Urology Practice Questions

Q: Most surgeons prefer incomplete fistulous tract excision (Latzko repair) to avoid which of the following complications?

Preserving scar tissue surrounding the fistula.. ### Explanation The **Latzko procedure** is a vaginal approach used for the repair of vesicovaginal fistulas (VVF), particularly those occurring after a total hysterectomy. **Why Option C is Correct:** The core principle of the Latzko repair is **partial colpocleisis**. Unlike traditional fistula repairs that involve radical excision of the fistulous tract, the Latzko technique involves denuding only the vaginal mucosa around the fistula (about 1–2 cm). The **scar tissue surrounding the fistula is intentionally preserved** rather than excised. This scar tissue provides a tough, fibrous foundation that adds structural integrity to the repair and supports the multiple layers of closure. Excising the tract entirely would create a larger defect in a poorly vascularized area, increasing the risk of failure. **Analysis of Incorrect Options:** * **A & B:** While enlarging the defect and weakening tissue are consequences of radical excision, the specific surgical *intent* of the Latzko technique is the utilization of the existing fibrotic ring (scar) as a biological "washer" to reinforce the suture line. * **D:** Compromising the repair is a general outcome of poor technique, but the question asks for the specific anatomical/pathological reason for choosing incomplete excision. **High-Yield Clinical Pearls for NEET-PG:** * **Indications:** Best for post-hysterectomy VVFs located at the vaginal vault. * **Technique:** It involves a layered closure (vesical muscularis, perivesical fascia, and vaginal mucosa) without entering the peritoneal cavity. * **Success Rate:** Very high (>90-95%) due to the preservation of the blood supply and the use of the sturdy scar tissue. * **Limitation:** It results in slight shortening of the vagina, though usually not enough to cause significant dyspareunia.

Q: Which one of the following is not used as a tumor marker in testicular tumors?

CEA. **Explanation:** In the management of testicular germ cell tumors (GCTs), tumor markers are essential for diagnosis, staging, prognosis, and monitoring treatment response. **Why CEA is the correct answer:** **Carcinoembryonic Antigen (CEA)** is a non-specific oncofetal antigen primarily used in the management of colorectal, gastrointestinal, and medullary thyroid carcinomas. It has no clinical utility or diagnostic value in testicular germ cell tumors. **Why the other options are incorrect:** * **AFP (Alpha-Fetoprotein):** Produced by the yolk sac element. It is elevated in **Yolk Sac Tumors** and many Non-Seminomatous Germ Cell Tumors (NSGCTs). Crucially, AFP is **never** elevated in pure seminomas. * **HCG (Human Chorionic Gonadotropin):** Produced by syncytiotrophoblasts. It is always elevated in **Choriocarcinoma** and elevated in about 10-15% of pure seminomas. * **LDH (Lactate Dehydrogenase):** A marker of tumor burden, growth rate, and cellular turnover. While less specific than AFP or HCG, it is an independent prognostic indicator in the International Germ Cell Cancer Collaborative Group (IGCCCG) classification. **High-Yield Clinical Pearls for NEET-PG:** * **Pure Seminoma:** May have elevated HCG, but **AFP is always normal**. If AFP is elevated, the tumor must be treated as an NSGCT. * **Most sensitive marker for monitoring:** HCG (due to its short half-life of 24-36 hours). * **Teratoma:** Usually does not produce AFP or HCG (unless mixed). * **Yolk Sac Tumor:** Most common testicular tumor in infants; AFP is the hallmark marker.

Q: Cryptorchidism is associated with malignant changes to which of the following?

Seminoma. **Explanation:** **Cryptorchidism** (undescended testis) is the most 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:** While cryptorchidism increases the risk of all types of germ cell tumors, **Seminoma** is statistically the most common histological subtype associated with an undescended testis. The underlying pathophysiology involves thermal stress (due to higher intra-abdominal temperatures) and dysgenesis of the germ cells, which leads to malignant transformation. Interestingly, even after surgical correction (orchiopexy), the risk of malignancy remains higher than in the general population, though it is significantly reduced if performed before puberty. **Why other options are incorrect:** * **A. Squamous cell carcinoma:** This is typically associated with chronic irritation or HPV infection (e.g., penile cancer) and is not a primary tumor of the testicular parenchyma. * **C & D. Embryonal cell carcinoma and Choriocarcinoma:** These are types of Non-Seminomatous Germ Cell Tumors (NSGCTs). While they can occur in a patient with a history of cryptorchidism, they are less frequent than Seminomas in this specific clinical context. **High-Yield Clinical Pearls for NEET-PG:** * **Contralateral Risk:** 10% of patients with unilateral cryptorchidism develop a tumor in the *normally descended* contralateral testis. * **Location:** The higher the testis is located (e.g., abdominal vs. inguinal), the higher the risk of malignancy. * **Best Time for Surgery:** Current guidelines recommend orchiopexy between **6 to 12 months** of age to preserve fertility and facilitate easier screening for malignancy. * **Most Common Site:** The most common site for an undescended testis is the **inguinal canal**.

Q: Which of the following kidney stones is radiolucent?

Uric acid. **Explanation:** The radiopacity of a kidney stone depends on its atomic weight and density. Most kidney stones contain calcium, which has a high atomic number, making them radiopaque (visible on X-ray). **Correct Answer: B. Uric acid** Uric acid stones are composed of light elements (Carbon, Nitrogen, Oxygen, and Hydrogen). Because they lack heavy minerals like calcium, they do not attenuate X-rays and appear **radiolucent** on plain films. However, they are visible on Non-Contrast Computed Tomography (NCCT) and Ultrasound. **Analysis of Incorrect Options:** * **A. Cysteine:** These stones contain sulfur atoms. While less dense than calcium stones, they are **faintly radiopaque** (often described as having a "ground-glass" appearance). * **C. Oxalate:** Calcium oxalate (monohydrate and dihydrate) is the most common type of stone. Due to the high calcium content, these are **highly radiopaque**. * **D. Struvite:** Also known as "triple phosphate" or "infection stones" (Magnesium Ammonium Phosphate), these contain magnesium and phosphate. They are **radiopaque** and often form large staghorn calculi. **High-Yield Clinical Pearls for NEET-PG:** 1. **Mnemonic for Radiopacity:** "I **C**an **C**learly **S**ee **U**" (In order of decreasing opacity: **C**alcium oxalate > **C**alcium phosphate > **S**truvite > **C**ysteine > **U**ric acid). 2. **Pure Uric Acid stones** are the only truly radiolucent stones. 3. **Management:** Uric acid stones can often be dissolved via **medical alkalization of urine** (pH > 6.5) using potassium citrate. 4. **Gold Standard Investigation:** NCCT KUB is the investigation of choice for all stones, as it detects even radiolucent uric acid stones.

Q: All of the following types of renal stones are seen in females, EXCEPT:

Renal stones in Lesch-Nyhan syndrome. **Explanation:** The correct answer is **D. Renal stones in Lesch-Nyhan syndrome**. **Why it is the correct answer:** Lesch-Nyhan syndrome is an **X-linked recessive** disorder caused by a deficiency of the enzyme hypoxanthine-guanine phosphoribosyltransferase (HGPRT). Because it is X-linked recessive, the clinical phenotype—characterized by hyperuricemia, gout, self-mutilation, and **uric acid renal stones**—is seen almost exclusively in **males**. Females are typically asymptomatic carriers. **Why the other options are incorrect:** * **A. Idiopathic hypercalciuria:** This is the most common metabolic abnormality in stone formers. It follows an autosomal dominant inheritance pattern or is multifactorial, affecting both males and females. * **B. Distal Renal Tubular Acidosis (Type 1 RTA):** This condition leads to alkaline urine, hypocitraturia, and hypercalciuria, resulting in nephrocalcinosis and calcium phosphate stones. It affects both sexes equally. * **C. Primary hyperoxaluria:** This is an autosomal recessive genetic disorder leading to excessive oxalate production and calcium oxalate stones. As an autosomal condition, it occurs in both males and females. **NEET-PG High-Yield Pearls:** * **Lesch-Nyhan Syndrome:** Look for the triad of "Gout, Intellectual disability, and Self-mutilation" in a male child. * **Staghorn Calculi:** More common in females due to the higher incidence of Proteus-induced Urinary Tract Infections (UTIs) and struvite stones. * **Most common stone overall:** Calcium oxalate (specifically Calcium oxalate monohydrate/Whewellite). * **Stone Radiopacity:** Most stones are radiopaque; **Pure Uric Acid** and **Indinavir** stones are classically radiolucent on X-ray.

Q: Seminoma of the testis is most commonly seen in which of the following demographic groups?

Younger age groups. **Explanation:** **Seminoma** is the most common type of germ cell tumor (GCT) of the testis. The correct answer is **Younger age groups** because testicular cancer, particularly seminomas, characteristically peaks in the **3rd to 4th decades of life (ages 30–40)**. While non-seminomatous germ cell tumors (NSGCTs) peak slightly earlier (ages 20–30), seminomas remain a disease of young to middle-aged adults. **Analysis of Options:** * **A. Patients with undescended testes:** While cryptorchidism is the most significant **risk factor** for developing a seminoma, it is not the demographic group where the tumor is "most commonly seen." Most patients who present with seminoma have normally descended testes. * **B. Cases with bilateral testicular involvement:** Bilateral involvement is rare, occurring in only about 1–2% of cases. When it does occur, seminoma is the most common histological subtype, but it is not the standard clinical presentation. * **D. Elderly individuals:** Testicular tumors are rare in the elderly. The most common testicular tumor in men over 60 is actually **Testicular Lymphoma**, not seminoma. (Note: Spermatocytic tumor, formerly spermatocytic seminoma, occurs in older men but is a distinct, rare entity). **High-Yield Clinical Pearls for NEET-PG:** * **Tumor Marker:** Seminomas are typically associated with elevated **hCG** (in 10-15% of cases) but **never** cause an elevation in **Alpha-Fetoprotein (AFP)**. If AFP is elevated, it is by definition a Non-Seminomatous GCT. * **Radiosensitivity:** Seminomas are highly radiosensitive and have an excellent prognosis. * **Microscopy:** Classic "fried-egg" appearance (clear cytoplasm, central nucleus) with fibrous septa infiltrated by lymphocytes.

Q: Watercan perineum is caused by which organism?

Neisseria gonorrhoeae. **Explanation:** **Watercan perineum** is a classic clinical manifestation of chronic **urethral stricture**, most commonly resulting from untreated or recurrent **gonococcal urethritis**. 1. **Why Neisseria gonorrhoeae is correct:** Infection with *N. gonorrhoeae* leads to severe inflammation of the urethral mucosa and periurethral glands (Glands of Littre). If inadequately treated, this progresses to periurethral abscesses. These abscesses eventually rupture through the skin of the perineum or scrotum, forming multiple fistulous tracts. When the patient voids, urine leaks through these multiple openings, resembling the spray of a **watering can**. 2. **Why other options are incorrect:** * **E. coli & Enterococcus fecalis:** While these are common causes of urinary tract infections (UTIs) and acute prostatitis, they do not typically cause the specific chronic inflammatory fibrosis and fistulization required to produce a watercan perineum. * **Treponema pallidum:** This is the causative agent of Syphilis. Its primary manifestations are chancres (primary), rashes (secondary), or gummas (tertiary), but it does not cause urethral strictures or perineal fistulae. **Clinical Pearls for NEET-PG:** * **Most common site:** The bulbar urethra is the most common site for post-inflammatory (gonococcal) strictures. * **Modern Etiology:** While *N. gonorrhoeae* is the classic textbook cause, in modern clinical practice, **iatrogenic trauma** (catheterization, cystoscopy) is the most common cause of urethral strictures overall. * **Management:** Initial management involves urinary diversion (suprapubic cystostomy) followed by definitive surgery, such as urethroplasty. * **Fournier’s Gangrene:** Do not confuse watercan perineum with Fournier’s gangrene, which is a rapidly progressing polymicrobial necrotizing fasciitis of the perineum.

Question 1

Most surgeons prefer incomplete fistulous tract excision (Latzko repair) to avoid which of the following complications?

Accepted Answer

Preserving scar tissue surrounding the fistula.

Answer

Enlarging of the defect.

Answer

Weakening of surrounding tissue.

Answer

Compromising the repair.

Question 2

A 35-year-old engineer presented with bleeding from the external meatus and a perineal hematoma after falling astride on scaffolding half an hour ago. The patient has not passed urine since the accident. On physical examination, there was no evidence of extravasation of urine, and the bladder was not distended. What is the immediate management?

Accepted Answer

Assess the urethral injury by ascending urethrography.

Answer

Encourage the patient to pass urine after adequate pain control.

Answer

Percutaneous suprapubic catheterization of the bladder.

Answer

Catheterization of the urethra.

Question 3

Which one of the following is not used as a tumor marker in testicular tumors?

Accepted Answer

CEA

Answer

AFP

Answer

LDH

Answer

HCG

Question 4

Which of the following is NOT typically seen in von Hippel-Lindau syndrome?

Accepted Answer

Gastric carcinoma

Answer

Renal cysts

Answer

Hemangioblastoma

Answer

Renal clear cell carcinoma

Question 5

Cryptorchidism is associated with malignant changes to which of the following?

Accepted Answer

Seminoma

Answer

Squamous cell carcinoma

Answer

Embryonal cell carcinoma

Answer

Choriocarcinoma

Question 6

Which of the following kidney stones is radiolucent?

Accepted Answer

Uric acid

Answer

Cysteine

Answer

Oxalate

Answer

Struvite

Question 7

All of the following types of renal stones are seen in females, EXCEPT:

Accepted Answer

Renal stones in Lesch-Nyhan syndrome

Answer

Stones associated with Idiopathic hypercalciuria

Answer

Renal stones in Distal renal tubular acidosis

Answer

Renal stones in Primary hyperoxaluria

Question 8

Seminoma of the testis is most commonly seen in which of the following demographic groups?

Accepted Answer

Younger age groups

Answer

Patients with undescended testes

Answer

Cases with bilateral testicular involvement

Answer

Elderly individuals

Question 9

What is the treatment of choice for a 4-month-old female child presenting with grade IV Vesico-Ureteral Reflux (VUR) without dilation of the urinary bladder?

Accepted Answer

Trimethoprim-sulfamethoxazole plus follow-up

Answer

Re-implantation of the ureter

Answer

Injection of collagen at the ureteric orifices

Answer

Bilateral ureterostomy

Question 10

Watercan perineum is caused by which organism?

Accepted Answer

Neisseria gonorrhoeae

Answer

E. coli

Answer

Enterococcus fecalis

Answer

Treponema pallidum

Urology — MCQs

Urology — MCQs

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