Urology Practice Questions

Q: Which of the following is the most appropriate cause of urinary stone formation?

High urinary oxalate. ### Explanation Urinary stone formation (urolithiasis) is a complex process involving the supersaturation of urine with stone-forming salts and a deficiency of crystallization inhibitors. **Why "High Urinary Oxalate" is Correct:** Hyperoxaluria is a potent risk factor for the formation of **Calcium Oxalate** stones, the most common type of renal calculi (approx. 80%). Oxalate is a stronger promoter of crystallization than calcium; even a small increase in urinary oxalate levels significantly increases the ion activity product of calcium oxalate, leading to crystal nucleation and growth. Common causes include dietary intake (spinach, nuts), enteric hyperoxaluria (malabsorption syndromes like Crohn’s disease), or primary genetic defects. **Analysis of Incorrect Options:** * **Low urinary Mg:** While Magnesium is a known **inhibitor** of stone formation (it binds to oxalate to form soluble magnesium oxalate), "High urinary oxalate" is a more direct and potent "cause" or promoter of the most common stone type compared to isolated low magnesium. * **Low urinary sodium:** This is actually **protective**. High urinary sodium (Hypernatriuria) promotes stone formation by increasing urinary calcium excretion (hypercalciuria) and decreasing urinary citrate (an inhibitor). * **High urinary chloride:** Urinary chloride levels do not have a direct, significant role in the pathophysiology of stone nucleation compared to oxalate or calcium. **Clinical Pearls for NEET-PG:** * **Most common stone:** Calcium Oxalate (specifically Calcium Oxalate Monohydrate/Whewellite). * **Most common metabolic abnormality:** Idiopathic Hypercalciuria. * **Most potent inhibitor:** Urinary **Citrate** (hypocitraturia is a major risk factor). * **Dietary Advice:** Patients with calcium stones should **not** restrict calcium; instead, they should restrict sodium and oxalate, as low calcium intake paradoxically increases oxalate absorption.

Q: Undescended testis increases the risk of which cancer?

Seminoma. **Explanation:** **Undescended Testis (Cryptorchidism)** is a significant risk factor for the development of testicular germ cell tumors (GCTs). The risk is approximately 4 to 10 times higher than in the general population. **Why Seminoma is the Correct Answer:** Among patients with a history of cryptorchidism, **Seminoma** is the most common histological subtype encountered. The underlying pathophysiology involves the failure of gonocytes to differentiate into spermatogonia due to the higher core body temperature in the inguinal canal or abdomen, leading to malignant transformation. Even after surgical correction (orchiopexy), the risk of malignancy remains higher than in the general population, though orchiopexy performed before puberty significantly reduces this risk and allows for easier clinical screening. **Why Other Options are Incorrect:** * **Teratoma:** While a type of non-seminomatous germ cell tumor (NSGCT), it is not the most common association with undescended testis. * **Yolk Sac Tumor:** This is the most common testicular tumor in infants and young children (pre-pubertal), but it is not specifically linked as the primary malignancy arising from cryptorchidism. * **Lymphoma:** This is the most common testicular tumor in men over the age of 60. It is a systemic malignancy rather than a primary germ cell tumor related to developmental descent. **Clinical Pearls for NEET-PG:** * **Location Risk:** The higher the position of the undescended testis (e.g., abdominal vs. inguinal), the higher the risk of malignancy. * **Contralateral Risk:** There is a small but significant risk (approx. 10%) of developing a tumor in the contralateral, normally descended testis. * **Best Time for Surgery:** Current guidelines recommend orchiopexy between **6 to 12 months** of age to preserve fertility and reduce the risk of malignancy. * **Most Common Site:** The most common site for an undescended testis is the **inguinal canal**.

Q: What is the most common congenital urethral abnormality?

Hypospadias. **Explanation:** **Hypospadias** is the most common congenital anomaly of the urethra, occurring in approximately **1 in 200 to 1 in 300 male births**. It is characterized by the failure of the urethral folds to fuse completely, resulting in the urethral meatus opening on the ventral (underside) aspect of the penis, anywhere from the glans to the perineum. It is frequently associated with **chordee** (ventral curvature) and a **hooded prepuce** (deficient ventral foreskin). **Analysis of Options:** * **Meatal Stenosis (Option A):** While common, it is most often an **acquired** condition following neonatal circumcision (due to ammoniacal dermatitis) rather than a primary congenital abnormality. * **Epispadias (Option C):** This is a rare malformation (1 in 117,000 males) where the urethra opens on the **dorsal** aspect of the penis. It is often associated with the bladder exstrophy complex. * **Diverticula (Option D):** Congenital urethral diverticula are extremely rare and usually occur in the posterior urethra or as a result of a wide-mouthed syringocele. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Hypospadias:** Ectopic urethral meatus (ventral), Chordee, and Hooded prepuce. * **Contraindication:** Circumcision is **strictly contraindicated** in these infants because the preputial skin is required for future surgical reconstruction (urethroplasty). * **Most Common Site:** Glandular/Sub-coronal (Distal hypospadias). * **Associated Anomalies:** Cryptorchidism (undescended testis) and inguinal hernias are the most common associated conditions. If a patient has hypospadias and undescended testes, an intersex disorder (DSD) should be suspected.

Q: A 25-year-old male presents with a red, swollen testis. Upon examination, the testis is felt separate from the epididymis due to marked swelling in the epididymis. What is the diagnosis?

Epididymo-orchitis. ### Explanation **Correct Answer: C. Epididymo-orchitis** The clinical presentation of a red, swollen testis where the **epididymis is felt separate from the testis** (due to localized inflammation/swelling of the epididymis) is a classic sign of early **Epididymo-orchitis**. In this condition, inflammation typically begins in the epididymis (epididymitis) before spreading to the body of the testis (orchitis). The presence of inflammatory signs (redness, warmth, swelling) and the anatomical distinction between the two structures help differentiate it from other acute scrotal pathologies. **Why other options are incorrect:** * **Testicular Torsion:** This is a surgical emergency. In torsion, the anatomy becomes distorted; the testis is usually high-riding with a horizontal lie. A key differentiator is **Prehn’s sign**: elevation of the scrotum relieves pain in epididymitis but worsens it in torsion. * **Fournier’s Gangrene:** This is a necrotizing fasciitis of the perineum. It presents with systemic sepsis, crepitus, and black eschar (gangrene) of the scrotal skin, rather than localized swelling of the epididymis. * **Testicular Cancer:** Usually presents as a **painless**, hard, heavy lump. It does not typically present with acute inflammatory signs like redness or warmth unless there is associated hemorrhage. **NEET-PG High-Yield Pearls:** * **Age Factor:** In men 35 years, it is usually *E. coli* associated with UTI or BPH. * **Prehn’s Sign:** Positive (pain relief on elevation) in Epididymo-orchitis; Negative in Torsion. * **Phren's Sign vs. Angel's Sign:** Angel's sign (horizontal lie) is seen in torsion. * **Investigation of Choice:** Color Doppler Ultrasound (shows **increased blood flow** in epididymitis, but **decreased/absent flow** in torsion).

Q: What is the commonest cause of ureteric injury during surgical operations?

Hysterectomy. **Explanation:** Ureteric injury is a significant complication of pelvic and abdominal surgeries. **Hysterectomy** (Option B) is the most common cause, accounting for over 50–70% of all iatrogenic ureteric injuries. This high incidence is due to the close anatomical proximity of the ureter to the female reproductive organs. The most vulnerable site is where the ureter passes **under the uterine artery** ("water under the bridge") near the level of the internal os. Injury typically occurs during clamping of the uterine vessels or during the closure of the vaginal vault. **Analysis of Incorrect Options:** * **Abdomino-perineal resection (Option A) & Colectomy (Option D):** While colorectal surgeries are the second most common cause of ureteric injury, they occur less frequently than gynecological procedures. In these cases, the left ureter is more commonly injured during the mobilization of the sigmoid colon or ligation of the inferior mesenteric artery. * **Prostatectomy (Option C):** Ureteric injury is rare during prostatectomy because the ureters enter the bladder trigone superior to the surgical field of the prostate. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of injury:** The lower third of the ureter (pelvic segment). * **Most common mechanism:** Crushing (clamping) or ligation; less commonly transection or thermal injury. * **Gold standard for diagnosis:** Intravenous Urogram (IVU) or CT Urogram. * **Intraoperative detection:** If suspected, intravenous **indigo carmine** or methylene blue can be administered to check for dye leakage. * **Management:** If detected intraoperatively, primary repair (ureteroureterostomy) or ureteric reimplantation (ureteroneocystostomy) is performed depending on the site of injury.

Q: Which is the site for urine extravasation in an extraperitoneal bladder rupture?

Prevesical region. **Explanation:** Bladder rupture is categorized into extraperitoneal and intraperitoneal types, usually resulting from blunt trauma associated with pelvic fractures. **1. Why Option A is correct:** In an **extraperitoneal bladder rupture** (the most common type, ~80%), the tear occurs in the anterolateral wall or the bladder neck. The urine leaks into the **Prevesical space (Space of Retzius)**, which is the potential space between the pubic symphysis and the bladder. On imaging (Cystogram), this appears as a characteristic "sunburst" or "flame-shaped" extravasation of contrast confined to the pelvis. **2. Why other options are incorrect:** * **Option B (Groin):** While urine can occasionally track toward the inguinal canal in severe pelvic injuries, it is not the primary or diagnostic site of extravasation for extraperitoneal rupture. * **Option C (Paracolic gutter):** This is a feature of **intraperitoneal bladder rupture**. In intraperitoneal tears (usually at the dome), urine enters the peritoneal cavity and flows along the paracolic gutters, outlining bowel loops on a cystogram. **Clinical Pearls for NEET-PG:** * **Mechanism:** Extraperitoneal rupture is almost always associated with **pelvic fractures** (bony spicules piercing the bladder). Intraperitoneal rupture occurs due to a blow to a **full bladder**. * **Management:** Most extraperitoneal ruptures are managed **conservatively** with a percutaneous or urethral catheter for 10–14 days. Intraperitoneal ruptures require **emergency surgical repair**. * **Gold Standard Investigation:** Retrograde Cystography (showing "flame-shaped" extravasation for extraperitoneal and "contrast outlining bowel" for intraperitoneal).

Q: Which of the following is NOT an obstructive cause of acute renal failure?

Duplex ureter. **Explanation:** Acute Renal Failure (ARF), or Acute Kidney Injury (AKI), can be classified into pre-renal, intrinsic renal, and post-renal (obstructive) causes. Post-renal ARF occurs when there is a physical blockage to the flow of urine, leading to increased retrograde pressure and decreased GFR. **Why Duplex Ureter is the correct answer:** A **Duplex Ureter** is a congenital anatomical variation where the kidney has two separate ureters. While it can be associated with complications like vesicoureteral reflux (VUR) or ureteroceles, the presence of a double ureter itself does **not** cause obstruction or renal failure. It is an anatomical anomaly rather than an obstructive pathology. **Analysis of Incorrect Options (Obstructive Causes):** * **Bilharzia (Schistosomiasis):** Chronic infection by *Schistosoma haematobium* leads to inflammation and fibrosis of the ureteric walls (ureteritis cystica) and bladder, causing strictures and obstructive uropathy. * **Retroperitoneal Fibrosis (Ormond’s Disease):** This condition involves the proliferation of fibrous tissue in the retroperitoneum, which characteristically encases and compresses the ureters medially, leading to bilateral obstruction. * **Renal Calculi:** Stones lodged in the ureter or renal pelvis are the most common cause of acute post-renal obstruction. Bilateral calculi or a stone in a solitary kidney can precipitate acute renal failure. **Clinical Pearls for NEET-PG:** * **Post-renal ARF** typically requires bilateral obstruction (or unilateral obstruction in a patient with a single functioning kidney) to cause a significant rise in serum creatinine. * **Retroperitoneal Fibrosis** is often idiopathic but can be associated with drugs like **Methysergide** or Ergotamine. * On imaging, retroperitoneal fibrosis classically causes **medial deviation** of the ureters.

Q: A 67-year-old chronic heavy smoker presents with a 2-week history of frank hematuria. Ultrasound of the pelvis shows a filling defect. What is the most probable diagnosis?

Transitional cell carcinoma of the bladder. **Explanation:** The clinical presentation of **painless frank hematuria** in an elderly male with a significant **smoking history** is the classic triad for **Transitional Cell Carcinoma (TCC)**, also known as Urothelial Carcinoma. 1. **Why TCC is correct:** TCC is the most common primary malignancy of the urinary bladder (accounting for >90% of cases). Smoking is the most significant risk factor, increasing the risk 3–4 fold due to alpha and beta-naphthylamines. On imaging (Ultrasound or CT), a bladder tumor typically appears as a **fixed filling defect** or an intraluminal mass. 2. **Why other options are incorrect:** * **Bladder Diverticula:** These are outpouchings of the bladder wall. While they can cause urinary stasis or stones, they do not typically present with frank hematuria unless complicated by a tumor within the diverticulum. * **Adenocarcinoma:** This is rare (<2% of bladder cancers). It is usually associated with urachal remnants (at the dome of the bladder) or cystitis glandularis. * **Squamous Cell Carcinoma (SCC):** This accounts for ~5% of cases. It is strongly associated with **chronic irritation**, such as Schistosomiasis (common in Egypt), long-term indwelling catheters, or chronic bladder stones, rather than smoking alone. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Cystoscopy with biopsy is the definitive diagnostic tool. * **Most common site:** Lateral walls of the bladder. * **Field Change Effect:** The entire urothelium (from renal pelvis to urethra) is at risk; therefore, patients with bladder TCC need evaluation of the upper tracts. * **Occupational Risks:** Exposure to arylamines in rubber, dye, and leather industries.

Question 1

Which of the following is the most appropriate cause of urinary stone formation?

Accepted Answer

High urinary oxalate

Answer

Low urinary Mg

Answer

Low urinary sodium

Answer

High urinary chloride

Question 2

Undescended testis increases the risk of which cancer?

Accepted Answer

Seminoma

Answer

Teratoma

Answer

Yolk sac tumor

Answer

Lymphoma

Question 3

What is the most common congenital urethral abnormality?

Accepted Answer

Hypospadias

Answer

Meatal stenosis

Answer

Epispadias

Answer

Diverticula

Question 4

A 25-year-old male presents with a red, swollen testis. Upon examination, the testis is felt separate from the epididymis due to marked swelling in the epididymis. What is the diagnosis?

Accepted Answer

Epididymo-orchitis

Answer

Testicular torsion

Answer

Fournier's gangrene

Answer

Testicular cancer

Question 5

What is the commonest cause of ureteric injury during surgical operations?

Accepted Answer

Hysterectomy

Answer

Abdomino-perineal resection

Answer

Prostatectomy

Answer

Colectomy

Question 6

What is a known complication of ectopic testis?

Accepted Answer

Torsion

Answer

Seminoma

Answer

Atrophy

Answer

All of the above

Question 7

Which is the site for urine extravasation in an extraperitoneal bladder rupture?

Accepted Answer

Prevesical region

Answer

Groin

Answer

Paracolic gutter

Answer

None of the above

Question 8

A 65-year-old male is diagnosed with prostatic cancer based on transrectal biopsy of a 1 cm palpable nodule. Which of the following statements are true concerning his management?

Accepted Answer

If the tumour is confined within the prostatic capsule, radical prostatectomy is an appropriate option.

Answer

If positive lymph nodes are detected on laparoscopic pelvic lymph node dissection, radical prostatectomy is indicated.

Answer

Radical prostatectomy is invariably associated with impotence.

Answer

There is currently no role for orchidectomy in the management of prostatic cancer.

Question 9

Which of the following is NOT an obstructive cause of acute renal failure?

Accepted Answer

Duplex ureter

Answer

Bilharzia

Answer

Retroperitoneal fibrosis

Answer

Renal calculi

Question 10

A 67-year-old chronic heavy smoker presents with a 2-week history of frank hematuria. Ultrasound of the pelvis shows a filling defect. What is the most probable diagnosis?

Accepted Answer

Transitional cell carcinoma of the bladder

Answer

Bladder diverticula

Answer

Adenocarcinoma of the bladder

Answer

Squamous cell carcinoma of the bladder

Urology — MCQs

Urology — MCQs

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