Urology Practice Questions

Q: Predisposing factors for carcinoma of the penis include all of the following except:

Papilloma. **Explanation:** Carcinoma of the penis (most commonly Squamous Cell Carcinoma) is strongly associated with chronic irritation, poor hygiene, and specific viral infections. **Why Papilloma is the correct answer:** While Human Papillomavirus (HPV) types 16 and 18 are significant risk factors, a simple **Papilloma** (a benign epithelial tumor) is not considered a direct predisposing or premalignant condition for penile cancer. In contrast, conditions like *Erythroplasia of Queyrat* or *Bowen’s disease* (Carcinoma in situ) are the actual precursors. **Analysis of Incorrect Options:** * **Phimosis (Option B):** This is the most significant risk factor. It leads to the accumulation of **smegma**, which acts as a chronic chemical irritant and promotes bacterial decomposition, significantly increasing carcinogenic risk. * **Balanoposthitis (Option C):** Chronic inflammation of the glans and foreskin (often due to poor hygiene or phimosis) causes recurrent tissue injury and repair, which predisposes the epithelium to malignant transformation. * **Paget’s Disease (Option D):** Extramammary Paget’s disease of the penis is a rare intraepithelial neoplasia. It is considered a premalignant condition that can progress to or be associated with underlying adnexal carcinoma. **NEET-PG High-Yield Pearls:** * **Protective Factor:** Neonatal circumcision is highly protective against penile cancer (virtually eliminates the risk). * **Premalignant Lesions:** Remember the "Rule of B" – **B**owen’s disease (shaft), **B**alanitis Xerotica Obliterans (BXO), and **B**uschke-Löwenstein tumor (Giant Condyloma Acuminatum). * **Lymph Node Spread:** The first site of metastasis is usually the **Vertical group of Superficial Inguinal Lymph Nodes**. * **Sentinel Node:** The **Node of Cloquet** (deep inguinal) is a key landmark in surgical staging.

Q: What is the major hazard of an ectopic testis?

Liable to injury. ### Explanation The primary hazard of an **ectopic testis** is its increased susceptibility to **trauma (injury)**. Unlike an undescended testis (cryptorchidism), which is arrested along the normal path of descent (usually in the inguinal canal), an ectopic testis deviates from this path. It is most commonly found in the **superficial inguinal pouch** (Denis Browne pouch), but can also be perineal, femoral, or at the base of the penis. In these superficial and fixed locations, the testis lacks the protective mobility of the scrotum and is not shielded by the inguinal canal, making it highly **liable to injury** from external pressure or direct trauma. #### Analysis of Incorrect Options: * **A. Impotence:** Impotence (erectile dysfunction) is a vascular or neurological issue and is not caused by the malposition of a testis. * **B. Carcinoma:** While the risk of malignancy is significantly higher in an **undescended testis** (especially intra-abdominal), the risk in an ectopic testis is much lower because it resides in a cooler environment outside the abdominal cavity. * **D. Hernia:** An indirect inguinal hernia is almost always associated with an *undescended* testis due to a patent processus vaginalis. In ectopic testis, the processus vaginalis often closes normally, making hernia a less common association. #### High-Yield Clinical Pearls for NEET-PG: * **Most common site of ectopia:** Superficial inguinal pouch. * **Most common site of undescended testis:** Inguinal canal. * **Key Distinction:** An ectopic testis has a **long spermatic cord**, allowing it to be placed in the scrotum without tension (Orchidopexy), whereas an undescended testis has a **short cord**. * **Complications of Maldescended Testis:** Infertility (due to higher temperature), Malignancy (Seminoma is most common), Torsion, and Inguinal Hernia.

Q: Optical urethroplasty is indicated for which of the following conditions?

Congenital stricture of the urethra. **Explanation:** **Optical Urethroplasty** (also known as **Direct Vision Internal Urethrotomy - DVIU**) is a minimally invasive endoscopic procedure used to treat urethral strictures. It involves using an endoscope (urethrotome) equipped with a cold knife or laser to incise the fibrotic scar tissue of the stricture under direct visualization, thereby widening the urethral lumen. 1. **Why Option A is Correct:** **Congenital stricture of the urethra** (and short-segment acquired strictures, usually <1.5 cm) is the primary indication for optical urethroplasty. It is most effective for primary, non-obliterative strictures where the underlying corpus spongiosum is relatively healthy. 2. **Why the Other Options are Incorrect:** * **B & C (Hypospadias and Epispadias):** These are congenital malformations involving an abnormal location of the urethral meatus. They require complex **reconstructive plastic surgery** (e.g., Snodgrass procedure, MAGPI) to create a new urethra (urethroplasty) and correct penile curvature (chordee), rather than a simple internal incision. * **D (Testicular Tumors):** These are managed via **Radical Inguinal Orchidectomy**. Urethral procedures have no role in the management of testicular malignancies. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Urethral Stricture:** While DVIU is common for short strictures, **Urethroplasty (Excision and Primary Anastomosis or Substitution)** is the gold standard for long-term cure, especially for recurrent or long-segment (>2 cm) strictures. * **Sachse’s Urethrotome:** The specific instrument used for Optical Urethroplasty. * **Contraindication:** DVIU should not be performed if there is an active urinary tract infection (UTI). * **Recurrence:** The most common complication of DVIU is the recurrence of the stricture.

Q: Struvite stones are primarily associated with which of the following ions?

Magnesium. **Explanation:** Struvite stones, also known as **Triple Phosphate stones**, are composed of **Magnesium Ammonium Phosphate ($MgNH_4PO_4 \cdot 6H_2O$)**. They are primarily associated with **Magnesium**, Ammonium, and Phosphate ions. These stones form in the presence of urease-producing bacteria (most commonly *Proteus mirabilis*, but also *Klebsiella* and *Pseudomonas*). The bacterial enzyme urease splits urea into ammonia and carbon dioxide, which increases the urinary pH (alkaline urine), creating the ideal environment for magnesium ammonium phosphate to precipitate. **Analysis of Options:** * **Option A (Magnesium):** This is the primary cation that defines the chemical structure of a struvite stone. * **Option B (Calcium):** While calcium is the most common component of kidney stones overall (Calcium Oxalate), it is not the defining ion of struvite. However, struvite stones often contain a small amount of Calcium Phosphate (Carbonate Apatite), which leads to the term "Triple Phosphate." * **Option C (Sodium and Potassium):** These are monovalent cations that do not form the crystalline lattice of struvite stones. * **Option D (Both Magnesium and Calcium):** While both can be present, the question asks what they are *primarily* associated with. The hallmark of struvite is the Magnesium-Ammonium-Phosphate complex. **High-Yield Clinical Pearls for NEET-PG:** * **Morphology:** They typically form **Staghorn Calculi**, filling the renal pelvis and calyces. * **Microscopy:** Characteristic **"Coffin-lid"** appearance of crystals. * **Risk Factors:** More common in females due to a higher incidence of Urinary Tract Infections (UTIs). * **Radiology:** They are **Radio-opaque** (though less dense than calcium oxalate). * **Treatment:** Complete surgical removal (often via PCNL) is necessary because the stone acts as a reservoir for bacteria, leading to recurrent infections.

Q: What is the current treatment for short-segment passable stricture of the penile and bulbous urethra?

Optical internal urethrotomy. **Explanation:** The management of urethral strictures depends on the location, length, and severity of the narrowing. For a **short-segment (<1.5–2 cm)**, passable stricture in the bulbar or penile urethra, **Optical Internal Urethrotomy (OIU)**, also known as **Direct Vision Internal Urethrotomy (DVIU)**, is the current treatment of choice. * **Why Option B is Correct:** OIU involves using an endoscope (urethrotome) to visualize the stricture directly and incising the fibrotic tissue (usually at the 12 o'clock position) using a cold knife or laser. It is minimally invasive, has a high immediate success rate for short primary strictures, and allows for rapid recovery. * **Why Options A, C, and D are Incorrect:** * **Option A:** Thompson-Walker’s urethrotome is used for **blind internal urethrotomy**. This technique is largely obsolete because it lacks endoscopic visualization, increasing the risk of false passages and rectal injury. * **Option C:** **Syme’s operation** (External Urethrotomy) is an older open surgical procedure where the stricture is opened via a perineal incision using a staff as a guide. It is rarely performed today. * **Option D:** **Wheelhouse operation** is an open procedure used for **impassable/obliterative** strictures where no guide wire can pass. It involves a perineal approach to find the proximal opening of the urethra. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Long Strictures (>2 cm):** Urethroplasty (e.g., BMG - Buccal Mucosal Graft). * **Recurrence:** If a stricture recurs after the first OIU, the success rate of a second OIU is very low (<10%); Urethroplasty is then indicated. * **Most common site of post-traumatic stricture:** Bulbar urethra (due to straddle injury). * **Most common site of post-gonococcal stricture:** Bulbar urethra.

Q: All of the following are radiolucent kidney stones except?

Cysteine. In urology, kidney stones are classified based on their appearance on a plain X-ray (KUB) as **Radiopaque** (visible), **Radiolucent** (invisible), or **Faintly Radiopaque**. ### **Why Cysteine is the Correct Answer** While most organic stones are radiolucent, **Cystine stones** are unique because they contain **Sulfur** atoms. Sulfur has a higher atomic number, which makes these stones **faintly radiopaque** (often described as having a "ground-glass" appearance). Therefore, they are not truly radiolucent like the other options. ### **Analysis of Incorrect Options (Truly Radiolucent Stones)** * **A. Uric Acid:** These are the most common radiolucent stones. They form in acidic urine and are completely invisible on X-ray but visible on CT scans (Non-Contrast CT is the gold standard). * **B. Orotic Acid:** These are rare stones associated with hereditary orotic aciduria. Like most pure organic acid stones, they do not attenuate X-rays and are radiolucent. * **C. Xanthine:** These occur due to xanthine oxidase deficiency (genetic or secondary to Allopurinol). They are also purely organic and radiolucent. ### **High-Yield Clinical Pearls for NEET-PG** * **Mnemonic for Radiolucent Stones:** **"U X O"** (Uric acid, Xanthine, Orotic acid/Indinavir). * **Cystine Stones:** Associated with a hexagonal crystal shape in urine ("Benzene ring") and a positive **Cyanide-Nitroprusside test**. * **Indinavir Stones:** These are the *only* stones that are radiolucent even on a CT scan. * **Most Radiopaque Stone:** Calcium Oxalate (Monohydrate > Dihydrate). * **Staghorn Calculi:** Usually composed of **Struvite** (Magnesium Ammonium Phosphate) and are radiopaque.

Q: Which of the following is NOT a medical indication for circumcision?

Non-retractile foreskin. **Explanation:** The correct answer is **A. Non-retractile foreskin**. In pediatric surgery, it is crucial to distinguish between **physiologic phimosis** and **pathologic phimosis**. At birth, the inner surface of the prepuce is naturally adherent to the glans, making the foreskin non-retractile. This is a normal developmental stage. By age 3, about 90% of boys will have a retractile foreskin, and this percentage increases with age. Therefore, a simple non-retractile foreskin in an asymptomatic child is not a medical indication for surgery; it requires only observation and hygiene. **Analysis of Incorrect Options:** * **Paraphimosis (B):** This is a surgical emergency where the foreskin is trapped behind the glans, causing venous congestion and edema. While initial management involves manual reduction, circumcision is indicated to prevent recurrence. * **Recurrent Balanoposthitis (C):** Chronic or recurrent inflammation of the glans (balanitis) and prepuce (posthitis), often seen in diabetic patients or those with poor hygiene, is a definitive indication for circumcision. * **Recurrent Urinary Tract Infections (D):** In children with underlying urological abnormalities (like posterior urethral valves or high-grade VUR), circumcision is indicated as it significantly reduces the bacterial colonization of the preputial space, lowering the risk of ascending UTIs. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Indication:** Pathologic phimosis (scarring of the preputial orifice, often due to *Balanitis Xerotica Obliterans* or BXO). * **BXO:** The most common cause of pathological phimosis; it appears as a white, scarred, thickened prepuce. * **Contraindication:** Never perform circumcision in patients with **Hypospadias**, as the prepuce is required for future reconstructive surgery (chordee correction or urethroplasty).

Q: An elderly male presents with a pathological fracture. Investigations reveal normal serum calcium and phosphorus, but low urine calcium. Serum alkaline phosphatase and acid phosphatase are elevated. Bone biopsy shows osteoblastic metastases. What is the most likely primary tumor site in this patient?

Prostate carcinoma. **Explanation:** The clinical presentation of an elderly male with a pathological fracture and **osteoblastic (sclerotic) metastases** is a classic hallmark of **Prostate Carcinoma**. 1. **Why Prostate Carcinoma is correct:** * **Osteoblastic Lesions:** Unlike most cancers that cause osteolytic (bone-destroying) lesions, prostate cancer typically stimulates osteoblasts, leading to dense, sclerotic bone. * **Biochemical Markers:** Elevated **Acid Phosphatase** (specifically the prostatic acid phosphatase isoenzyme) is a traditional marker for extra-capsular spread of prostate cancer. Elevated **Alkaline Phosphatase (ALP)** reflects increased osteoblastic activity during bone remodeling. * **Calcium Profile:** In osteoblastic metastases, serum calcium is often normal or low (due to calcium being "trapped" in the new bone formation), leading to low urinary calcium. 2. **Why other options are incorrect:** * **Renal Cell Carcinoma (RCC):** Typically presents with purely **osteolytic** (punched-out) lesions that are highly vascular (pulsatile). * **Breast Carcinoma:** While it can be mixed, it is predominantly **osteolytic** in most cases (though it is the most common cause of osteoblastic lesions in *females*). * **Thyroid Carcinoma:** Usually presents with **osteolytic** metastases, often described as "cold" on bone scans but "hot" on iodine scans. **Clinical Pearls for NEET-PG:** * **Most common site of bone metastasis in Prostate CA:** Lumbar spine (via the **Batson venous plexus**, which lacks valves). * **Osteoblastic vs. Osteolytic:** Prostate cancer is the most common cause of osteoblastic lesions in men; Breast cancer is the most common cause of mixed/osteoblastic lesions in women. * **PSA:** While Acid Phosphatase is mentioned here, **Prostate Specific Antigen (PSA)** is the modern gold-standard tumor marker for screening and monitoring.

Q: Randall's plaques are associated with which of the following?

Urinary stones. **Explanation:** **Randall’s plaques** are subepithelial calcifications found at the tips of the renal papillae. They are composed of **calcium phosphate (apatite)** and serve as the essential "nidus" or anchoring point for the formation of **calcium oxalate urinary stones**. 1. **Why Option B is correct:** According to the Randall’s plaque theory, the process begins in the basement membrane of the Thin Loop of Henle. These deposits migrate through the interstitium to the papillary tip, eventually eroding through the urothelium. Once exposed to supersaturated urine, they act as a surface for calcium oxalate crystallization, leading to nephrolithiasis. 2. **Why other options are incorrect:** * **A. Bile stones:** Gallstones (cholelithiasis) form due to imbalances in cholesterol, bilirubin, and bile salts within the gallbladder, unrelated to papillary calcification. * **C. Premalignant lesions:** Randall’s plaques are benign mineral deposits and have no association with malignancy or cellular dysplasia. * **D. Bacterial infections:** While some stones (Struvite) are associated with infection (Proteus), Randall’s plaques are a metabolic/physiologic phenomenon primarily linked to idiopathic calcium stone formers. **High-Yield Facts for NEET-PG:** * **Composition:** Primarily Calcium Phosphate (Hydroxyapatite). * **Location:** Renal papillary interstitium (subepithelial). * **Carr’s Pouches:** Another theory suggesting stones form in obstructed lymphatics of the kidney (often confused with Randall’s plaques). * **Imaging:** On non-contrast CT (NCCT), these appear as tiny hyperdense spots at the papillary tips before a formal stone is visible.

Question 1

Predisposing factors for carcinoma of the penis include all of the following except:

Accepted Answer

Papilloma

Answer

Paget's disease

Answer

Phimosis

Answer

Balanoposthitis

Question 2

What is the major hazard of an ectopic testis?

Accepted Answer

Liable to injury

Answer

Impotence

Answer

Carcinoma

Answer

Hernia

Question 3

Optical urethroplasty is indicated for which of the following conditions?

Accepted Answer

Congenital stricture of the urethra

Answer

Hypospadias

Answer

Epispadias

Answer

Testicular tumors

Question 4

Struvite stones are primarily associated with which of the following ions?

Accepted Answer

Magnesium

Answer

Calcium

Answer

Sodium and Potassium

Answer

Both Magnesium and Calcium

Question 5

What is the current treatment for short-segment passable stricture of the penile and bulbous urethra?

Accepted Answer

Optical internal urethrotomy

Answer

Internal urethrotomy with Thompson-Walker's urethrotome

Answer

Syme's operation

Answer

Wheelhouse operation

Question 6

All of the following are radiolucent kidney stones except?

Accepted Answer

Cysteine

Answer

Uric acid

Answer

Orotic acid

Answer

Xanthiene

Question 7

Which of the following is NOT a medical indication for circumcision?

Accepted Answer

Non-retractile foreskin

Answer

Paraphimosis

Answer

Recurrent balanoposthitis

Answer

Recurrent urinary tract infections

Question 8

An elderly male presents with a pathological fracture. Investigations reveal normal serum calcium and phosphorus, but low urine calcium. Serum alkaline phosphatase and acid phosphatase are elevated. Bone biopsy shows osteoblastic metastases. What is the most likely primary tumor site in this patient?

Accepted Answer

Prostate carcinoma

Answer

Renal cell carcinoma

Answer

Breast carcinoma

Answer

Thyroid carcinoma

Question 9

Which of the following statements about detrusor instability is false?

Accepted Answer

Genuine stress incontinence (GSI) is indistinguishable from detrusor instability.

Answer

50% of men with bladder outflow obstruction have detrusor instability.

Answer

Patients with neurogenic bladder may have detrusor instability.

Answer

Urodynamic studies are essential for evaluation of detrusor instability.

Question 10

Randall's plaques are associated with which of the following?

Accepted Answer

Urinary stones

Answer

Bile stones

Answer

Premalignant lesions

Answer

Bacterial infections

Urology — MCQs

Urology — MCQs

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