasound (Correct Answer)
B. Fine Needle Aspiration Cytology (FNAC)
C. Biopsy
D. High inguinal orchidectomy

Explanation: **Explanation:** In a young male presenting with a hard, painless testicular mass, the primary clinical suspicion is **Testicular Germ Cell Tumor (GCT)**. **Why Ultrasound is the correct answer:** Scrotal Ultrasound (USG) is the **initial investigation of choice** and the gold standard for confirming the presence of a testicular mass. It has nearly 100% sensitivity for detecting testicular tumors. It helps differentiate between intra-testicular (usually malignant) and extra-testicular (usually benign) lesions and can distinguish solid masses from cystic conditions like hydrocele or spermatocele. **Why other options are incorrect:** * **FNAC and Biopsy:** These are **strictly contraindicated** in suspected testicular cancer. Violating the scrotum (trans-scrotal approach) risks **lymphatic seeding** of tumor cells to the inguinal lymph nodes, altering the natural lymphatic drainage (which normally goes to the retroperitoneal nodes) and worsening the prognosis. * **High Inguinal Orchidectomy:** While this is the **definitive surgical treatment** and provides the histopathological diagnosis, it is not the "next step." Imaging (USG) and serum tumor markers must be performed first to characterize the mass and plan management. **NEET-PG High-Yield Pearls:** * **Standard of Care:** Any solid intra-testicular mass is considered malignant until proven otherwise. * **Tumor Markers:** Always check AFP, beta-hCG, and LDH *before* surgery. * **Surgical Approach:** Always "High Inguinal" to allow for early vascular control and to avoid scrotal contamination. * **Lymphatic Drainage:** Testis drains to **Para-aortic nodes**; Scrotum drains to **Superficial Inguinal nodes**.

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Renal Cell Carcinoma

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Testicular Tumors

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