Urology Practice Questions

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

Sunitinib. ### 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.

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

Color Doppler. **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.

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

105 or over. ### 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.

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

Seminoma. **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.

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

Antibiotics. **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.

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

Wide excision. **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 or high grade, partial penectomy is often required.

Q: 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?

No further treatment. **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).

Question 1

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

Accepted Answer

Sunitinib

Answer

Sorafenib

Answer

Imatinib

Answer

Cetuximab

Question 2

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

Accepted Answer

Color Doppler

Answer

Angel sign

Answer

Prehn sign

Answer

MRI

Question 3

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

Accepted Answer

105 or over

Answer

100

Answer

1000

Answer

104

Question 4

Placental alkaline phosphatase is a marker of which of the following?

Accepted Answer

Seminoma

Answer

Theca cell tumor

Answer

Teratoma

Answer

Choriocarcinoma

Question 5

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

Accepted Answer

Antibiotics

Answer

Observation

Answer

Sting operation

Answer

Ureteric reimplantation

Question 6

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

Accepted Answer

Wide excision

Answer

Total Penectomy

Answer

Partial Penectomy

Answer

Emasculation

Question 7

Frozen section is/are used for all except:

Accepted Answer

Acid-fast bacilli staining

Answer

Enzyme studies

Answer

Intraoperative histopathological examination

Answer

Fat staining

Question 8

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?

Accepted Answer

Complete transurethral resection with intravesical chemotherapy

Answer

Complete transurethral resection

Answer

Palliative radiotherapy

Answer

Radical cystectomy

Question 9

Which of the following is true of blunt renal trauma?

Accepted Answer

Blunt renal trauma requires exploration only when the patient exhibits hemodynamic instability.

Answer

Blunt renal trauma and penetrating renal injuries are managed similarly.

Answer

Blunt renal trauma must be evaluated by contrast studies using either IVP or CT.

Answer

Any kidney fractured by blunt renal trauma must be explored.

Question 10

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?

Accepted Answer

No further treatment

Answer

Endocrine therapy

Answer

Radical surgery

Answer

Hormone therapy

Urology — MCQs

Urology — MCQs

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