Urology Practice Questions

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

Calcium oxalate monohydrate. **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.

Q: An 18-year-old patient presents with acute abdominal pain, vomiting, and on clinical examination, loin tenderness is present. The patient denies any history of fever. What is the most likely diagnosis?

Acute testicular torsion. **Explanation:** The correct answer is **Acute testicular torsion**. In adolescent males (the peak age group), testicular torsion often presents with sudden-onset, severe abdominal or inguinal pain rather than localized scrotal pain. This is due to the shared nerve supply; the testis and the appendix share the T10 sympathetic dermatome. **Loin tenderness** (referred pain to the flank/lumbar region) is a classic, high-yield clinical sign of torsion that often leads to misdiagnosis as a renal or abdominal condition. **Why other options are incorrect:** * **Acute appendicitis:** While it causes abdominal pain and vomiting, it typically presents with periumbilical pain shifting to the Right Iliac Fossa (RIF), not loin tenderness. * **Acute pyelonephritis:** This would typically present with high-grade fever, chills, and urinary symptoms (dysuria/frequency), which are absent in this patient. * **Acute diverticulitis:** This is rare in an 18-year-old; it typically affects older patients and presents with Left Lower Quadrant pain ("left-sided appendicitis"). **NEET-PG High-Yield Pearls:** * **Golden Period:** Surgical detorsion must ideally occur within **6 hours** to ensure a >90% salvage rate. * **Clinical Signs:** Look for a **high-riding testis** with a horizontal lie (Bell-clapper deformity) and a **negative Prehn’s sign** (pain is not relieved by lifting the scrotum). * **Reflex:** The **Cremasteric reflex is absent** in testicular torsion (the most sensitive physical finding). * **Rule of Thumb:** In any adolescent male with acute abdominal pain, a genital examination is mandatory to rule out torsion.

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

Ureteroscopic retrieval. **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 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). * **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.

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

Ho: YAG laser. **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.

Q: Which of the following is the most troublesome source of bleeding during a radical retropubic prostatectomy?

Dorsal venous complex. ### Explanation **Correct Answer: A. Dorsal venous complex** The **Dorsal Venous Complex (DVC)**, also known as the Santorini plexus, is the most significant source of intraoperative hemorrhage during a radical retropubic prostatectomy. Anatomically, the DVC lies within the endopelvic fascia, anterior to the prostate and the urethra. During the retropubic approach, the surgeon must divide the puboprostatic ligaments and control this high-pressure venous plexus to serialize the apex of the prostate and the urethra. Because these veins are thin-walled, lack valves, and are tethered to the surrounding fascia, they do not collapse easily when injured, leading to profuse bleeding. **Why the other options are incorrect:** * **B & C. Inferior and Superior Vesical Pedicles:** While the inferior vesical artery provides the primary arterial supply to the prostate, these pedicles are typically ligated in a controlled, lateral fashion during the dissection of the "prostatic pedicles." [1] They are less likely to cause "troublesome" or unexpected massive bleeding compared to the DVC. * **D. Seminal Vesicular Artery:** This is a smaller branch encountered during the posterior dissection. While it requires control, its caliber and location do not pose the same surgical challenge or volume of blood loss as the DVC. **Clinical Pearls for NEET-PG:** * **Santorini’s Plexus:** Another name for the dorsal venous complex; it communicates with the internal pudendal vein and the vesical venous plexus. * **Batson’s Plexus:** The prostatic venous plexus communicates with the vertebral venous plexus (valveless), explaining why prostate cancer characteristically metastasizes to the **lumbar spine**. * **Nerve Sparing:** The cavernous nerves (responsible for erections) run posterolateral to the prostate; careful management of the DVC is crucial to avoid damaging these nerves during apical dissection.

Q: Barley water-like fluid is present in which of the following conditions?

Spermatocele. **Explanation:** The correct answer is **Spermatocele**. A **spermatocele** is a retention cyst arising from the head of the epididymis or the efferent ductules. It typically contains a milky, opalescent fluid described classically as **"barley water-like."** This characteristic appearance is due to the presence of dead or degenerated spermatozoa suspended in the fluid. On microscopic examination, these non-motile spermatozoa are a diagnostic hallmark. **Analysis of Incorrect Options:** * **Chylocele (A):** This is the accumulation of chyle (lymph) within the tunica vaginalis, usually due to filariasis. The fluid is **milky white** and rich in triglycerides, but it lacks the "barley water" granular appearance and spermatozoa. * **Hydrocele (B):** This is an accumulation of serous fluid between the layers of the tunica vaginalis. The fluid is typically **amber or straw-colored**, clear, and rich in albumin. * **Epididymal Cyst (C):** While similar in location to a spermatocele, an epididymal cyst contains **clear, crystal-like fluid** (resembling water) and does not contain spermatozoa. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Spermatoceles are always located **above and behind** the testis (distinct from the testis). * **Transillumination:** Like hydroceles, spermatoceles are transilluminant, but the light may be slightly more diffused due to the opalescent fluid. * **Clinical Sign:** It often feels like a "third testis" or a "bag of seeds" on palpation. * **Management:** Most are asymptomatic and require no treatment; surgical excision is reserved for large or painful cysts.

Q: Which of the following is NOT a feature of carcinoma of the penis?

Transitional cell carcinoma. **Explanation:** **1. Why Option D is the correct answer:** Carcinoma of the penis is almost exclusively **Squamous Cell Carcinoma (SCC)**, accounting for over 95% of cases. It arises from the epithelium of the glans or the inner surface of the prepuce. **Transitional cell carcinoma (TCC)**, also known as urothelial carcinoma, typically arises from the lining of the urinary tract (bladder, ureters, or renal pelvis) and is not a primary feature of penile cancer. **2. Analysis of incorrect options:** * **Option A:** Neonatal circumcision is a well-established protective factor. It prevents the accumulation of **smegma** (a potential carcinogen) and chronic inflammation (balanoposthitis), providing near-total immunity against penile cancer. Note: Circumcision in adulthood does not offer the same level of protection. * **Option B:** The primary route of spread for penile cancer is lymphatic. The **inguinal lymph nodes** (sentinel nodes) are the first site of metastasis. The presence of nodal involvement is the most important prognostic factor. * **Option C:** Surgery remains the mainstay of treatment. Depending on the stage, this ranges from organ-sparing procedures (laser, wide local excision) to partial or total penectomy with ilio-inguinal lymph node dissection. **3. High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Phimosis (most common), HPV 16 and 18, smoking, and chronic inflammation. * **Pre-malignant lesions:** Bowen’s disease (erythroplasia of Queyrat) and Leukoplakia. * **Staging:** The **Jackson Staging** or TNM system is used. * **Sentinel Node:** The **Node of Cloquet** (deep inguinal node) is a critical landmark in surgical dissection.

Question 1

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

Accepted Answer

Calcium oxalate monohydrate

Answer

Calcium oxalate dihydrate

Answer

Uric acid

Answer

Struvite

Question 2

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?

Accepted Answer

Ultrasonography

Answer

Urinary cytology

Answer

Cystoscopy

Answer

Retrograde pyelography

Question 3

An 18-year-old patient presents with acute abdominal pain, vomiting, and on clinical examination, loin tenderness is present. The patient denies any history of fever. What is the most likely diagnosis?

Accepted Answer

Acute testicular torsion

Answer

Acute appendicitis

Answer

Acute pyelonephritis

Answer

Acute diverticulitis

Question 4

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

Accepted Answer

Ureteroscopic retrieval

Answer

Extracorporeal shockwave lithotripsy

Answer

Antegrade percutaneous access

Answer

Open ureterolithotomy

Question 5

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

Accepted Answer

Ho: YAG laser

Answer

C02 laser

Answer

Excimer laser

Answer

Nd: YAG laser

Question 6

A patient with stage II transitional cell carcinoma of the bladder presents with hematuria. Which of the following statements regarding the management of her condition is true?

Accepted Answer

There is a 70% chance of requiring cystectomy in 5 years after TURP.

Answer

Cystoscopic fulguration is the standard treatment.

Answer

A history of smoking is not a risk factor.

Answer

There is no role for chemotherapy.

Question 7

What is the primary use of a Foley catheter in the urinary tract?

Accepted Answer

Irrigating the bladder

Answer

Continuous bladder drainage

Answer

Feeding gastrostomy

Answer

Diagnostic peritoneal lavage

Question 8

Which of the following is the most troublesome source of bleeding during a radical retropubic prostatectomy?

Accepted Answer

Dorsal venous complex

Answer

Inferior vesical pedicle

Answer

Superior vesical pedicle

Answer

Seminal vesicular artery

Question 9

Barley water-like fluid is present in which of the following conditions?

Accepted Answer

Spermatocele

Answer

Chylocele

Answer

Hydrocele

Answer

Epididymic cyst

Question 10

Which of the following is NOT a feature of carcinoma of the penis?

Accepted Answer

Transitional cell carcinoma

Answer

Circumcision soon after birth provides total immunity

Answer

Metastasis to inguinal nodes

Answer

Surgery is the treatment of choice

Urology — MCQs

Urology — MCQs

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