Urology Practice Questions

Q: Which of the following renal stones is purely radiolucent?

Xanthine. **Explanation:** The radiopacity of a renal stone depends on its effective atomic number and density. Stones containing calcium or heavy elements appear radiopaque, while those composed of organic compounds without such elements are radiolucent. **Why Xanthine is Correct:** Xanthine stones are **purely radiolucent**. They occur due to a rare genetic deficiency of the enzyme xanthine oxidase or as a side effect of Allopurinol therapy. Because xanthine is a pure organic compound lacking high-atomic-weight minerals, it does not attenuate X-rays and remains invisible on plain radiographs (KUB). **Analysis of Incorrect Options:** * **Struvite (Magnesium Ammonium Phosphate):** These are **radiopaque**. Often associated with Proteus infections and staghorn calculi, they contain magnesium and phosphate which provide moderate density. * **Cystine:** These are **faintly radiopaque** (often described as "ground-glass" appearance). While organic, they contain sulfur atoms which provide enough density to be visible on X-rays. * **Calcium Oxalate:** These are **highly radiopaque**. As the most common type of renal stone, the high calcium content makes them easily visible on plain films. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Radiolucent Stones (U.X.):** **U**ric acid and **X**anthine. (Note: Uric acid is the most common radiolucent stone; Xanthine is the rarest). * **Matrix Stones:** These are also radiolucent but rare, typically seen in patients with chronic UTIs. * **Investigation of Choice:** Non-contrast CT (NCCT) is the gold standard for all stones, as even "radiolucent" stones like uric acid and xanthine are visible (hyperdense) on CT. * **Indinavir Stones:** These are the only stones that are truly **radiolucent even on CT scan**.

Q: Which of the following is not a component of the classic triad associated with renal cell carcinoma?

Pyrexia. **Explanation:** The classic clinical triad of **Renal Cell Carcinoma (RCC)**, also known as Guyon’s triad, consists of **Hematuria, Flank Pain, and a Palpable Abdominal Mass**. **Pyrexia (Option D)** is the correct answer because, while it is a common systemic symptom of RCC (occurring in about 20% of cases as a paraneoplastic phenomenon due to IL-6 production), it is **not** part of the "classic triad." **Analysis of Options:** * **Hematuria (Option C):** The most common presenting symptom (approx. 40-50%). It is typically gross, painless, and intermittent. * **Pain (Option B):** Usually described as a dull ache in the flank region, caused by the stretching of the renal capsule. * **Mass (Option A):** A palpable, firm, non-tender mass in the loin. **Clinical Pearls for NEET-PG:** 1. **The "Too Late" Triad:** The classic triad is now seen in only **10% of patients** and usually indicates advanced or metastatic disease. Most RCCs today are detected incidentally via imaging ("incidentalomas"). 2. **Paraneoplastic Syndromes:** RCC is known as the **"Internist's Tumor"** because it produces various hormones. Common findings include erythrocytosis (EPO), hypercalcemia (PTHrP), and hypertension (Renin). 3. **Stauffer’s Syndrome:** Reversible hepatic dysfunction (elevated LFTs) in the absence of liver metastases. 4. **Left-sided Varicocele:** May occur if the tumor obstructs the left gonadal vein entry into the left renal vein.

Q: What is the color of a 16 French Foley catheter?

Orange. The color coding of Foley catheters is standardized internationally according to the **French (Fr) scale**, which measures the outer diameter of the catheter (1 Fr = 1/3 mm). This standardization allows for rapid identification during emergency procedures and routine bedside care. ### **Explanation of Options:** * **A. Orange (Correct):** A **16 French** catheter is color-coded orange. This is one of the most commonly used sizes for adult males and females, providing a balance between efficient drainage and patient comfort. * **B. Yellow:** This color corresponds to a **20 French** catheter. These are typically used when there is a need for faster drainage or when clots/debris are present in the urine. * **C. Blue:** This color corresponds to an **8 French** catheter. These are primarily used in the pediatric population. * **D. Black:** This color corresponds to a **10 French** catheter, also commonly used in pediatric or adolescent patients. ### **High-Yield Clinical Pearls for NEET-PG:** * **Size Calculation:** To find the diameter in millimeters, divide the French size by 3 (e.g., 18 Fr = 6 mm). * **Common Color Codes to Memorize:** * **12 Fr:** White * **14 Fr:** Green * **16 Fr:** Orange * **18 Fr:** Red * **22 Fr:** Violet/Purple * **Clinical Indication:** In cases of **acute urinary retention** due to BPH, a 16 or 18 Fr Coudé tip (curved) catheter is often preferred to bypass the prostatic bulk. * **Toxicology Link:** In the management of severe overdoses requiring **forced diuresis** or strict intake-output monitoring, a 16 Fr Foley is the standard choice for adult patients.

Q: Which of the following surgeries is indicated for the removal of a 3cm ameloblastoma involving the inferior border of the mandible?

Resection. **Explanation:** **Ameloblastoma** is a benign but locally aggressive odontogenic tumor with a high rate of recurrence. The management of this tumor is a high-yield topic for NEET-PG, focusing on the distinction between conservative and radical treatments. **Why Resection is Correct:** For a large (3cm) lesion involving the **inferior border of the mandible**, radical surgery in the form of **Segmental or Marginal Resection** is the treatment of choice. Because ameloblastoma tends to infiltrate the surrounding trabecular bone beyond its apparent radiological margins, a "safety margin" of 1–1.5 cm of healthy bone is required. Since the inferior border is involved, a segmental resection is often necessary to ensure complete removal and prevent recurrence, which can be as high as 50–90% with conservative methods. **Why Other Options are Incorrect:** * **Enucleation:** This involves "shelling out" the tumor. It is only considered for very small, unicystic variants. For a 3cm multicystic lesion, it carries an unacceptably high recurrence rate. * **Fulguration & Cryosurgery:** These are adjunctive treatments sometimes used after enucleation to kill residual cells. However, they are not primary treatments for a 3cm lesion involving the mandibular border, as they cannot guarantee the removal of deep infiltrative components. **Clinical Pearls for NEET-PG:** * **Most common site:** Posterior mandible (molar-ramus area). * **Radiological appearance:** "Soap bubble" or "Honeycombed" multilocular appearance. * **Histopathology:** "Vickers-Gorlin" criteria (palisading basal cells with reverse polarity). * **Gold Standard:** Wide local excision/Resection with 1–1.5 cm margins.

Q: Pain in the region of the penis in acute urethritis is typically experienced?

During micturition. ### Explanation The correct answer is **C. During micturition**. **Medical Concept:** Urethritis is the inflammation of the urethral mucosa, most commonly due to sexually transmitted infections (e.g., *Neisseria gonorrhoeae* or *Chlamydia trachomatis*). The pain associated with urethritis is a classic example of **"scalding" dysuria**. As acidic urine passes through the inflamed, sensitive, and often denuded urethral lining during the act of voiding, it causes immediate irritation and a burning sensation. Therefore, the pain is maximal **during micturition**. **Analysis of Incorrect Options:** * **A. Before micturition:** Pain before voiding is typically associated with **bladder distension** (e.g., acute cystitis or interstitial cystitis). The pain is relieved once the bladder is emptied and the tension on the bladder wall is reduced. * **B. After micturition:** Pain at the end of or after micturition (terminal dysuria) is characteristic of **trigonitis** or **posterior urethritis/prostatitis**. As the bladder collapses at the end of voiding, the inflamed mucosal surfaces of the trigone rub against each other, causing pain. * **D. Irrespective of micturition:** Constant pain in the penile region, unrelated to voiding, is more suggestive of conditions like **priapism, paraphimosis, or local trauma/abscess**, rather than simple urethritis. **High-Yield Clinical Pearls for NEET-PG:** * **Urethral Discharge:** Gonococcal urethritis typically presents with a profuse, creamy yellow discharge, whereas Non-gonococcal urethritis (NGU) presents with a scant, mucoid discharge. * **Two-Glass Test:** Used to localize the site of infection. If the first glass is turbid and the second is clear, it indicates **anterior urethritis**. If both are turbid, it suggests a more proximal infection (cystitis or prostatitis). * **Initial Dysuria:** Pain at the start of micturition usually points to an anterior urethral lesion.

Q: What is the most common type of cancer affecting the renal pelvis and upper ureter?

Transitional cell carcinoma. ### Explanation **Correct Option: A. Transitional Cell Carcinoma (TCC)** The entire urinary tract, from the renal calyces and pelvis down to the proximal urethra, is lined by **urothelium** (formerly known as transitional epithelium). Therefore, the most common malignancy arising from these structures is **Transitional Cell Carcinoma (TCC)**, now more commonly referred to as **Urothelial Carcinoma**. It accounts for over 90% of tumors in the renal pelvis and ureter. **Incorrect Options:** * **B. Adenocarcinoma:** This is a rare primary tumor of the renal pelvis, usually associated with chronic irritation or glandular metaplasia (cystitis glandularis). * **C. Squamous Cell Carcinoma (SCC):** While it can occur in the renal pelvis, it is much less common than TCC. It is strongly associated with **chronic irritation**, such as long-standing staghorn calculi or chronic infections. * **D. Nephroblastoma (Wilms Tumor):** This is a primary **embryonal renal parenchymal tumor** seen in children. It does not arise from the urothelial lining of the collecting system. **Clinical Pearls for NEET-PG:** 1. **Field Change Effect:** Urothelial tumors exhibit "polychronotopicity." A patient with renal pelvis TCC has a 30–50% chance of developing a synchronous or metachronous bladder tumor. 2. **Risk Factors:** Smoking (most common), Balkan endemic nephropathy, and exposure to aromatic amines (dyes). 3. **Gold Standard Investigation:** CT Urography (shows a "filling defect"). 4. **Treatment of Choice:** Radical nephroureterectomy with excision of a bladder cuff (to prevent recurrence in the distal ureteric stump).

Q: Which of the following closely mimics testicular malignancy?

Haematocele. **Explanation** The correct answer is **Haematocele**. **Why Haematocele mimics Testicular Malignancy:** A chronic haematocele is the most common condition to be mistaken for a testicular tumor. Both conditions typically present as a **painless, firm-to-hard, heavy scrotal swelling** that does **not transilluminate**. In chronic cases, the blood within the tunica vaginalis undergoes organization, leading to thickening and fibrosis of the sac. This creates a solid, irregular mass-like consistency on palpation, making it clinically indistinguishable from a malignancy without imaging (Ultrasound) or surgical exploration. **Why other options are incorrect:** * **Hydrocele:** While it causes scrotal enlargement, it is typically soft, fluctuant, and **transilluminates** brilliantly. Malignancy is solid and opaque. * **Spermatocele:** This is a retention cyst of the efferent ductules. It is felt as a distinct, globular swelling **separate from and above the testis** (like a "third testis"), whereas malignancy involves the body of the testis itself. * **Cyst of Epididymis:** Similar to a spermatocele, these are fluid-filled structures located in the epididymis and are easily distinguishable from the testicular parenchyma on palpation. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of Thumb:** Any solid, non-transilluminating testicular mass is considered **malignant until proven otherwise**. * **Diagnostic Gold Standard:** Scrotal Ultrasound (USG) is the first-line investigation to differentiate intra-testicular from extra-testicular masses. * **Surgical Approach:** If malignancy is suspected, the surgical approach is always **Radical Inguinal Orchidectomy**. A trans-scrotal biopsy is strictly contraindicated as it risks lymphatic seeding to the inguinal nodes.

Q: Which is the most common cause of urinary retention in an elderly man?

Benign prostatic hyperplasia. **Explanation:** **Benign Prostatic Hyperplasia (BPH)** is the most common cause of bladder outlet obstruction and subsequent urinary retention in elderly men. As a man ages, the periurethral (transition) zone of the prostate undergoes glandular and stromal proliferation under the influence of Dihydrotestosterone (DHT). This enlargement compresses the prostatic urethra, increasing resistance to urine flow and leading to Lower Urinary Tract Symptoms (LUTS) or acute/chronic retention. **Analysis of Options:** * **Benign Prostatic Hyperplasia (Correct):** Histological evidence of BPH is present in approximately 50% of men by age 60 and 90% by age 85, making it the statistically dominant cause. * **Carcinoma of the Prostate:** While common in elderly men, it typically arises in the **peripheral zone**. It usually remains asymptomatic until advanced stages and is a much less frequent cause of acute retention compared to BPH. * **Bladder Neck Hypertrophy:** This is often a secondary change (compensatory) due to chronic obstruction or seen in specific conditions like Marion’s disease (primary bladder neck obstruction), but it is not the primary cause in the general elderly population. * **Constriction (Stricture):** Urethral strictures are usually the result of trauma, instrumentation, or infection (gonococcal). While they cause retention, they are less common than BPH in the elderly. **Clinical Pearls for NEET-PG:** * **Zone involved:** BPH affects the **Transition Zone**; Prostate Cancer affects the **Peripheral Zone**. * **First-line Medical Management:** Alpha-blockers (e.g., Tamsulosin) to reduce dynamic obstruction. * **Gold Standard Surgery:** TURP (Transurethral Resection of the Prostate). * **Most common site of metastasis in Prostate Cancer:** Lumbar spine (via Batson’s plexus).

Question 1

Which of the following renal stones is purely radiolucent?

Accepted Answer

Xanthine

Answer

Struvite

Answer

Cystine

Answer

Calcium oxalate

Question 2

Which of the following is not a component of the classic triad associated with renal cell carcinoma?

Accepted Answer

Pyrexia

Answer

Mass

Answer

Pain

Answer

Hematuria

Question 3

A 28-year-old white male presents with asymptomatic testicular enlargement. Which of the following statement(s) is/are true concerning his diagnosis and management?

Accepted Answer

The diagnosis of seminoma should be followed by postoperative radiation therapy

Answer

Tumour markers, beta-fetoprotein (AFP) and human chorionic gonadotropin (HCG) will both be of value in the patient regardless of his ultimate tissue type

Answer

Orchiectomy should be performed via a scrotal approach

Answer

With current adjuvant chemotherapy regimens, retroperitoneal lymphadenectomy is no longer indicated for non-seminomatous testicular tumours

Question 4

What causes ureteric colic due to a stone?

Accepted Answer

Increased peristalsis of the ureter to overcome the obstruction

Answer

Stretching of the renal capsule due to back pressure

Answer

Irritation of the intramural ureter

Answer

Extravasation of urine

Question 5

What is the color of a 16 French Foley catheter?

Accepted Answer

Orange

Answer

Yellow

Answer

Blue

Answer

Black

Question 6

Which of the following surgeries is indicated for the removal of a 3cm ameloblastoma involving the inferior border of the mandible?

Accepted Answer

Resection

Answer

Enucleation

Answer

Fulgration

Answer

Cryosurgery

Question 7

Pain in the region of the penis in acute urethritis is typically experienced?

Accepted Answer

During micturition

Answer

Before micturition

Answer

After micturition

Answer

Irrespective of micturition

Question 8

What is the most common type of cancer affecting the renal pelvis and upper ureter?

Accepted Answer

Transitional cell carcinoma

Answer

Adenocarcinoma

Answer

Squamous cell carcinoma

Answer

Nephroblastoma

Question 9

Which of the following closely mimics testicular malignancy?

Accepted Answer

Haematocele

Answer

Hydrocele

Answer

Spermatocele

Answer

Cyst of epididymis

Question 10

Which is the most common cause of urinary retention in an elderly man?

Accepted Answer

Benign prostatic hyperplasia

Answer

Constriction

Answer

Bladder neck hypertrophy

Answer

Carcinoma of the prostate

Urology — MCQs

Urology — MCQs

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