Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 561: In pelvi-ureteric junction (PUJ) obstruction causing hydronephrosis, which of the following statements is false?

A. The condition may be asymptomatic
B. It can be diagnosed in utero
C. Ultrasound scanning is the least invasive method of imaging
D. If there is more than 5 percent of function in the obstructed kidney, a procedure to preserve the kidney is carried out (Correct Answer)

Explanation: **Explanation:** The management of Pelvi-Ureteric Junction (PUJ) obstruction depends heavily on the **Differential Renal Function (DRF)**. **Why Option D is False (The Correct Answer):** In clinical practice, the threshold for performing a reconstructive procedure (like Anderson-Hynes Pyeloplasty) versus a Nephrectomy is generally **10-15%**. If a kidney has **less than 10% function**, it is considered a "non-functioning" kidney, and a nephrectomy is usually indicated because the organ is unlikely to recover significant function even after the obstruction is relieved. Therefore, saying a kidney with only 5% function is preserved is incorrect. **Analysis of Other Options:** * **Option A:** Many cases of PUJ obstruction are found incidentally during imaging for other reasons or remain asymptomatic until complications like stones or infection occur. * **Option B:** With the routine use of antenatal ultrasound, PUJ obstruction is frequently diagnosed **in utero** as fetal hydronephrosis. * **Option C:** **Ultrasound** is the first-line, least invasive imaging modality to visualize the dilated pelvis and calyces without exposing the patient to radiation or contrast. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** **DTPA or MAG3 Renogram** is used to assess the degree of obstruction and the split renal function. * **Most Common Cause:** Congenital narrowing at the PUJ; however, an **extrinsic crossing vessel** (lower pole accessory renal artery) is a significant cause in adults. * **Dietl’s Crisis:** Episodic loin pain triggered by increased fluid intake (e.g., alcohol or caffeine), characteristic of intermittent PUJ obstruction. * **Surgical Treatment of Choice:** **Anderson-Hynes Dismembered Pyeloplasty.**

Question 562: Referred pain from which of the following conditions may be felt along the inner side of the right thigh?

A. Inflamed pelvic appendix
B. Inflamed ovaries
C. Stone in pelvic ureter
D. Pelvic abscess (Correct Answer)

Explanation: ### Explanation The correct answer is **Pelvic abscess**. **1. Why Pelvic Abscess is Correct:** The key to this question lies in the anatomy of the **obturator nerve** (L2-L4). The obturator nerve runs along the lateral wall of the pelvis, specifically in the **obturator fossa**. A pelvic abscess (often resulting from a ruptured appendix or pelvic inflammatory disease) can cause irritation of the obturator nerve as it passes through this region. Since the obturator nerve provides sensory innervation to the **skin of the medial (inner) side of the thigh**, irritation or pressure from the abscess results in referred pain to this specific dermatome. This is clinically known as the **Howship-Romberg sign** when associated with an obturator hernia, but the physiological principle of nerve irritation remains the same for a pelvic abscess. **2. Why the Other Options are Incorrect:** * **Inflamed pelvic appendix:** While a pelvic appendix can cause a pelvic abscess, the inflammation itself usually presents with suprapubic pain or rectal/bladder irritability (tenesmus/frequency). It only causes inner thigh pain if it leads to an abscess that irritates the obturator nerve. * **Inflamed ovaries:** Ovarian pain is typically referred to the T10-T11 dermatomes (umbilical/iliac region) via the sympathetic fibers. * **Stone in pelvic ureter:** Ureteric colic typically follows the "loin to groin" distribution. A stone in the lower (pelvic) ureter often refers pain to the scrotum, labia majora, or the tip of the urethra (T11-L2), but not specifically the inner thigh. **3. Clinical Pearls for NEET-PG:** * **Obturator Internus Test:** Internal rotation of the flexed right hip causes pain in cases of pelvic appendicitis/abscess due to contact with the obturator internus muscle. * **Howship-Romberg Sign:** Pain down the inner thigh to the knee, relieved by hip flexion; pathognomonic for an **obturator hernia**. * **Nerve Supply:** Always remember that the **Genitofemoral nerve (L1, L2)** is responsible for the cremasteric reflex, while the **Obturator nerve** handles medial thigh sensation.

Question 563: Which type of kidney stone is most sensitive to extracorporeal shock wave lithotripsy (ESWL)?

A. Calcium oxalate stone
B. Struvite (triple phosphate) stone
C. Cystine stone
D. Uric acid stone (Correct Answer)

Explanation: **Explanation:** The sensitivity of a kidney stone to **Extracorporeal Shock Wave Lithotripsy (ESWL)** is primarily determined by its **Hounsfield Unit (HU)** value on CT scan and its crystalline structure. Stones with lower density and higher fragility fragment more easily. **Why Uric Acid is the Correct Answer:** Uric acid stones are the most "fragile" or sensitive to ESWL. They have a low density (typically <500 HU) and a non-compact crystalline structure, allowing shock waves to propagate through and shatter them effectively. While uric acid stones are often managed medically via urinary alkalinization (dissolution therapy), if ESWL is performed, they fragment with the least amount of energy. **Analysis of Incorrect Options:** * **Calcium Oxalate:** These are the most common stones. **Calcium oxalate dihydrate** stones are relatively sensitive, but **Calcium oxalate monohydrate** stones are very dense (>1000 HU) and notoriously resistant to ESWL. * **Struvite (Triple Phosphate):** These are associated with infections (Proteus). While they are relatively soft, they are often large (Staghorn calculi), making ESWL less effective as a monotherapy due to the high stone burden and risk of "Steinstrasse." * **Cystine Stone:** These are the **most resistant** to ESWL. They have a "waxy" consistency and a dense crystalline lattice that absorbs shock waves rather than fracturing. **NEET-PG High-Yield Pearls:** * **Order of ESWL Sensitivity:** Uric Acid > Calcium Oxalate Dihydrate > Struvite > Calcium Oxalate Monohydrate > Cystine (Least sensitive). * **Size Limit:** ESWL is generally preferred for stones **<2 cm**. For stones >2 cm or lower pole stones >1 cm, PCNL is the gold standard. * **Contraindications for ESWL:** Pregnancy, uncorrected bleeding diathesis, distal obstruction, and uncontrolled UTI. * **Steinstrasse:** A complication of ESWL where fragmented stone gravel blocks the ureter ("stone street").

Question 564: What is the standard treatment for Stage II testicular teratoma?

A. Orchidectomy + Retroperitoneal Lymph Node Dissection (RPLND) (Correct Answer)
B. Orchidectomy + Chemotherapy
C. Orchidectomy
D. Radiotherapy

Explanation: **Explanation:** The management of testicular germ cell tumors (GCTs) depends on the histological type (Seminoma vs. Non-Seminomatous Germ Cell Tumors - NSGCT) and the clinical stage. Teratoma is a subtype of **NSGCT**. **Why Option A is Correct:** The primary treatment for any suspected testicular tumor is **High Inguinal Orchidectomy**. For **Stage II NSGCT** (metastasis to retroperitoneal lymph nodes), the standard of care is surgical clearance via **Retroperitoneal Lymph Node Dissection (RPLND)**. Teratomas are notoriously **chemo-resistant and radio-resistant**; therefore, surgical excision of the primary tumor and the involved nodes is the only definitive way to ensure cure and prevent "Growing Teratoma Syndrome." **Why Other Options are Incorrect:** * **Option B:** While chemotherapy (BEP regimen) is used for other NSGCTs (like Embryonal carcinoma or Yolk sac tumors), teratomas do not respond well to drugs. * **Option C:** Orchidectomy alone is only sufficient for **Stage I** disease (tumor confined to the testis) with close surveillance. Stage II implies nodal spread, requiring further intervention. * **Option D:** Radiotherapy is a primary treatment modality for **Seminomas** (which are highly radiosensitive) but has no role in the management of NSGCTs/Teratomas. **High-Yield Clinical Pearls for NEET-PG:** * **Tumor Markers:** Teratomas typically do not produce AFP or β-hCG. If AFP is elevated, it suggests a Yolk sac component; if β-hCG is elevated, it suggests Choriocarcinoma. * **Lymphatic Spread:** Testicular tumors spread first to the **Para-aortic lymph nodes** (at the level of L2), except if there is scrotal involvement (then to inguinal nodes). * **Growing Teratoma Syndrome:** A clinical scenario where tumor markers normalize after chemotherapy, but the retroperitoneal mass increases in size; the treatment is surgical resection.

Question 565: Which of the following is true about the apocrine gland?

A. It is a modified sweat gland. (Correct Answer)
B. It is a modified sebaceous gland.
C. It is present in the axilla and groin.
D. Hidradenitis suppurativa is an infection of the apocrine gland.

Explanation: ### Explanation **Correct Answer: A. It is a modified sweat gland.** **Underlying Medical Concept:** Sweat glands are categorized into two types: **Eccrine** and **Apocrine**. Apocrine glands are specialized, modified sweat glands that develop in association with hair follicles. Unlike eccrine glands (which open directly onto the skin surface and are involved in thermoregulation), apocrine glands secrete a thick, milky fluid into the hair follicle canal. This secretion is initially odorless but becomes malodorous upon bacterial decomposition. **Analysis of Options:** * **Option B (Incorrect):** Apocrine glands are modified **sweat glands**, not sebaceous glands. Sebaceous glands are holocrine glands that secrete sebum (oil). * **Option C (Incorrect):** While apocrine glands are indeed found in the axilla and groin, they are also found in the areola, perineum, and perianal region. However, in the context of this specific question format (often seen in surgical exams), the most fundamental histological definition is that they are modified sweat glands. * **Option D (Incorrect):** While Hidradenitis Suppurativa (HS) was historically thought to be a primary infection of the apocrine glands, current medical understanding defines it as a **chronic inflammatory follicular occlusive disease**. The primary event is the occlusion of the hair follicle, with secondary involvement/inflammation of the apocrine glands. **High-Yield Clinical Pearls for NEET-PG:** * **Mode of Secretion:** Despite the name "apocrine," modern electron microscopy shows these glands actually secrete via **merocrine** mechanisms (exocytosis). * **Modified Apocrine Glands:** Examples include **Moll’s glands** (eyelids), **Ceruminous glands** (external auditory canal), and **Mammary glands**. * **Control:** They are inactive until puberty and are stimulated by emotional stress and hormonal changes (adrenergic sympathetic innervation). * **Fox-Fordyce Disease:** A chronic pruritic papular eruption caused by the blockage of apocrine sweat ducts.

Question 566: What is the most common cause of nephrolithiasis?

A. Hypocitraturia
B. Hyperoxaluria
C. Hyperuricosuria
D. Idiopathic hypercalciuria (Correct Answer)

Explanation: **Explanation:** Nephrolithiasis (kidney stone formation) is a multifactorial process, but the vast majority of stones (approx. 75-80%) are composed of **calcium oxalate**. Among the metabolic abnormalities identified in these patients, **Idiopathic Hypercalciuria** is the most common, found in about 50% of stone formers. **1. Why Idiopathic Hypercalciuria is Correct:** It is defined as hypercalciuria (calcium excretion >4 mg/kg/day) in the absence of systemic hypercalcemia. The underlying mechanism involves increased intestinal calcium absorption (absorptive), decreased renal tubular reabsorption (renal-leak), or increased bone resorption. This leads to supersaturation of urine with calcium salts, promoting crystallization. **2. Analysis of Incorrect Options:** * **Hypocitraturia:** Citrate is a potent inhibitor of stone formation as it binds to calcium. While a significant risk factor (found in ~20-40% of cases), it is less frequent than hypercalciuria. * **Hyperoxaluria:** Excess oxalate is a strong promoter of calcium oxalate stones (often due to enteric issues like Crohn’s disease), but it is statistically less common than idiopathic hypercalciuria. * **Hyperuricosuria:** High urinary uric acid acts as a "nidus" for calcium stones (heterogeneous nucleation). While common in patients with high protein intake, it is not the primary cause in the majority of the population. **Clinical Pearls for NEET-PG:** * **Most common stone type:** Calcium Oxalate (specifically Calcium Oxalate Monohydrate/Whewellite). * **Most common metabolic abnormality:** Idiopathic Hypercalciuria. * **Dietary Advice:** Patients with hypercalciuria should **not** restrict dietary calcium; instead, they should restrict sodium and animal protein, as low calcium intake paradoxically increases oxalate absorption and stone risk. * **Drug of Choice:** Thiazide diuretics (e.g., Chlorthalidone) are used to treat idiopathic hypercalciuria as they increase renal calcium reabsorption.

Question 567: After vasectomy, when does azoospermia become evident?

A. 2 to 3 weeks
B. 4 to 6 weeks
C. 8 to 10 weeks
D. 10 to 12 weeks (Correct Answer)

Explanation: **Explanation:** The correct answer is **10 to 12 weeks**. **1. Underlying Medical Concept:** Vasectomy involves the occlusion or transection of the vas deferens to prevent sperm from entering the ejaculate. However, sterility is **not immediate**. Sperm already present in the reproductive tract distal to the site of ligation (the ampulla of the vas and the seminal vesicles) must be cleared through subsequent ejaculations. On average, it takes approximately **15 to 20 ejaculations** or a duration of **10 to 12 weeks** to achieve complete azoospermia. **2. Analysis of Options:** * **A & B (2 to 6 weeks):** These timeframes are too short. While the sperm count begins to drop immediately, residual viable sperm remain in the distal segments, posing a high risk of pregnancy if alternative contraception is not used. * **C (8 to 10 weeks):** While some patients may achieve azoospermia by this point, standard clinical guidelines (such as those from the AUA and BAUS) emphasize waiting until at least 12 weeks to ensure a "clear" sample in the majority of the population. **3. High-Yield Clinical Pearls for NEET-PG:** * **Post-Vasectomy Semen Analysis (PVSA):** This is the gold standard to confirm success. It is typically performed at **12 weeks** post-procedure. * **Contraception:** Patients must be strictly advised to use alternative contraceptive methods until **two consecutive semen analyses** show zero sperm (azoospermia). * **Recanalization:** Spontaneous recanalization is a rare cause of early or late failure. * **Most Common Complication:** Scrotal hematoma is the most common early complication; sperm granuloma is a common late finding. **Conclusion:** For the purpose of NEET-PG, remember the "Rule of 12": 12 weeks or roughly 20 ejaculations are required before a patient can be declared sterile.

Question 568: During renal transplantation, to which vessel is the renal vein connected?

A. Inferior Vena Cava (IVC)
B. External Iliac Vein (Correct Answer)
C. Internal Iliac Vein
D. Gonadal Vein

Explanation: **Explanation:** In clinical renal transplantation, the donor kidney is typically placed in the **iliac fossa** (heterotopic transplantation). This location is preferred because it provides easy access to the bladder and major pelvic vessels. **1. Why External Iliac Vein is Correct:** The standard surgical technique involves performing vascular anastomoses to the iliac vessels. The **donor renal vein** is most commonly anastomosed to the **External Iliac Vein (EIV)** in an end-to-side fashion. This is because the EIV is easily accessible, has a large caliber, and lies superficially in the iliac fossa, making the venous drainage efficient. **2. Analysis of Incorrect Options:** * **Inferior Vena Cava (IVC):** While the native kidneys drain into the IVC, it is located too high (retroperitoneal) for a standard pelvic transplant. IVC anastomosis is generally reserved for pediatric recipients or specific complex cases. * **Internal Iliac Vein:** This vessel is deeper and more difficult to access than the external iliac vein. While the **Internal Iliac Artery** was historically used for the arterial anastomosis (end-to-end), the vein of choice remains the External Iliac. * **Gonadal Vein:** This vessel is far too small in caliber to accommodate the high-volume venous return from a transplanted kidney. **3. High-Yield Clinical Pearls for NEET-PG:** * **Arterial Anastomosis:** The donor renal artery is most commonly connected to the **External Iliac Artery** (end-to-side). Historically, the Internal Iliac Artery (end-to-end) was used. * **Ureteric Reimplantation:** The donor ureter is connected to the recipient's bladder using the **Lich-Gregoir technique** (extravesical ureteroneocystostomy). * **Side Selection:** Usually, the **left donor kidney** is preferred (due to a longer renal vein), but it is placed in the **right iliac fossa** of the recipient to allow the renal pelvis and ureter to lie anteriorly.

Question 569: Which of the following statements about ureteral duplication is false?

A. Females are affected more commonly.
B. It follows the Weigert-Meyer rule.
C. It is inherited in an autosomal dominant pattern.
D. It is typically unilateral. (Correct Answer)

Explanation: ### Explanation: Ureteral Duplication Ureteral duplication is the most common congenital anomaly of the urinary tract. Understanding its epidemiology and anatomical rules is crucial for NEET-PG. **Why Option D is the Correct (False) Statement:** Ureteral duplication is **more commonly bilateral** than unilateral. While it can occur on one side, clinical studies and radiological findings indicate a higher prevalence of bilateral involvement in affected individuals. Therefore, stating it is "typically unilateral" is factually incorrect. **Analysis of Other Options:** * **Option A (Females affected more commonly):** This is **true**. There is a strong female predilection, with a female-to-male ratio of approximately 2:1. * **Option B (Follows Weigert-Meyer Rule):** This is **true**. In a complete duplication, the **upper pole ureter** opens ectopically (inferior and medial to the normal orifice) and often ends in a **ureterocele**, while the **lower pole ureter** opens orthotopically (superior and lateral) and is prone to **vesicoureteral reflux (VUR)**. * **Option C (Autosomal Dominant Inheritance):** This is **true**. Ureteral duplication often shows a familial pattern, most commonly inherited in an autosomal dominant fashion with incomplete penetrance. ### High-Yield Clinical Pearls for NEET-PG: * **Weigert-Meyer Rule:** Remember "Upper-Ectopic/Ureterocele" and "Lower-Reflux." * **Most common presentation:** Often asymptomatic, but if symptomatic, it presents with recurrent UTIs or urinary incontinence (in females with an ectopic ureter opening distal to the sphincter). * **Diagnosis:** Voiding Cystourethrogram (VCUG) is the gold standard for diagnosing associated VUR, while IVP or MRU can delineate the anatomy.

Question 570: A patient with Stage II Transitional Cell carcinoma of the bladder presents with hematuria. Which of the following statements regarding the management of her condition is true?

A. Cystoscopic fulguration is the standard treatment.
B. Radical cystectomy is indicated. (Correct Answer)
C. History of smoking is not a risk factor.
D. Chemotherapy has no role in management.

Explanation: ### Explanation **1. Why Radical Cystectomy is the Correct Answer:** Bladder cancer staging is the primary determinant of management. **Stage II (T2)** Transitional Cell Carcinoma (TCC) signifies **Muscle-Invasive Bladder Cancer (MIBC)**, where the tumor has invaded the muscularis propria. For fit patients with MIBC, the gold standard treatment is **Radical Cystectomy** with pelvic lymph node dissection and urinary diversion. This aggressive approach is necessary because muscle invasion significantly increases the risk of lymphatic spread and systemic metastasis. **2. Analysis of Incorrect Options:** * **Option A:** Cystoscopic fulguration or Transurethral Resection of Bladder Tumor (TURBT) is the standard for **Non-Muscle Invasive Bladder Cancer (NMIBC)** (Stages Ta, T1, or CIS). It is insufficient for Stage II as it cannot ensure complete clearance of deep muscle invasion. * **Option C:** **Smoking** is the most significant risk factor for TCC, increasing the risk 3–4 fold. Other risk factors include exposure to aromatic amines (aniline dyes) and Schistosomiasis (associated with Squamous Cell Carcinoma). * **Option D:** Chemotherapy plays a vital role. **Neoadjuvant Chemotherapy (NAC)** (cisplatin-based) followed by radical cystectomy is the current standard of care for Stage II-III disease, as it improves overall survival compared to surgery alone. **3. Clinical Pearls for NEET-PG:** * **Most common symptom:** Painless gross hematuria (found in 85% of cases). * **Standard of Diagnosis:** Cystoscopy with biopsy. * **Radical Cystectomy boundaries:** In males, it includes the bladder, prostate, and seminal vesicles. In females, it includes the bladder, urethra, uterus, ovaries, and anterior vaginal wall. * **BCG Vaccine:** Used intravesically for high-grade NMIBC (Stage T1/CIS) to prevent recurrence, but not for Stage II.

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