Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 41: In severe hypospadias, how is the possibility of an intersex problem definitively assessed?

A. Careful inspection of external genitalia
B. Biopsy to examine gonadal tissue
C. Karyotyping to determine chromosomal sex (Correct Answer)
D. Hormone level assay

Explanation: **Explanation:** In cases of **severe hypospadias** (specifically proximal, penoscrotal, or perineal types), especially when associated with **undescended testes (cryptorchidism)**, the risk of a Disorder of Sex Development (DSD) or intersex condition is significantly high. **1. Why Karyotyping is the Correct Answer:** Karyotyping is the gold standard and definitive initial step to determine the **chromosomal sex** of the child. In severe hypospadias, the phenotype may appear ambiguous. Identifying the genotype (e.g., 46,XY vs. 45,X/46,XY mosaicism or 46,XX) is essential to rule out conditions like Mixed Gonadal Dysgenesis or Congenital Adrenal Hyperplasia (CAH), which can present with virilized female genitalia. **2. Why Other Options are Incorrect:** * **Careful inspection (A):** While essential for clinical staging, physical exam alone cannot differentiate between a severely virilized female and an undervirilized male. * **Biopsy (B):** Gonadal biopsy is invasive and usually reserved for specific cases where internal anatomy remains unclear after imaging and genetic testing (e.g., confirming ovotestis). It is not the first-line definitive assessment. * **Hormone level assay (D):** While useful for assessing adrenal function (17-OHP for CAH) or testicular function (Testosterone/AMH), hormone levels fluctuate and do not define the chromosomal sex, which is the baseline for intersex classification. **Clinical Pearls for NEET-PG:** * **Rule of Thumb:** Any infant with hypospadias and at least one non-palpable testis should be considered a DSD case until proven otherwise. * **Most Common Cause of Ambiguous Genitalia:** Congenital Adrenal Hyperplasia (CAH) – specifically 21-hydroxylase deficiency. * **Imaging:** Ultrasound is often the next step after karyotyping to look for a uterus or other Mullerian structures. * **Surgical Timing:** Hypospadias repair is ideally performed between **6 to 12 months** of age.

Question 42: Remnants of the primitive streak give rise to which of the following tumors?

A. Neuroblastomas
B. Wilms' tumor
C. Sacrococcygeal teratoma (Correct Answer)
D. Hepatoblastoma

Explanation: **Explanation:** **Correct Option: C. Sacrococcygeal teratoma** The primitive streak is a structure that forms in the blastocyst during the third week of gestation (gastrulation). Normally, the primitive streak undergoes regression and disappears by the end of the fourth week. If remnants of the primitive streak persist in the sacrococcygeal region, they can differentiate into all three germ layers (ectoderm, mesoderm, and endoderm), leading to the formation of a **Sacrococcygeal Teratoma (SCT)**. This is the most common tumor in newborns. **Incorrect Options:** * **A. Neuroblastoma:** This tumor arises from **neural crest cells** of the sympathetic nervous system, most commonly occurring in the adrenal medulla. * **B. Wilms’ tumor (Nephroblastoma):** This is an embryonal renal tumor derived from the **metanephric blastema** (primitive renal tissue). * **D. Hepatoblastoma:** This is the most common primary liver tumor in children, arising from **primitive hepatic parenchymal cells**. **High-Yield Clinical Pearls for NEET-PG:** * **Epidemiology:** SCT is more common in females (4:1 ratio), though malignant transformation is more common in males. * **Altman Classification:** Used to categorize SCT based on its location (Type I is primarily external; Type IV is entirely presacral/internal). * **Diagnosis:** Often diagnosed via prenatal ultrasound; elevated **Alpha-fetoprotein (AFP)** levels can be used as a marker for malignant components (yolk sac elements). * **Management:** Surgical excision is the treatment of choice and **must include the removal of the coccyx** to prevent recurrence.

Question 43: Complications arising out of an arteriovenous fistula created for renal failure include the following EXCEPT?

A. Infection
B. Thrombosis
C. High output cardiac failure
D. Necrosis of the distal part (Correct Answer)

Explanation: **Explanation:** Arteriovenous (AV) fistulas are the gold standard for long-term hemodialysis access. Understanding their hemodynamics is crucial for identifying potential complications. **Why "Necrosis of the distal part" is the correct answer:** While an AV fistula can cause **"Steal Syndrome"** (where blood is diverted away from the distal extremity), it typically presents as coldness, pain, or paresthesia. True **necrosis or gangrene** of the distal part is extremely rare because the body usually compensates through collateral circulation. If ischemia occurs, it is generally manageable before reaching the stage of frank necrosis. Therefore, necrosis is not considered a standard or common complication compared to the other options. **Analysis of Incorrect Options:** * **Infection:** Though less common than in synthetic grafts, AV fistulas can become infected (cellulitis or abscess), especially due to repeated needle punctures for dialysis. * **Thrombosis:** This is the most common cause of fistula failure. It often results from venous outflow obstruction, intimal hyperplasia, or hypotension. * **High Output Cardiac Failure:** An AV fistula reduces total peripheral resistance. To maintain blood pressure, the heart increases stroke volume and heart rate. If the fistula flow (Qf) is too high (typically >20% of cardiac output), it can lead to high-output heart failure. **NEET-PG High-Yield Pearls:** * **Brescia-Cimino Fistula:** The most common type, created between the **Radial Artery** and the **Cephalic Vein** at the wrist. * **Rule of 6s for Maturation:** A fistula is ready when it is >6mm in diameter, <6mm deep from the skin, and has a flow of >600mL/min. * **Steal Syndrome:** More common in elderly patients and diabetics with calcified vessels. * **Aneurysm formation:** A late complication due to repeated punctures at the same site.

Question 44: Which of the following is a common retroperitoneal tumor?

A. Fibrosarcoma
B. Liposarcoma (Correct Answer)
C. Dermoid cyst
D. Rhabdosarcoma

Explanation: **Explanation:** Primary retroperitoneal tumors are rare neoplasms that arise within the retroperitoneal space but outside the major organs (like the kidneys or pancreas). **Why Liposarcoma is correct:** Among primary retroperitoneal tumors, **mesodermal tumors** are the most common (approx. 80%), and the vast majority of these are malignant. **Liposarcoma** is the most common primary retroperitoneal malignancy in adults. It typically presents as a slow-growing, painless abdominal mass that can reach a massive size before detection. On imaging (CT/MRI), it is characterized by varying amounts of fat density. **Analysis of Incorrect Options:** * **Fibrosarcoma:** While it is a mesenchymal tumor, it is significantly less common in the retroperitoneum compared to liposarcoma or leiomyosarcoma. * **Dermoid Cyst:** These are germ cell tumors. While they can occur in the retroperitoneum (especially in children or as a site for extragonadal germ cell tumors), they are far less common than mesenchymal malignancies in this anatomical space. * **Rhabdosarcoma:** This is the most common soft tissue sarcoma in **children**, but it is not the most common retroperitoneal tumor in the general population or adults. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Thumb:** 80% of primary retroperitoneal tumors are malignant. * **Top 3 Malignancies:** Liposarcoma (most common), followed by Leiomyosarcoma and Malignant Fibrous Histiocytoma (MFH). * **Clinical Presentation:** Often asymptomatic until they are large enough to displace adjacent organs (e.g., ureteric obstruction or bowel displacement). * **Treatment:** Aggressive surgical resection with clear margins is the mainstay of treatment, as these tumors are often resistant to radiotherapy and chemotherapy.

Question 45: Which complication following kidney transplantation is caused by Cytomegalovirus (CMV)?

A. Parotitis
B. Cholecystitis
C. Pyelonephritis (Correct Answer)
D. Gastrointestinal Necrosis and stricture

Explanation: **Explanation:** Cytomegalovirus (CMV) is the most common opportunistic viral infection following solid organ transplantation, typically occurring 1–6 months post-transplant. In the context of kidney transplantation, CMV has a specific tropism for the allograft. **Why Pyelonephritis is correct:** CMV infection in a renal transplant recipient often manifests as **CMV Nephritis** (a form of viral pyelonephritis). The virus causes direct tissue injury to the renal parenchyma, leading to graft dysfunction, fever, and histological changes such as "owl’s eye" intranuclear inclusions. It is a significant cause of morbidity and can predispose the patient to secondary bacterial pyelonephritis or acute rejection. **Analysis of Incorrect Options:** * **A. Parotitis:** While CMV can be isolated from saliva, acute parotitis is more commonly associated with Mumps or bacterial infections (Staph. aureus) in dehydrated post-operative patients. * **B. Cholecystitis:** CMV can cause "Acalculous Cholecystitis" in immunocompromised states, but it is a rare manifestation compared to the high incidence of renal involvement in kidney transplant patients. * **D. Gastrointestinal Necrosis and stricture:** CMV is a common cause of GI ulceration and bleeding (especially in the colon), but frank necrosis and stricture formation are more characteristic of ischemic bowel disease or advanced necrotizing enterocolitis. **High-Yield Pearls for NEET-PG:** * **Timing:** CMV typically appears in the "middle period" (1–6 months) post-transplant. * **Diagnosis:** PCR for CMV DNA is the gold standard for monitoring. * **Prophylaxis/Treatment:** **Valganciclovir** is used for prophylaxis; **Ganciclovir** is the treatment of choice for active infection. * **Biopsy:** Look for "Owl’s eye" inclusion bodies in the renal tubular epithelial cells.

Question 46: Name the operation shown here.

A. Boari flap operation (Correct Answer)
B. Young operation
C. Pierce operation
D. Nesbitt operation

Explanation: ***Boari flap operation*** - A **urological reconstructive procedure** used for bridging **distal ureteral defects** by creating a **pedicled bladder flap** that is tubularized to replace the damaged ureter. - The flap is raised from the **posterior bladder wall**, maintaining its **blood supply**, and is particularly useful for defects in the **lower third of the ureter**. *Young operation* - A **Y-V plasty** procedure performed at the **bladder neck** to treat **bladder neck contracture** or **stenosis**. - Does not involve creating a **tubular flap** for ureteral reconstruction like the Boari flap operation. *Pierce operation* - This is not a commonly recognized standard **urological procedure** in current surgical literature. - The term does not correspond to any established technique for **ureteral reconstruction** or bladder surgery. *Nesbitt operation* - An **excision-plication technique** used primarily for treating **Peyronie's disease** and **penile curvature (chordee)**. - Involves **shortening the longer side** of the penis rather than any **ureteral or bladder reconstruction** procedures.

Question 47: Which of the following statements regarding pain of renal and urinary tract origin is true?

A. Pain of renal origin is a deep-seated, sickening ache.
B. Pain from a ureteric stone is colicky and the patient rolls around in agony.
C. Pain from the urinary bladder is a suprapubic discomfort.
D. All of the above. (Correct Answer)

Explanation: This question tests the clinical understanding of visceral and somatic pain patterns in the urogenital system, a high-yield area for NEET-PG. ### **Explanation of Options** * **Option A (Renal Pain):** Renal pain is typically caused by sudden distension of the renal capsule. It is mediated by the T10–L1 sympathetic fibers. Because it is a visceral sensation, it is perceived as a **dull, deep-seated, and sickening ache** located in the costovertebral angle, often radiating toward the umbilicus. * **Option B (Ureteric Pain):** Ureteric colic is caused by hyperperistalsis and spasm of the smooth muscle as it attempts to bypass an obstruction (e.g., a stone). Unlike peritonitis (where patients lie still), patients with **ureteric colic are restless and "roll around"** trying to find a comfortable position. The pain typically radiates from the "loin to groin." * **Option C (Bladder Pain):** Bladder pain is most commonly due to overdistension or inflammation (cystitis). It is felt as **suprapubic discomfort** or heaviness. In cases of acute retention, it is agonizing, whereas in cystitis, it is often associated with a burning sensation referred to the distal urethra during micturition. Since all three descriptions accurately reflect the clinical presentation of urological pain, **Option D is the correct answer.** ### **High-Yield Clinical Pearls for NEET-PG** * **Murphy’s Kidney Punch:** Tenderness elicited by percussion over the costovertebral angle, indicative of renal inflammation (e.g., pyelonephritis). * **Radiation Patterns:** * Upper ureter: Radiates to the testicle (T11–12). * Lower ureter: Radiates to the scrotum or labia (L1–2). * **Strangury:** A painful, frequent urge to urinate with the passage of only small amounts of urine, often due to bladder neck irritation. * **Differentiation:** Renal pain is constant, while ureteric pain is intermittent and spasmodic (colicky).

Question 48: What is the ideal method to remove a retained Foley's catheter if its balloon does not deflate?

A. Over-distend the balloon with water until it bursts
B. Dissolve the balloon by injecting ether
C. CT-guided rupture of the balloon
D. USG-guided rupture of the balloon (Correct Answer)

Explanation: **Explanation:** A retained Foley’s catheter due to a non-deflating balloon is a common urological emergency, usually caused by a faulty valve or a crystallized inflation channel. **Why USG-guided rupture is the correct answer:** The primary goal is to rupture the balloon safely without injuring the bladder wall or leaving fragments behind. **USG-guided percutaneous suprapubic needle puncture** is considered the ideal and safest method. It allows for real-time visualization, ensuring the needle precisely targets the balloon while avoiding the bladder mucosa and surrounding bowel loops. **Analysis of Incorrect Options:** * **Option A (Over-distension with water):** This is discouraged because it can lead to "explosive" rupture. This may cause bladder trauma or result in the balloon shattering into multiple small fragments, which can act as a nidus for future stone formation. * **Option B (Injecting ether/mineral oil):** Historically used to dissolve latex, this is now **contraindicated**. These substances cause severe chemical cystitis and mucosal irritation. * **Option C (CT-guided rupture):** While accurate, it is unnecessary, expensive, and involves avoidable radiation exposure. USG is faster, portable, and equally effective. **Clinical Pearls for NEET-PG:** 1. **Initial Step:** Always try to cut the side port (valve) first to rule out a faulty valve mechanism. 2. **Lubrication:** If cutting the valve fails, passing a fine central venous pressure (CVP) guide wire through the inflation channel to clear an obstruction is a non-invasive next step. 3. **Fragment Check:** After any balloon rupture, always inspect the catheter tip to ensure the balloon is intact. If fragments are suspected, perform a cystoscopy to retrieve them. 4. **Alternative:** In females, the balloon can sometimes be ruptured transvaginally or via the urethra alongside the catheter.

Question 49: During endoscopic surgery, what is the typical patient position?

A. Trendelenberg
B. Lateral
C. Reverse Trendelenberg (Correct Answer)
D. Lithotomy

Explanation: **Explanation:** In endoscopic urological surgeries, particularly **Upper Tract Endourology** (such as PCNL or Ureteroscopy) and **Laparoscopic Urology**, the **Reverse Trendelenburg** position is frequently utilized. **Why Reverse Trendelenburg is Correct:** The primary goal of this position (head up, feet down) is to utilize **gravity** to shift the abdominal viscera (intestines) downwards, away from the operative field in the upper abdomen or retroperitoneum. This provides better visualization and more working space for the surgeon. Additionally, in procedures involving the kidney, this position helps prevent the cephalad migration of stones or fragments during irrigation. **Analysis of Incorrect Options:** * **Trendelenburg (A):** This position (head down, feet up) is used for **lower abdominal or pelvic surgeries** (e.g., Radical Cystectomy or Prostatectomy) to move the intestines away from the pelvis. It is avoided in upper tract surgery as it pushes viscera toward the diaphragm. * **Lateral (B):** While the lateral kidney position is used for open nephrectomies, it is not the "typical" position for standard endoscopic/laparoscopic access unless specifically performing a retroperitoneoscopic approach. * **Lithotomy (D):** This is the standard position for **Lower Urinary Tract** endoscopic procedures (e.g., TURP, Cystoscopy, or Ureteroscopy for distal stones), but it does not provide the visceral displacement required for general endoscopic/laparoscopic access to the upper tract. **High-Yield Clinical Pearls for NEET-PG:** * **Reverse Trendelenburg** improves functional residual capacity (FRC) and is safer for obese patients compared to Trendelenburg. * **Trendelenburg Position** increases intracranial and intraocular pressure; it is contraindicated in patients with glaucoma or head injuries. * For **TURP**, the Lithotomy position is mandatory, but ensure the legs are not hyperflexed to prevent **Peroneal Nerve** injury.

Question 50: Bosniak classification is used for the assessment of which of the following?

A. Renal tuberculosis
B. Renal cysts (Correct Answer)
C. Renal cell carcinoma (RCC)
D. Vesicoureteric reflux (VUR)

Explanation: The **Bosniak classification** is a standardized system used to evaluate and categorize **renal cysts** based on their appearance on contrast-enhanced CT scans. Its primary purpose is to predict the risk of malignancy and guide clinical management (observation vs. surgical intervention). ### **Why "Renal Cysts" is Correct** The classification divides renal cystic masses into five categories based on features like wall thickness, septations, calcification, and enhancement: * **Category I:** Simple benign cyst (0% malignancy risk). * **Category II:** Minimally complex, benign (e.g., thin septa, fine calcification). * **Category IIF:** "Follow-up" required; moderately complex. * **Category III:** Indeterminate; thick/irregular walls or septa (approx. 50% malignancy risk). * **Category IV:** Clearly malignant; solid components with enhancement (approx. 100% malignancy risk). ### **Why Other Options are Incorrect** * **Renal Tuberculosis:** Diagnosed via urine culture (Lowenstein-Jensen medium) or PCR. Imaging shows "putty kidney" or "thimble bladder," but Bosniak is not used. * **Renal Cell Carcinoma (RCC):** While Bosniak helps identify if a cyst is actually a cystic RCC, the classification itself is specifically for the *assessment of cystic lesions*, not the staging or grading of solid RCC. * **Vesicoureteric Reflux (VUR):** Assessed using the **International Study of Kidney Disease in Children (ISKDC) grading** (Grades I-V) via Voiding Cystourethrogram (VCUG). ### **High-Yield Clinical Pearls for NEET-PG** * **Bosniak I & II:** No follow-up needed. * **Bosniak IIF:** Requires serial imaging. * **Bosniak III & IV:** Usually require surgical intervention (Partial or Radical Nephrectomy). * **Gold Standard Imaging:** Contrast-Enhanced CT (CECT) is the modality of choice for Bosniak grading.

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