Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 901: What is the drug of choice for surgically unresectable renal cell carcinoma?

A. Sorafenib
B. Sunitinib (Correct Answer)
C. Imatinib
D. Cetuximab

Explanation: ### Explanation **Correct Answer: B. Sunitinib** **Medical Concept:** Renal Cell Carcinoma (RCC) is a highly vascular tumor characterized by the overexpression of **Vascular Endothelial Growth Factor (VEGF)**, often due to mutations in the *VHL* (von Hippel-Lindau) gene. For metastatic or surgically unresectable RCC, traditional chemotherapy and radiotherapy are largely ineffective. The mainstay of treatment is **Targeted Therapy**. **Sunitinib** is a multi-targeted tyrosine kinase inhibitor (TKI) that inhibits VEGF receptors (VEGFR) and Platelet-Derived Growth Factor receptors (PDGFR). It has historically been the first-line drug of choice for advanced/metastatic clear cell RCC because it inhibits the angiogenesis that drives tumor growth. **Analysis of Incorrect Options:** * **A. Sorafenib:** While also a TKI used in RCC, it is generally considered a second-line agent or used when Sunitinib is not tolerated. It is more commonly associated with Hepatocellular Carcinoma (HCC). * **C. Imatinib:** This TKI specifically targets BCR-ABL, c-KIT, and PDGFR. It is the drug of choice for **Chronic Myeloid Leukemia (CML)** and **Gastrointestinal Stromal Tumors (GIST)**, not RCC. * **D. Cetuximab:** This is a monoclonal antibody against **EGFR**. It is used in Colorectal Cancer and Head and Neck Squamous Cell Carcinoma, but has no role in the management of RCC. **High-Yield Clinical Pearls for NEET-PG:** * **Most common histological type:** Clear cell RCC (80%). * **First-line for Metastatic RCC:** Sunitinib or Pazopanib. (Note: Recent guidelines also include immunotherapy combinations like Axitinib + Pembrolizumab). * **Common Side Effect of Sunitinib:** Hand-foot syndrome, hypertension, and fatigue. * **Interleukin-2 (IL-2):** Previously used as immunotherapy but now largely replaced due to high toxicity. * **Temsirolimus:** An mTOR inhibitor used specifically for "poor prognosis" metastatic RCC.

Question 902: A male patient presents with acute scrotal pain. Which investigation is most effective in differentiating between testicular torsion and epididymo-orchitis?

A. Angel sign
B. Prehn sign
C. Color Doppler (Correct Answer)
D. MRI

Explanation: **Explanation:** The clinical differentiation between **testicular torsion** (a surgical emergency) and **epididymo-orchitis** (an inflammatory condition) is critical. The gold standard imaging modality for this purpose is **Color Doppler Ultrasonography (CDUS)**. 1. **Why Color Doppler is Correct:** The underlying pathophysiology differs significantly in terms of vascularity. In **testicular torsion**, the twisting of the spermatic cord leads to ischemia, appearing as **absent or decreased blood flow** on Doppler. In contrast, **epididymo-orchitis** is an inflammatory process characterized by hyperemia, showing **increased blood flow** to the testis and epididymis. CDUS has a high sensitivity (82-100%) and specificity (88-100%) for this distinction. 2. **Why other options are incorrect:** * **Angel sign:** This refers to the horizontal lie of the contralateral testis in a patient with torsion. While a useful clinical observation, it is not a definitive "investigation." * **Prehn sign:** This is a physical exam finding where pain is relieved by elevating the scrotum (suggestive of epididymitis) but not in torsion. However, it is notoriously **unreliable** and cannot be used to rule out torsion. * **MRI:** While highly accurate, MRI is time-consuming, expensive, and not readily available in emergency settings. Since "time is muscle" in torsion (6-hour golden window), MRI is not the investigation of choice. **Clinical Pearls for NEET-PG:** * **Golden Window:** Testicular salvage rates are >90% if detorsion occurs within 6 hours, dropping to <10% after 24 hours. * **Management:** If clinical suspicion for torsion is very high, do not delay surgery for imaging; proceed directly to **emergency scrotal exploration**. * **Radionuclide Scan:** Historically used to show "cold spots" in torsion, but largely replaced by Doppler due to availability.

Question 903: What bacterial count in a midstream urine specimen indicates a urinary tract infection?

A. 100
B. 1000
C. 104
D. 105 or over (Correct Answer)

Explanation: ### Explanation The diagnosis of a Urinary Tract Infection (UTI) is traditionally based on the concept of **significant bacteriuria**, a term coined by Edward Kass. **1. Why "10⁵ or over" is correct:** For a **midstream urine (MSU)** specimen, a bacterial count of **≥10⁵ colony-forming units (CFU)/mL** of a single pathogenic species is the standard diagnostic threshold. This value was established to distinguish true infection from urethral contamination. At this concentration, the probability of a genuine UTI is over 80%, whereas lower counts in asymptomatic patients often represent contamination during voiding. **2. Why other options are incorrect:** * **100 (10²) and 1000 (10³):** These counts are generally considered insignificant in a standard MSU sample. However, they may be clinically relevant in specific scenarios, such as symptomatic young women with cystitis or samples obtained via **suprapubic aspiration** (where any growth is significant). * **10⁴:** This is often considered a "gray zone." While it may indicate an early infection or a partially treated UTI, it does not meet the classic criteria for significant bacteriuria in a routine MSU screening. **3. High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Collection:** Suprapubic aspiration is the most sterile method; any bacterial growth here is diagnostic of UTI. * **Kass Criteria:** Specifically applies to asymptomatic patients. In **symptomatic** patients, the threshold is often lowered to **10²–10³ CFU/mL** for diagnosis. * **Sterile Pyuria:** Presence of pus cells (>10/hpf) but no growth on standard culture. Common causes include Renal TB (most common in exams), treated UTI, or Urolithiasis. * **Most Common Organism:** *E. coli* remains the leading cause of both community and hospital-acquired UTIs.

Question 904: Placental alkaline phosphatase is a marker of which of the following?

A. Theca cell tumor
B. Teratoma
C. Choriocarcinoma
D. Seminoma (Correct Answer)

Explanation: **Explanation:** **Seminoma** is the correct answer because **Placental Alkaline Phosphatase (PLAP)** is a highly sensitive, characteristic biochemical marker for this specific germ cell tumor (GCT). PLAP is an isoenzyme normally produced by the placenta; however, it is expressed by the primitive germ cells in seminomas (and its ovarian counterpart, Dysgerminoma). While PLAP is elevated in nearly 50–90% of seminoma cases, it is not used for monitoring treatment response as effectively as other markers due to its lack of specificity (e.g., it can be elevated in smokers). **Analysis of Incorrect Options:** * **Theca cell tumor:** This is a sex cord-stromal tumor of the ovary, typically associated with estrogen production, not PLAP. * **Teratoma:** These are composed of mature or immature tissues from multiple germ layers. They typically do not produce specific serum markers like PLAP, hCG, or AFP (unless mixed with other components). * **Choriocarcinoma:** The hallmark marker for choriocarcinoma is **beta-hCG**. While some overlap exists in mixed GCTs, PLAP is not the primary diagnostic marker for pure choriocarcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Seminoma Markers:** PLAP is the most specific. **hCG** may be elevated in 10–15% of cases (due to syncytiotrophoblastic giant cells), but **AFP is never elevated** in a pure seminoma. * **Yolk Sac Tumor:** Characterized by markedly elevated **AFP** and Schiller-Duval bodies. * **Dysgerminoma:** The female equivalent of seminoma; also expresses **PLAP** and LDH. * **Smoking Fact:** Serum PLAP levels can be physiologically elevated in heavy smokers, which can lead to false positives in clinical screening.

Question 905: A child with vesicoureteric reflux of grade 2 presents to the outpatient department. What is the preferred treatment method?

A. Antibiotics (Correct Answer)
B. Observation
C. Sting operation
D. Ureteric reimplantation

Explanation: **Explanation:** Vesicoureteric Reflux (VUR) is the retrograde flow of urine from the bladder into the ureter. The management of VUR is primarily determined by the **Grade of Reflux** (International Classification I-V) and the presence of symptoms. **Why Antibiotics is the Correct Answer:** For **Low-grade VUR (Grades I and II)**, the standard of care is **Medical Management** with Continuous Antibiotic Prophylaxis (CAP). The underlying concept is that low-grade reflux has a high rate of **spontaneous resolution** as the child grows and the ureterovesical junction matures. Antibiotics (e.g., Trimethoprim-Sulfamethoxazole or Nitrofurantoin) are used to maintain sterile urine and prevent recurrent Urinary Tract Infections (UTIs), thereby protecting the kidneys from pyelonephritis and scarring while waiting for resolution. **Analysis of Incorrect Options:** * **Observation:** While some modern protocols debate the necessity of CAP in toilet-trained children without infections, the standard textbook management for a child presenting with VUR remains antibiotic prophylaxis to prevent renal damage. * **Sting Operation (Sub-ureteric Teflon/Deflux Injection):** This is a minimally invasive endoscopic procedure reserved for Grade III-IV reflux or cases where medical management fails. * **Ureteric Reimplantation:** This is a surgical intervention (e.g., Cohen’s or Politano-Leadbetter technique) indicated for **High-grade VUR (Grades IV and V)**, bilateral reflux, or failure of medical therapy. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Voiding Cystourethrogram (VCUG/MCU). * **Initial Investigation for UTI in children:** Ultrasound (to look for hydronephrosis). * **Most common cause of secondary VUR:** Posterior Urethral Valves (PUV). * **Indication for Surgery:** Breakthrough UTIs despite antibiotics, non-compliance, or Grade V reflux with scarring.

Question 906: What is the treatment of choice for small preputial penile carcinoma?

A. Total Penectomy
B. Partial Penectomy
C. Wide excision (Correct Answer)
D. Emasculation

Explanation: **Explanation:** The management of penile carcinoma is primarily determined by the stage and location of the tumor. For **small, localized tumors involving the prepuce (foreskin)**, the goal is organ preservation without compromising oncological safety. **Why Wide Excision is Correct:** In cases where the malignancy is confined to the prepuce (Stage Tis, Ta, or T1), a **wide local excision** (often in the form of a radical circumcision) is the treatment of choice. This approach ensures a negative surgical margin (historically 2cm, though current guidelines suggest 3–5mm is often sufficient) while preserving the glans and penile shaft, maintaining sexual and urinary function. **Why Other Options are Incorrect:** * **Partial Penectomy:** This is indicated for larger T1 or T2 tumors involving the glans or distal shaft where a 1–2 cm margin cannot be achieved by local excision alone. It is too aggressive for a small preputial lesion. * **Total Penectomy:** Reserved for T3 or T4 tumors where the proximal shaft is involved, and a functional stump cannot be preserved. * **Emasculation:** This is an ultra-radical procedure involving total penectomy, orchiectomy, and scrotal ablation, reserved for extensive, locally advanced disease or palliative care. **Clinical Pearls for NEET-PG:** * **Most common histological type:** Squamous Cell Carcinoma (95%). * **Risk Factors:** Phimosis (most significant), HPV 16/18, and smoking. * **Sentinel Lymph Node:** The first site of metastasis is the **Inguinal Lymph Nodes**. * **Staging Tip:** If the tumor is <2cm and low grade, organ-sparing surgery (like wide excision or laser) is preferred. If >2cm or high grade, partial penectomy is often required.

Question 907: Frozen section is/are used for all except:

A. Enzyme studies
B. Intraoperative histopathological examination
C. Fat staining
D. Acid-fast bacilli staining (Correct Answer)

Explanation: **Explanation:** The **Frozen Section** is a rapid intraoperative technique where tissue is snap-frozen (usually using liquid nitrogen or a cryostat) to allow for immediate microscopic evaluation. **Why Acid-fast bacilli (AFB) staining is the correct answer:** AFB staining (like Ziehl-Neelsen) is used to detect *Mycobacterium tuberculosis*. This process requires heat-fixing the smear and specific chemical reagents that do not necessitate the rapid preservation of cellular morphology or labile substances provided by freezing. AFB can be easily identified using conventional formalin-fixed, paraffin-embedded (FFPE) sections or direct smears. Therefore, frozen sections are not indicated for AFB staining. **Analysis of Incorrect Options:** * **Enzyme Studies (A):** Many enzymes are denatured by the heat and chemicals used in routine paraffin processing. Frozen sections preserve enzyme activity, making them the gold standard for enzyme histochemistry (e.g., in muscle biopsies). * **Intraoperative Histopathological Examination (B):** This is the primary clinical use of frozen sections. It allows surgeons to determine margin status (e.g., in urological malignancies like RCC or bladder cancer) or identify unknown pathology while the patient is still on the operating table. * **Fat Staining (C):** Lipids are dissolved by the alcohols and xylenes used in routine paraffin embedding. To demonstrate fat (using stains like Oil Red O or Sudan Black), frozen sections must be used to keep the lipids intact within the tissue. **NEET-PG High-Yield Pearls:** * **Cryostat temperature:** Usually maintained at **-20°C to -30°C**. * **Main Indication:** Rapid diagnosis and assessment of surgical margins. * **Contraindication:** Calcified tissues (cannot be cut by cryostat) and large bulky specimens. * **Mohs Micrographic Surgery:** A specialized urological/dermatological application of frozen sections used to ensure complete margin clearance in penile or skin cancers.

Question 908: A 70-year-old male chronic smoker is diagnosed with cancer of the urinary bladder, confined to the trigone with extension up to the submucosa. What is the recommended management?

A. Complete transurethral resection
B. Complete transurethral resection with intravesical chemotherapy (Correct Answer)
C. Palliative radiotherapy
D. Radical cystectomy

Explanation: ### Explanation The management of bladder cancer is primarily determined by the **stage of the disease**, specifically whether it is Non-Muscle Invasive Bladder Cancer (NMIBC) or Muscle Invasive Bladder Cancer (MIBC). **1. Why Option B is Correct:** The patient has cancer confined to the **submucosa (Stage T1)**. Since it has not invaded the muscularis propria (detrusor muscle), it is classified as **NMIBC**. The standard of care for NMIBC is a **Transurethral Resection of Bladder Tumor (TURBT)** to remove all visible lesions, followed by **intravesical therapy** (chemotherapy like Mitomycin C or immunotherapy like BCG). Intravesical therapy is crucial because it reduces the high risk of recurrence and progression associated with T1 lesions and high-grade tumors. **2. Why Other Options are Incorrect:** * **Option A:** TURBT alone is insufficient. Without adjuvant intravesical therapy, NMIBC has a recurrence rate of up to 70%. * **Option C:** Palliative radiotherapy is reserved for advanced, metastatic, or inoperable cases to control symptoms like hematuria and pain. It is not a primary treatment for localized T1 disease. * **Option D:** Radical cystectomy is the gold standard for **Muscle Invasive Bladder Cancer (Stage T2 and above)**. While it may be considered for "very high-risk" NMIBC that fails intravesical therapy, it is not the immediate first-line recommendation for a standard T1 diagnosis. **Clinical Pearls for NEET-PG:** * **Staging:** Ta (mucosa), T1 (submucosa/lamina propria), T2 (muscularis propria), T3 (perivesical fat), T4 (adjacent organs). * **Most common histological type:** Urothelial (Transitional Cell) Carcinoma (>90%). * **Risk Factors:** Smoking (most common), aromatic amines (dye/rubber industry), and *Schistosoma haematobium* (associated specifically with Squamous Cell Carcinoma). * **Gold Standard Diagnosis:** Cystoscopy with biopsy.

Question 909: Which of the following is true of blunt renal trauma?

A. Blunt renal trauma and penetrating renal injuries are managed similarly.
B. Blunt renal trauma must be evaluated by contrast studies using either IVP or CT.
C. Blunt renal trauma requires exploration only when the patient exhibits hemodynamic instability. (Correct Answer)
D. Any kidney fractured by blunt renal trauma must be explored.

Explanation: ### Explanation **Core Concept:** The management of blunt renal trauma has shifted significantly toward **non-operative management (NOM)**. The kidney is a highly vascular organ, but most blunt injuries (Grades I-III and many Grade IV) are self-limiting. The primary indication for surgical exploration in blunt trauma is **hemodynamic instability** refractory to resuscitation, which suggests an expanding or pulsatile hematoma or a major pedicle injury. **Analysis of Options:** * **Option C (Correct):** In blunt trauma, even high-grade injuries (Grade IV/V) are managed conservatively if the patient is stable. Exploration is reserved for instability, as premature surgery often leads to unnecessary nephrectomy. * **Option A (Incorrect):** Penetrating injuries (gunshot/stab) have a much higher incidence of associated visceral injuries and ureteral/pelvic damage, often requiring a lower threshold for surgical intervention compared to blunt trauma. * **Option B (Incorrect):** Not *all* blunt trauma requires imaging. Evaluation is indicated only if there is **gross hematuria** or **microscopic hematuria with hypotension** (SBP <90 mmHg). Stable patients with isolated microscopic hematuria do not require CT. * **Option D (Incorrect):** A "fractured" kidney (Grade IV) with a parenchymal laceration extending into the collecting system is successfully managed conservatively in over 90% of stable cases. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Contrast-Enhanced CT (CECT) is the imaging of choice for stable patients. * **Absolute Indications for Surgery:** Hemodynamic instability, expanding/pulsatile retroperitoneal hematoma. * **Relative Indications:** Urinary extravasation, non-viable tissue (>20%), or arterial thrombosis. * **Grading:** AAST (American Association for the Surgery of Trauma) scale is used; Grade V represents a shattered kidney or renal pedicle avulsion.

Question 910: An 85-year-old man underwent transurethral resection of the prostate. Histological examination of his specimen showed T1a stage adenocarcinoma. What is the appropriate management?

A. Endocrine therapy
B. Radical surgery
C. Hormone therapy
D. No further treatment (Correct Answer)

Explanation: **Explanation:** The management of prostate cancer is determined by the stage, grade, and the patient's life expectancy. In this scenario, the patient has **Stage T1a adenocarcinoma** and is **85 years old**. **1. Why "No further treatment" is correct:** * **Stage T1a Definition:** This is an incidental histological finding where the tumor involves **≤ 5% of the resected tissue** (usually following a TURP for presumed BPH). * **Prognosis & Age:** T1a tumors are typically low-grade and slow-growing. In an 85-year-old patient, the life expectancy is likely less than 10 years. Since the risk of disease progression is extremely low and the patient is more likely to die *with* the cancer than *of* it, the standard of care is **watchful waiting** or no further treatment. **2. Why other options are incorrect:** * **Radical Surgery (Radical Prostatectomy):** This is generally reserved for patients with a life expectancy of >10 years and higher-stage localized disease (T1b, T2). In an 85-year-old, the morbidity of surgery outweighs any potential survival benefit. * **Endocrine/Hormone Therapy:** These are synonymous and involve Androgen Deprivation Therapy (ADT). This is indicated for metastatic disease (Stage N+ or M+) or as an adjunct to radiotherapy in high-risk localized cases. It is not indicated for incidental T1a disease. **Clinical Pearls for NEET-PG:** * **T1a:** Incidental finding in ≤ 5% of tissue. * **T1b:** Incidental finding in > 5% of tissue. * **T1c:** Identified by needle biopsy (usually due to elevated PSA). * **Management Rule:** For T1a, if the patient is elderly/comorbid, observe. If the patient is young (life expectancy >10 years), consider follow-up or radical treatment. * **Most common site of Prostate Cancer:** Peripheral zone (unlike BPH, which occurs in the Transition zone).

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