Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 451: Which of the following syndromes is associated with supernumerary teeth?

A. Gardner's syndrome.
B. Cleidocranial dysplasia.
C. Cleft lip and palate.
D. All of the above. (Correct Answer)

Explanation: **Explanation:** Supernumerary teeth (hyperdontia) refer to the presence of teeth in excess of the normal dental formula. While often idiopathic, they are frequently associated with specific genetic syndromes. **1. Gardner’s Syndrome:** A variant of Familial Adenomatous Polyposis (FAP), it is characterized by the triad of intestinal polyposis, soft tissue tumors (desmoids/sebaceous cysts), and skeletal abnormalities (osteomas of the mandible/skull). Impacted supernumerary teeth are a classic diagnostic marker. **2. Cleidocranial Dysplasia:** This autosomal dominant condition affects bones formed by intramembranous ossification. Key features include aplastic/hypoplastic clavicles (allowing the patient to touch shoulders in the midline) and delayed closure of fontanelles. Multiple impacted supernumerary teeth and failure of permanent teeth to erupt are hallmark dental findings. **3. Cleft Lip and Palate:** These are common craniofacial anomalies. Supernumerary teeth often occur near the cleft site (especially the maxillary lateral incisor region) due to the fragmentation of the dental lamina during the developmental process. **Conclusion:** Since all three conditions are well-documented to present with supernumerary teeth, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Most common supernumerary tooth:** Mesiodens (located between the maxillary central incisors). * **Gardner’s Syndrome Mnemonic:** "SOD" – **S**oft tissue tumors, **O**steomas, **D**ental anomalies (and Polyps). * **Cleidocranial Dysplasia:** Look for the *RUNX2* gene mutation in clinical vignettes. * **Differential Diagnosis:** Other syndromes with supernumerary teeth include Hallermann-Streiff syndrome and Orofaciodigital syndrome type I.

Question 452: Which of the following stones is hard to break by ESWL?

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

Explanation: **Explanation:** Extracorporeal Shock Wave Lithotripsy (ESWL) effectiveness depends primarily on the stone's density and crystalline structure. The hardness of a stone is measured in Hounsfield Units (HU) on CT scan; stones with >1000 HU are generally resistant to ESWL. **1. Why Calcium Oxalate Monohydrate (COM) is correct:** COM (Whewellite) is the hardest common urinary stone. It has a dense, compact crystalline lattice and a smooth surface, making it highly resistant to fragmentation by shock waves. Patients with COM stones often require alternative procedures like Laser Lithotripsy (URS) or PCNL. **2. Why the other options are incorrect:** * **Calcium Oxalate Dihydrate (COD):** Unlike the monohydrate form, COD (Weddellite) has a jagged, spiky surface and a more porous internal structure, making it very **fragile** and easy to break with ESWL. * **Uric Acid:** These stones have low density (<500 HU) and are generally easy to fragment. However, they are radiolucent, often requiring contrast or ultrasound for targeting during ESWL. (Note: Medical dissolution is the first-line treatment for uric acid stones). * **Struvite (Triple Phosphate):** These are "soft" stones associated with infection. While they fragment easily, ESWL is often avoided for large staghorn struvite stones due to the risk of "Steinstrasse" and sepsis. **High-Yield Clinical Pearls for NEET-PG:** * **Hardest Stone:** Calcium Oxalate Monohydrate (COM). * **Softest/Most Fragile Stone:** Brushite (Calcium Phosphate) or Cystine (though Cystine is "tough" and resists fragmentation due to its rubbery consistency). * **ESWL Contraindications:** Pregnancy (absolute), uncorrected bleeding diathesis, distal obstruction, and AAA (near the stone). * **Hounsfield Unit (HU) Cut-off:** Stones >1000 HU have a high failure rate with ESWL.

Question 453: Which one of the following is used as an irrigation solution during transurethral resection of the prostate?

A. 1.5% glycine (Correct Answer)
B. Physiological saline
C. Ringer's lactate
D. 5% dextrose

Explanation: **Explanation:** The primary goal of an irrigation fluid during Transurethral Resection of the Prostate (TURP) is to provide clear visualization while remaining non-conductive and non-hemolytic. **1. Why 1.5% Glycine is the Correct Answer:** Glycine (1.5%) is a non-electrolytic, non-hemolytic, and transparent solution. Since TURP involves the use of **monopolar electrocautery**, the irrigation fluid must be **non-conductive** to prevent the electrical current from dispersing away from the loop. Glycine meets these criteria, making it the gold standard for monopolar TURP. **2. Why the Other Options are Incorrect:** * **Physiological Saline (0.9% NaCl) & Ringer's Lactate:** These are **isotonic electrolytes**. Because they conduct electricity, they would cause the electrical current to dissipate, potentially causing thermal injury to surrounding tissues and rendering the monopolar loop ineffective. (Note: Saline *is* used in Bipolar TURP). * **5% Dextrose:** While non-conductive, it is not used because it creates a "sticky" surgical field and can lead to significant hyperglycemia if absorbed systemically. **3. Clinical Pearls for NEET-PG:** * **TURP Syndrome:** This is a life-threatening complication caused by the systemic absorption of glycine. It presents with **dilutional hyponatremia**, fluid overload, and neurological symptoms (confusion, seizures). * **Glycine Toxicity:** Glycine is an inhibitory neurotransmitter. Its metabolism can lead to **hyperammonemia** and transient **visual disturbances/blindness**. * **Bipolar TURP:** The modern trend is shifting toward Bipolar TURP, which allows the use of **Normal Saline**, significantly reducing the risk of TURP syndrome. * **Other Fluids:** Distilled water (causes hemolysis) and Mannitol/Sorbitol (can cause osmotic diuresis) are less commonly used alternatives.

Question 454: Concomitant chemoradiotherapy is indicated in all of the following conditions EXCEPT:

A. Stage III B Ca cervix
B. T2 N0 M0 anal cancer
C. T2 N0 M0 glottic cancer (Correct Answer)
D. T1 N2 M0 nasopharyngeal cancer

Explanation: **Explanation:** The core concept tested here is the standard of care for various malignancies. **Concomitant Chemoradiotherapy (CCRT)** is used as a primary treatment for advanced or aggressive tumors to improve local control and survival. **Why Option C is the Correct Answer:** For **Early Glottic Cancer (T1-T2, N0, M0)**, the standard of care is **single-modality therapy**—either radiotherapy alone or organ-preserving surgery (like CO2 laser excision). CCRT is not indicated because single-modality treatment achieves excellent cure rates (85-95%) while preserving voice quality. Adding chemotherapy would increase toxicity without providing a significant survival benefit in early-stage disease. CCRT is reserved for advanced laryngeal cancers (T3-T4) as an organ-preservation strategy. **Analysis of Incorrect Options:** * **Stage III B Ca Cervix:** CCRT (Cisplatin-based) is the gold standard for locally advanced cervical cancer (Stage IB3 to IVA). * **T2 N0 M0 Anal Cancer:** The **Nigro Protocol** (CCRT with 5-FU and Mitomycin-C) is the definitive treatment for squamous cell carcinoma of the anal canal, avoiding the need for permanent colostomy. * **T1 N2 M0 Nasopharyngeal Cancer:** Because of its high radiosensitivity and chemosensitivity, CCRT is the standard treatment for all nasopharyngeal cancers except Stage I (T1N0). **Clinical Pearls for NEET-PG:** * **Nigro Protocol:** Definitive CCRT for Anal Canal Cancer. * **Cisplatin:** The most common radiosensitizer used in CCRT for Head & Neck and Cervical cancers. * **Early Glottic Cancer:** Radiotherapy and Surgery are equally effective; the choice depends on patient preference and functional outcome.

Question 455: The penis is curved in a downward direction in all types of hypospadias except?

A. Glandular (Correct Answer)
B. Coronal
C. Penile
D. Perineal

Explanation: **Explanation:** Hypospadias is a congenital anomaly characterized by the ectopic opening of the urethral meatus on the ventral aspect of the penis. It is classically associated with **chordee**, which is a ventral (downward) curvature of the penis caused by fibrous bands or a short urethra. **Why Glandular is the correct answer:** In **Glandular hypospadias**, the urethral opening is located on the glans penis, very close to its normal position. Because the defect is distal and minimal, there is usually no significant fibrous tissue development or urethral shortening proximal to the glans. Consequently, **chordee is typically absent** in the glandular variety. **Analysis of Incorrect Options:** * **Coronal:** This is a distal type of hypospadias where the opening is at the junction of the glans and the shaft. Chordee begins to appear at this level and is present in a significant number of cases. * **Penile:** In mid-shaft or proximal penile hypospadias, the degree of ventral curvature is usually marked due to the presence of well-developed fibrous bands (chordee) replacing the corpus spongiosum. * **Perineal:** This is the most severe form. The more proximal the urethral opening, the more severe the associated chordee. Perineal hypospadias is almost universally associated with significant downward curvature and often bifid scrotum. **Clinical Pearls for NEET-PG:** * **Triad of Hypospadias:** Ectopic urethral meatus, Chordee (ventral curvature), and Hooded prepuce (deficient ventral foreskin). * **Contraindication:** Circumcision is strictly contraindicated in neonates with hypospadias because the prepuce is required for future reconstructive surgery (urethroplasty). * **Best Time for Surgery:** Ideally between **6 to 12 months** of age. * **Common Procedures:** Snodgrass (TIP) repair is the most common for distal cases; Duckett’s procedure for proximal cases.

Question 456: A 67-year-old man presented with a single episode of gross painless hematuria. An excretory urogram showed a 1.5 cm round filling defect in the right lower renal infundibulum. What is the best next study to obtain?

A. Urinary cytology
B. Cystoscopy
C. Ultrasonography (Correct Answer)
D. Retrograde pyelography

Explanation: ### Explanation The primary goal in evaluating a filling defect on an excretory urogram (IVP) is to differentiate between a **radiolucent calculus**, a **blood clot**, and a **soft tissue mass** (such as Transitional Cell Carcinoma). **Why Ultrasonography is the correct answer:** In this clinical scenario, Ultrasonography (USG) is the most appropriate next step because it is a non-invasive, cost-effective tool that can reliably distinguish between a solid mass and a non-opaque stone. A stone will appear as a hyperechoic structure with posterior acoustic shadowing, whereas a tumor (TCC) will appear as a solid, hypoechoic mass without shadowing. Given the patient’s age and the "painless hematuria," ruling out a tumor is critical, but confirming the physical nature of the filling defect is the immediate diagnostic priority. **Analysis of Incorrect Options:** * **Urinary Cytology (A):** While useful for detecting high-grade TCC, it has low sensitivity for low-grade tumors and cannot characterize the physical nature of a filling defect. It is an adjunct, not the immediate next step. * **Cystoscopy (B):** This is essential to rule out bladder causes of hematuria, but it will not help characterize a filling defect located in the renal infundibulum (upper tract). * **Retrograde Pyelography (D):** This provides excellent anatomical detail of the collecting system and is used if IVP is inconclusive or if the patient has renal failure. However, it is invasive and still may not definitively distinguish a radiolucent stone from a small tumor as well as USG or CT can. **Clinical Pearls for NEET-PG:** * **Painless gross hematuria** in an elderly patient is **Transitional Cell Carcinoma (TCC)** until proven otherwise. * The most common cause of a radiolucent filling defect on IVP is a **Uric Acid stone**. * **CT Urography (Triple Phase)** is currently the gold standard for evaluating the upper urinary tract, but in the context of traditional step-wise management, USG is the immediate tool to differentiate stone from mass.

Question 457: Which of the following is NOT a risk factor for the development of critical limb ischemia?

A. Diabetes
B. Hyperlipidemia
C. Moderate alcohol intake (Correct Answer)
D. Hyperhomocysteinemia

Explanation: **Explanation:** Critical Limb Ischemia (CLI) is the most advanced stage of Peripheral Arterial Disease (PAD), characterized by chronic ischemic rest pain, ulcers, or gangrene. The pathophysiology involves systemic atherosclerosis, and its risk factors are identical to those of coronary artery disease. **Why Moderate Alcohol Intake is the Correct Answer:** Moderate alcohol consumption (typically defined as 1–2 drinks per day) has not been proven to be a risk factor for CLI. In fact, several epidemiological studies suggest a "U-shaped" relationship, where moderate intake may have a mild protective effect on the vascular endothelium and lipid profiles, unlike heavy consumption which increases cardiovascular risk. **Analysis of Incorrect Options:** * **Diabetes Mellitus:** This is the most potent risk factor for CLI. It promotes "Mönckeberg’s medial calcification" and leads to multisegmental, infrapopliteal (below-the-knee) arterial involvement, significantly increasing the risk of amputation. * **Hyperlipidemia:** Elevated LDL and low HDL levels promote the formation of atherosclerotic plaques within the arterial walls, narrowing the lumen and reducing distal perfusion. * **Hyperhomocysteinemia:** High levels of homocysteine cause endothelial damage and promote a pro-thrombotic state, acting as an independent risk factor for premature atherosclerosis and CLI. **Clinical Pearls for NEET-PG:** * **Strongest Risk Factor:** Smoking is the most significant modifiable risk factor for PAD/CLI. * **Fontaine Classification:** Stage III (Rest pain) and Stage IV (Ulceration/Gangrene) constitute CLI. * **Ankle-Brachial Index (ABI):** An ABI < 0.4 is typically associated with Critical Limb Ischemia. * **TASC II Criteria:** Used for the management of aorto-iliac and femoropopliteal lesions.

Question 458: Which of the following statements is true regarding testicular tumors?

A. Are embryonal cell carcinomas in 95% of cases
B. Bilateral in up to 10% of cases (Correct Answer)
C. Teratomas are more common than seminomas
D. Usually present after 50 years of age

Explanation: **Explanation:** Testicular tumors are the most common solid malignancy in men aged 15–35 years. Understanding their epidemiology and classification is high-yield for NEET-PG. **Why Option B is Correct:** While most testicular tumors are unilateral, **bilateral involvement occurs in approximately 1–10% of cases**. These can be synchronous (occurring at the same time) or metachronous (occurring at different times). The most common histological subtype found in bilateral cases is **Seminoma**. Additionally, Testicular Intraepithelial Neoplasia (TIN) is often found in the contralateral testis of patients with a known germ cell tumor (GCT). **Analysis of Incorrect Options:** * **Option A:** Approximately 95% of testicular tumors are **Germ Cell Tumors (GCTs)**, not specifically embryonal cell carcinomas. GCTs are further divided into Seminomas (~50%) and Non-Seminomatous Germ Cell Tumors (NSGCTs). * **Option C:** **Seminomas are the most common** single histological subtype of testicular GCTs. Teratomas are a subtype of NSGCTs and are less frequent than seminomas in adults. * **Option D:** Testicular tumors typically present in young men (**peak incidence 15–35 years**). A testicular mass in a man **over 50 years** is most likely **Lymphoma** (specifically Diffuse Large B-cell Lymphoma), which is the most common secondary testicular tumor in older age groups. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factor:** Cryptorchidism (undescended testis) is the most significant risk factor; orchiopexy reduces the risk of malignancy but does not eliminate it. * **Lymphatic Spread:** Testicular tumors primarily spread to **Para-aortic lymph nodes** (not inguinal nodes, unless the scrotum is involved). * **Tumor Markers:** * **AFP:** Never raised in pure Seminoma (if raised, suspect NSGCT). * **hCG:** Elevated in Choriocarcinoma and some Seminomas. * **LDH:** Correlates with tumor burden/bulk.

Question 459: A 10-mm calculus in the right lower ureter associated with proximal hydroureteronephrosis is best treated with?

A. Extracorporeal shockwave lithotripsy
B. Antegrade percutaneous access
C. Open ureterolithotomy
D. Ureteroscopic retrieval (Correct Answer)

Explanation: **Explanation:** The management of ureteric calculi depends on the size, location, and presence of complications. For a **10-mm calculus in the lower ureter**, **Ureteroscopic Retrieval (URS)** is the gold standard treatment. **Why URS is the correct choice:** 1. **Location:** The lower ureter is anatomically shielded by the bony pelvis, making it difficult to target with ESWL. URS provides direct access and high stone-free rates for distal stones. 2. **Size:** Stones >10 mm have a low probability of spontaneous passage and require active intervention. 3. **Complications:** The presence of proximal hydroureteronephrosis indicates significant obstruction, necessitating prompt relief which URS (with or without stenting) provides effectively. **Why other options are incorrect:** * **ESWL (Option A):** While effective for upper ureteric stones <10 mm, its efficacy decreases in the lower ureter due to pelvic bone interference and difficulty in localization. * **Antegrade Percutaneous Access (Option B):** This is typically reserved for large (>1.5 cm) stones in the upper ureter or when retrograde access fails. It is too invasive for a simple lower ureteric stone. * **Open Ureterolithotomy (Option C):** This is now considered a "last resort" procedure, reserved for very large, impacted stones or when endoscopic/minimally invasive methods fail. **Clinical Pearls for NEET-PG:** * **Ureteric Stone Management Guidelines:** * **<5 mm:** Medical Expulsive Therapy (MET) using Alpha-blockers (Tamsulosin). * **Upper Ureter (<1 cm):** ESWL is the first line. * **Lower Ureter:** URS is the first line regardless of size (if >5 mm). * **Stone Composition:** Calcium oxalate monohydrate and Cystine stones are resistant to ESWL; URS/Laser lithotripsy is preferred. * **Emergency:** If a stone is associated with fever/infection (pyonephrosis), the priority is **drainage** (PCN or DJ stent), not definitive stone removal.

Question 460: Which of the following lasers is used in the treatment of benign prostatic hyperplasia and urinary calculi?

A. C02 laser
B. Excimer laser
C. Ho: YAG laser (Correct Answer)
D. Nd: YAG laser

Explanation: **Explanation:** The **Holmium: YAG (Ho:YAG)** laser is currently the "gold standard" multipurpose laser in urology because it operates at a wavelength of **2100 nm**, which is highly absorbed by water. 1. **Why it is correct:** The Ho:YAG laser works via a **thermo-mechanical mechanism**. When used for **urinary calculi**, it creates a vaporization bubble that pulverizes stones of all chemical compositions (Lithotripsy). When used for **BPH**, its shallow tissue penetration (0.4 mm) allows for precise tissue ablation and coagulation (HoLEP—Holmium Laser Enucleation of the Prostate) with minimal collateral thermal damage, making it safe and effective for both soft tissue and hard stones. 2. **Why the others are incorrect:** * **CO2 Laser (10,600 nm):** It is strongly absorbed by water but cannot be transmitted through flexible fiberoptics or liquid environments, making it unsuitable for endoscopic urological procedures. * **Excimer Laser:** This is an ultraviolet laser used primarily in ophthalmology (LASIK) and angioplasty; it lacks the power for stone fragmentation or prostate resection. * **Nd:YAG Laser (1064 nm):** While used in the past for BPH (VLAP), it has deep tissue penetration (up to 10 mm), leading to unpredictable sloughing, significant postoperative edema, and no effective stone-fragmenting properties. **High-Yield Clinical Pearls for NEET-PG:** * **HoLEP** is the procedure of choice for very large prostates (>80-100g) as an alternative to open prostatectomy. * **KTP (Potassium Titanyl Phosphate) Laser:** Also known as the "GreenLight" laser; used for photoselective vaporization of the prostate (PVP) but **cannot** treat stones. * **Thulium Laser:** Offers even shallower penetration than Holmium, providing excellent hemostasis for BPH.

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Hematuria Evaluation

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Urinary Calculi

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Benign Prostatic Hyperplasia

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Prostate Cancer

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Bladder Cancer

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Renal Cell Carcinoma

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Testicular Tumors

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Urinary Tract Infections

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Urinary Incontinence

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Urology — MCQs

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