Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 421: Which of the following is NOT an indication for circumcision?

A. Chronic balanoposthitis
B. Religious reasons (e.g., Jewish faith)
C. Carcinoma of the penis (Correct Answer)
D. Paraphimosis

Explanation: ### Explanation The correct answer is **C. Carcinoma of the penis**. **1. Why Carcinoma of the Penis is NOT an indication for circumcision:** In cases of biopsy-proven penile carcinoma, circumcision is not a definitive treatment. The management of penile cancer depends on the stage and grade of the tumor. Standard surgical treatments include **wide local excision, partial penectomy, or total penectomy** with inguinal lymph node dissection. While circumcision is a well-known **preventive measure** (it significantly reduces the risk of developing penile cancer later in life), it is not the indicated therapeutic procedure once a malignancy is established. **2. Analysis of Incorrect Options:** * **A. Chronic Balanoposthitis:** Recurrent inflammation of the glans (balanitis) and prepuce (posthitis) often leads to scarring and secondary phimosis. Circumcision is the definitive treatment to prevent recurrence. * **B. Religious Reasons:** This is a "social/ritual indication." In faiths such as Judaism (Brit Milah) and Islam, neonatal or childhood circumcision is a standard practice. * **D. Paraphimosis:** This is a urological emergency where the retracted foreskin cannot be pulled forward. While the initial management involves manual reduction or a dorsal slit, **elective circumcision** is strongly indicated afterward to prevent recurrence. **Clinical Pearls for NEET-PG:** * **Absolute Medical Indications:** Phimosis (pathological), Paraphimosis (recurrent), and Balanitis Xerotica Obliterans (BXO). * **BXO (Lichen Sclerosus):** The most common pathological cause of phimosis; circumcision is the treatment of choice. * **Protective Effect:** Circumcision reduces the risk of HIV transmission, HPV, and Urinary Tract Infections (UTIs) in infants. * **Contraindication:** Never perform circumcision in a child with **Hypospadias**, as the prepuce is required for future reconstructive surgery (urethroplasty).

Question 422: Staghorn calculus is primarily composed of which substance?

A. Magnesium ammonium phosphate (Correct Answer)
B. Calcium oxalate
C. Uric acid
D. Cysteine

Explanation: **Explanation:** **Staghorn calculus** (also known as a triple phosphate or struvite stone) is a large, branching stone that occupies the renal pelvis and extends into at least two calyces, resembling the antlers of a stag. **Why Magnesium Ammonium Phosphate is Correct:** These stones are primarily composed of **Magnesium Ammonium Phosphate (Struvite)** and calcium carbonate. They are "infection stones" caused by **urease-producing bacteria** (most commonly *Proteus mirabilis*, followed by *Klebsiella* and *Pseudomonas*). These bacteria split urea into ammonia, which increases the urinary pH (alkaline urine, pH > 7.2). In this alkaline environment, magnesium ammonium phosphate precipitates to form large, rapidly growing stones. **Analysis of Incorrect Options:** * **B. Calcium Oxalate:** This is the most common type of kidney stone overall. They are usually small, hard, and radio-opaque, but they do not typically form staghorn configurations. * **C. Uric Acid:** These stones are radiolucent (not visible on X-ray) and form in acidic urine. While they can occasionally form large stones, they are not the primary component of classic staghorn calculi. * **D. Cysteine:** These are caused by an autosomal recessive defect in amino acid transport. While they can form "partial staghorns" in children, they are much rarer than struvite stones. **High-Yield NEET-PG Pearls:** * **Microscopy:** Struvite stones show characteristic **"Coffin-lid"** crystals. * **Radiology:** They are radio-opaque (though less dense than calcium oxalate). * **Treatment:** The gold standard for staghorn calculi is **Percutaneous Nephrolithotomy (PCNL)**. * **Key Association:** Always look for a history of recurrent UTIs with alkaline urine in the clinical vignette.

Question 423: Posterior urethral valves are commonly situated where?

A. Above the verumontanum
B. At the verumontanum
C. Below the verumontanum (Correct Answer)
D. At the bladder neck

Explanation: Explanation: Posterior Urethral Valves (PUV) are the most common cause of bladder outlet obstruction in male infants. They are congenital mucosal folds within the prostatic urethra that act as a "one-way valve," obstructing the flow of urine. 1. Why "Below the verumontanum" is correct: The most common type of PUV is Type I (accounting for >95% of cases). These valves are described as sail-like membranes that originate from the distal end of the verumontanum and extend distally toward the membranous urethra. Therefore, the anatomical site of obstruction is consistently below (distal to) the verumontanum. 2. Analysis of Incorrect Options: * Above the verumontanum: This would correspond to Type II valves (folds extending from the verumontanum toward the bladder neck). However, Type II valves are now considered non-obstructive clinical variants or hypertrophy of the urethral crest rather than true valves. * At the verumontanum: While the valves originate at the distal aspect of the verumontanum, the obstructive pathology and the bulk of the membrane lie below it. * At the bladder neck: Bladder neck obstruction is a separate clinical entity (e.g., Marion’s disease). In PUV, the bladder neck is often secondary hypertrophied due to high-pressure voiding, but it is not the site of the valves. Clinical Pearls for NEET-PG: * Young's Classification: Type I is most common; Type III is a disk-like membrane distal to the verumontanum. * Classic Presentation: Poor urinary stream, palpable bladder, and bilateral hydroureteronephrosis. * Diagnosis: MCUG (Voiding Cystourethrogram) is the gold standard, showing a dilated posterior urethra and a "spinning top" appearance. * Management: Initial stabilization with a feeding tube (to drain the bladder) followed by Endoscopic Fulguration (Primary treatment). * Key Sign: "Keyhole sign" on prenatal ultrasound (dilated bladder and proximal urethra).

Question 424: BCG is used in the treatment of which carcinoma?

A. Carcinoma of the colon
B. Carcinoma of the cervix
C. Carcinoma of the urinary bladder (Correct Answer)
D. All of the above

Explanation: **Explanation:** **Bacillus Calmette-Guérin (BCG)**, a live-attenuated strain of *Mycobacterium bovis*, is the gold standard for **intravesical immunotherapy** in the management of **Non-Muscle Invasive Bladder Cancer (NMIBC)**, specifically high-grade Ta, T1, and Carcinoma in situ (CIS). **Why Option C is Correct:** When instilled into the bladder, BCG triggers a robust local immune response. It attaches to the urothelium via fibronectin and is internalized by bladder cancer cells. This induces the release of cytokines (IL-1, IL-2, IL-12, IFN-γ) and recruits T-lymphocytes, macrophages, and Natural Killer (NK) cells. These immune cells recognize and destroy the malignant cells, significantly reducing the risk of tumor recurrence and progression. **Why Other Options are Incorrect:** * **Option A & B:** While BCG is a potent immunomodulator, its clinical efficacy is localized. In systemic cancers like colon or cervical carcinoma, BCG has not shown therapeutic benefit compared to standard chemotherapy, radiotherapy, or targeted biologics. Its use is restricted to accessible mucosal surfaces where a localized inflammatory response can be safely contained. **High-Yield Clinical Pearls for NEET-PG:** * **Indications:** High-risk NMIBC (T1, high-grade Ta) and CIS. It is NOT used for muscle-invasive disease (T2 or higher). * **Timing:** Treatment usually starts 2–4 weeks after TURBT (Transurethral Resection of Bladder Tumor) to allow the bladder wall to heal, preventing systemic absorption. * **SWOG Protocol:** Standard induction involves once-weekly instillations for 6 weeks. * **Contraindications:** Gross hematuria, traumatic catheterization, immunosuppression, and active tuberculosis. * **Complication:** The most serious complication is **BCGosis** (systemic sepsis), treated with anti-tubercular drugs (excluding Pyrazinamide, as *M. bovis* is intrinsically resistant to it).

Question 425: Which of the following can invade the Inferior Vena Cava (IVC)?

A. Renal cell carcinoma (Correct Answer)
B. Breast carcinoma
C. Bladder cancer
D. Head of Pancreas cancer

Explanation: **Explanation:** **Renal Cell Carcinoma (RCC)**, specifically the clear cell subtype, is notorious for its unique propensity for **angioinvasion**. Unlike many other solid tumors that spread primarily via lymphatics, RCC frequently invades the renal vein and can extend as a "tumor thrombus" into the **Inferior Vena Cava (IVC)**. This occurs in approximately 4–10% of patients. The tumor grows intraluminally toward the right atrium, often without infiltrating the vessel wall itself, which sometimes allows for surgical resection (thrombectomy). **Why other options are incorrect:** * **Breast Carcinoma:** Primarily spreads via the lymphatic system (axillary nodes) and hematogenously to bones, lungs, and liver. It does not typically exhibit direct intraluminal venous extension. * **Bladder Cancer:** Spreads locally into the pelvic wall or via lymphatics to iliac nodes. While it can cause venous compression or deep vein thrombosis (DVT), it does not characteristically invade the IVC lumen. * **Head of Pancreas Cancer:** Known for invading the **Portal Vein** or Superior Mesenteric Vein (SMV) due to anatomical proximity, but it does not typically invade the IVC. **Clinical Pearls for NEET-PG:** * **Staging:** Extension into the renal vein or IVC below the diaphragm is classified as **T3a**; extension into the IVC above the diaphragm is **T3b/T3c**. * **Imaging:** The gold standard for assessing the cranial extent of an IVC thrombus is **MRI** (or Transesophageal Echo during surgery). * **Varicocele:** A left-sided varicocele that does not empty in the supine position is a classic sign of RCC obstructing the left renal vein. * **Other tumors invading IVC:** Wilms tumor, Adrenal cortical carcinoma, and Hepatocellular carcinoma (HCC).

Question 426: Orchitis without epididymitis is seen in which condition?

A. Gonorrhoea
B. Tuberculosis
C. Syphilis (Correct Answer)
D. Chlamydia infection

Explanation: In urology, the spread of infection to the scrotal contents typically follows a specific anatomical route. Understanding this route is key to distinguishing between different types of scrotal infections. ### **Explanation of the Correct Answer** **Syphilis (Option C)** is the correct answer because it is a classic exception to the rule of retrograde infection. In syphilis, the infection reaches the testis via a **hematogenous route** (bloodborne). Because the spirochetes seed the testicular parenchyma directly from the blood, it presents as a painless, woody hard swelling of the testis (Gumma) while the epididymis remains unaffected. This is known as a "cold" swelling of the testis. ### **Explanation of Incorrect Options** * **Gonorrhoea (Option A) and Chlamydia (Option B):** These are the most common causes of acute epididymo-orchitis in young men. The infection spreads in a **retrograde** fashion from the urethra, through the vas deferens, to the epididymis first. The testis is involved only secondarily by direct spread. Therefore, you rarely see orchitis without preceding epididymitis. * **Tuberculosis (Option B):** Renal TB typically spreads via the urine to the prostate and then via the vas deferens to the **epididymis**. In TB, the epididymis is the primary site of involvement (often starting at the tail), and the testis is involved only in late, advanced stages. ### **High-Yield Clinical Pearls for NEET-PG** * **Mumps:** The most common cause of **isolated viral orchitis**. Like syphilis, it spreads hematogenously and spares the epididymis. * **Prehn’s Sign:** Positive (relief of pain with scrotal elevation) in epididymo-orchitis; negative in testicular torsion. * **Rule of Thumb:** If the infection is **hematogenous** (Syphilis, Mumps), it is primarily **Orchitis**. If the infection is **retrograde/ascending** (Gonorrhoea, Chlamydia, TB), it is primarily **Epididymitis**.

Question 427: Alkalinization of urine helps in the dissolution of which types of renal stones?

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

Explanation: **Explanation:** The solubility of certain renal stones is highly dependent on urinary pH. **Uric acid stones** form in acidic urine (pH < 5.5). When the urine is alkalinized (target pH 6.5–7.0) using agents like potassium citrate or sodium bicarbonate, the uric acid is converted into its more soluble urate salt form. This increases its solubility by nearly 10-fold, allowing for the medical dissolution of existing stones and the prevention of new ones. **Analysis of Options:** * **Calcium oxalate (A):** These are the most common renal stones. Their formation is largely independent of urinary pH, and they cannot be dissolved by altering pH levels. * **Cystine (C):** While cystine solubility does increase with alkalinization, it requires a very high pH (>7.5) which is difficult to maintain and increases the risk of calcium phosphate precipitation. While alkalinization is used for *prevention*, it is less effective for *dissolution* compared to uric acid. * **Struvite (D):** Also known as "triple phosphate" or infection stones, these form in **alkaline** urine caused by urease-producing bacteria (e.g., *Proteus*). Alkalinization would worsen these stones; they require acidification for management. **High-Yield Clinical Pearls for NEET-PG:** * **Uric acid stones** are characteristically **radiolucent** on X-ray (KUB) but visible on NCCT (attenuation <500 HU). * **Potassium citrate** is the preferred alkalinizing agent because it also provides citrate, a potent inhibitor of calcium stone formation. * **Pure Uric Acid stones** are the only major stone type that can be completely dissolved with medical therapy (Chemolysis). * **Struvite stones** are associated with a "Staghorn" appearance and a high urinary pH (>7.2).

Question 428: Which of the following structures is not affected by Gonococcus?

A. Urethra
B. Testis (Correct Answer)
C. Prostate
D. Seminal vesicle

Explanation: **Explanation:** The correct answer is **Testis (Option B)**. This is a classic high-yield fact in urogenital pathology. **1. Why the Testis is spared:** *Neisseria gonorrhoeae* primarily infects surfaces lined with **columnar or cuboidal epithelium**. While it frequently involves the entire male reproductive tract via ascending infection, it typically stops at the **epididymis**. The testis possesses a robust blood-testis barrier and a distinct immunological environment that makes it resistant to direct gonococcal invasion. Therefore, while Gonococcus causes **acute epididymitis**, it rarely, if ever, causes orchitis. If a patient presents with "epididymo-orchitis," the orchitis component is usually due to secondary inflammation or other pathogens (like Mumps or *E. coli*), not the Gonococcus itself. **2. Why other options are incorrect:** * **Urethra (Option A):** The most common site of infection. Gonococcus causes "Gonococcal Urethritis," characterized by a profuse, purulent yellow discharge. * **Prostate (Option C):** Ascending infection frequently involves the prostatic ducts, leading to acute or chronic gonococcal prostatitis. * **Seminal Vesicle (Option D):** The infection can easily spread from the ejaculatory ducts to the seminal vesicles, causing seminal vesiculitis. **Clinical Pearls for NEET-PG:** * **Epididymitis vs. Orchitis:** In young, sexually active men (<35 years), the most common cause of epididymitis is *N. gonorrhoeae* and *C. trachomatis*. In older men (>35 years), it is usually *E. coli*. * **Prehn’s Sign:** Positive (relief of pain with scrotal elevation) in epididymitis; negative in testicular torsion. * **Treatment:** The current CDC recommendation for uncomplicated gonococcal urethritis is a single IM dose of **Ceftriaxone** (500 mg). Always co-treat for Chlamydia (Doxycycline) unless ruled out.

Question 429: What is the most common cause of altered sensorium post-TURP?

A. Hypernatremia
B. Hypokalemia
C. Hyponatremia (Correct Answer)
D. Hypomagnesemia

Explanation: **Explanation:** The most common cause of altered sensorium following Transurethral Resection of the Prostate (TURP) is **Hyponatremia**, specifically Dilutional Hyponatremia. This occurs as a component of **TURP Syndrome**. During the procedure, large volumes of non-conductive irrigation fluids (traditionally Glycine 1.5%, Mannitol, or Sorbitol) are used. These fluids can be absorbed into the systemic circulation through opened prostatic venous sinuses. This leads to intravascular volume expansion and the dilution of serum sodium levels. When serum sodium drops rapidly, it causes cerebral edema, leading to neurological symptoms such as confusion, agitation, seizures, and altered sensorium. **Analysis of Options:** * **A. Hypernatremia:** This is incorrect. TURP involves the absorption of hypotonic or isotonic salt-free fluids, which dilutes sodium rather than concentrating it. * **B. Hypokalemia:** While fluid shifts can occasionally affect potassium, it is not the primary or most common cause of neurological changes in this setting. * **D. Hypomagnesemia:** This is unrelated to the pathophysiology of TURP syndrome or the irrigation fluids used. **Clinical Pearls for NEET-PG:** * **TURP Syndrome Triad:** Hypertension (early), Bradycardia, and Altered Mental Status. * **Glycine Toxicity:** If glycine is used, it can be metabolized into **Ammonia** (causing encephalopathy) and **Glycine** itself (acting as an inhibitory neurotransmitter in the retina, leading to transient blindness). * **Management:** Treatment of severe symptomatic hyponatremia involves **Hypertonic Saline (3% NaCl)** and diuretics (Furosemide). * **Prevention:** The use of **Bipolar TURP** allows for Normal Saline (0.9% NaCl) irrigation, significantly reducing the risk of hyponatremia.

Question 430: Testicular cancer is common in patients with which of the following conditions?

A. Ectopic testis
B. Undescended abdominal testis (Correct Answer)
C. Atrophic testis
D. Anteverted testis

Explanation: **Explanation:** The strongest risk factor for testicular germ cell tumors (GCT) is **cryptorchidism** (undescended testis). The risk is significantly higher in an **abdominal testis** compared to an inguinal testis. **1. Why Option B is Correct:** The risk of malignancy in an undescended testis is roughly **4 to 10 times** higher than in the general population. The higher the position of the undescended testis, the greater the risk; hence, an **abdominal testis** carries the highest risk (approx. 1 in 20 chance of malignancy). The increased core body temperature and dysgenetic changes in the germ cells are thought to contribute to carcinogenesis. Notably, orchiopexy performed after puberty does not reduce the risk of cancer, but it allows for easier clinical surveillance. **2. Analysis of Incorrect Options:** * **A. Ectopic testis:** While an ectopic testis is outside the scrotum, it has usually passed through the inguinal canal and is located in a superficial pouch. While it carries a risk, the relative risk is lower than that of a true intra-abdominal undescended testis. * **C. Atrophic testis:** While atrophy (due to mumps or trauma) can be associated with a slight increase in risk, it is not as statistically significant or classically associated as cryptorchidism. * **D. Anteverted testis:** This is a normal anatomical variation where the testis is rotated; it has no association with malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common tumor in undescended testis:** Seminoma. * **Most common tumor after orchiopexy:** Seminoma. * **Contralateral Risk:** 5–10% of patients with a history of cryptorchidism develop a tumor in the **contralateral normally descended testis**. * **Best time for Orchiopexy:** Ideally between 6 to 12 months of age to preserve fertility, though it may not eliminate the baseline cancer risk.

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