Urology Practice Questions

Q: A 23-year-old male known to have sickle cell anemia presents to the emergency department with a painful erection that started 3 hours ago. What is this condition called?

Priapism. **Explanation:** The clinical presentation of a prolonged, painful erection (lasting >4 hours) in a patient with sickle cell anemia is a classic description of **Priapism**. **1. Why Priapism is correct:** Priapism is a urological emergency characterized by a persistent erection unrelated to sexual stimulation. In patients with **Sickle Cell Anemia**, it is typically the **Ischemic (Low-flow)** type. The underlying mechanism involves the sickling of red blood cells within the corpora cavernosa, leading to venous stasis, outflow obstruction, and subsequent hypoxia and acidosis within the penile tissue. **2. Why the other options are incorrect:** * **Balanitis:** This refers to the inflammation of the glans penis, usually due to infection (fungal/bacterial) or poor hygiene. It presents with redness, itching, and discharge, not a persistent erection. * **Hypospadias:** A congenital anomaly where the urethral meatus opens on the ventral aspect of the penis. It is a structural defect present from birth. * **Peyronie Disease:** A condition involving the formation of fibrous plaques in the tunica albuginea, leading to penile curvature and painful erections during intercourse, but not a continuous, spontaneous state of tumescence. **Clinical Pearls for NEET-PG:** * **Ischemic Priapism** is a "compartment syndrome" of the penis. Blood gas analysis of the aspirate shows **low pO2, high pCO2, and low pH**. * **Management:** Initial steps include hydration and analgesia. Definitive treatment involves **aspiration of blood** followed by intracavernosal injection of alpha-agonists (e.g., **Phenylephrine**). * If conservative measures fail, surgical shunts (e.g., Winter’s or Quackels shunt) are performed. * **Stuttering Priapism:** Recurrent, short-lived episodes common in sickle cell patients; often managed with hormonal therapy (GnRH analogs) or PDE5 inhibitors (prophylactically).

Q: Subcapsular orchiectomy is done for cancer of?

Prostate. **Explanation:** **Subcapsular orchiectomy** (also known as Riba’s operation) is a surgical procedure where the androgen-producing glandular tissue (the parenchyma) is removed while leaving the tunica albuginea and epididymis intact. **Why Prostate Cancer is the Correct Answer:** Prostate cancer is an **androgen-dependent tumor**. The primary goal of treatment in metastatic or advanced cases is **Androgen Deprivation Therapy (ADT)**. Since 95% of testosterone is produced by the Leydig cells in the testes, a bilateral orchiectomy serves as "surgical castration," rapidly reducing serum testosterone to castrate levels (<50 ng/dL). The subcapsular technique is preferred over total orchiectomy for prostate cancer because it is **psychologically less traumatic** for the patient, as the scrotum does not feel entirely empty. **Why Other Options are Incorrect:** * **Testicular Cancer:** The standard of care is **Radical Inguinal Orchiectomy**. A subcapsular approach is contraindicated because it violates the testicular tunics, risking local tumor spillage and altering the lymphatic drainage. * **Penis & Urethra Cancer:** These malignancies are not primarily driven by testosterone. Treatment usually involves local excision, partial/total penectomy, and lymph node dissection, rather than hormonal manipulation via orchiectomy. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for ADT:** While LHRH agonists (e.g., Leuprolide) are common, bilateral orchiectomy remains the "gold standard" for rapid testosterone depletion. * **Indication:** Primarily used for **Metastatic Prostate Cancer (Stage D)** or as palliative care for bone pain. * **Comparison:** Subcapsular orchiectomy is as effective as total orchiectomy in lowering testosterone but offers a better cosmetic/psychological outcome.

Q: Proteus organisms are known to cause which type of kidney stones?

Struvite stones. **Explanation:** The correct answer is **Struvite stones (Option A)**. **Mechanism:** *Proteus* species (along with *Klebsiella*, *Pseudomonas*, and *Staphylococcus*) are **urease-producing organisms**. The enzyme urease hydrolyzes urea into ammonia and carbon dioxide ($NH_2CONH_2 + H_2O \rightarrow 2NH_3 + CO_2$). The resulting ammonia increases the urinary pH, making it **alkaline** (pH > 7.2). In this alkaline environment, phosphate, magnesium, and ammonium ions precipitate to form **Struvite** (Magnesium Ammonium Phosphate) and carbonate apatite stones. **Analysis of Incorrect Options:** * **B. Calcium oxalate stones:** These are the most common type of kidney stones globally. They are typically associated with hypercalciuria or hyperoxaluria and usually form in acidic or neutral urine, not due to urea-splitting infections. * **C. Cystine stones:** These occur due to an autosomal recessive defect in the transport of dibasic amino acids (COLA: Cystine, Ornithine, Lysine, Arginine). They form in **acidic urine** and have a characteristic hexagonal shape. * **D. Xanthine stones:** These are rare and typically result from a genetic deficiency of the enzyme xanthine oxidase or the use of allopurinol. **High-Yield Clinical Pearls for NEET-PG:** 1. **Staghorn Calculi:** Struvite stones are the most common cause of large, branched "staghorn" calculi that fill the renal pelvis and calyces. 2. **Radiopacity:** Struvite stones are **radio-opaque** (though less dense than calcium oxalate). 3. **Microscopy:** On urine microscopy, struvite crystals appear as **"Coffin-lid"** shaped crystals. 4. **Treatment:** Management often requires complete surgical removal (e.g., PCNL) because the stones harbor bacteria within their matrix, leading to recurrent infections if any fragments remain.

Q: Urinary catheterization is indicated in cases of acute retention of urine, except in which of the following conditions?

Rupture. In urological emergencies, the primary goal of managing acute urinary retention (AUR) is to decompress the bladder. However, the method of decompression depends on the integrity of the urinary tract. **Why "Rupture" is the correct answer:** In cases of suspected **urethral rupture** (often associated with pelvic fractures or straddle injuries), blind urethral catheterization is **strictly contraindicated**. Attempting to pass a catheter can convert a partial urethral tear into a complete transection, introduce infection into a perivesical hematoma, or create a false passage. Clinical signs such as **blood at the meatus**, a **high-riding prostate** on digital rectal examination, or **perineal ecchymosis** (butterfly bruising) mandate a **Retrograde Urethrogram (RUG)** before any instrumentation. In these cases, a Suprapubic Cystostomy (SPC) is the preferred method of bladder drainage. **Analysis of incorrect options:** * **Stricture:** While a urethral stricture makes catheterization difficult, it is not an absolute contraindication. If a standard Foley fails, smaller caliber catheters or filiforms and followers are used. * **Postoperative:** AUR is a common complication after spinal anesthesia or pelvic surgery; urethral catheterization is the standard first-line management. * **Carcinoma of the Prostate:** Prostatic enlargement (benign or malignant) is a leading cause of AUR. Catheterization is indicated, though a Coudé tip catheter may be required to bypass the prostatic obstruction. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation** for suspected urethral injury: Retrograde Urethrogram (RUG). * **Triad of Urethral Injury:** Blood at meatus, inability to void, and palpable distended bladder. * **Membranous Urethra:** The most common site of rupture in pelvic fractures. * **Bulbar Urethra:** The most common site of rupture in "straddle" (fall-a-stride) injuries.

Q: Magnesium-ammonium phosphate stones are usually secondary to urinary tract infection with which of the following organisms?

Proteus species. **Explanation:** **Magnesium-ammonium phosphate (Struvite) stones**, also known as triple phosphate or infection stones, are formed due to the presence of **urease-producing bacteria**. The underlying mechanism involves the enzyme **urease**, which hydrolyzes urea into ammonia and carbon dioxide. This process increases urinary ammonia levels and raises the urinary pH (alkaline urine, typically >7.2). In this alkaline environment, the solubility of phosphate decreases, leading to the precipitation of magnesium, ammonium, and phosphate ions. * **Proteus species (Correct Answer):** This is the most common urease-producing organism associated with these stones. Proteus is highly potent in splitting urea, leading to the rapid formation of large, branched **Staghorn calculi** that fill the renal pelvis and calyces. * **Escherichia coli (Incorrect):** While E. coli is the most common cause of UTIs overall, it is generally **not** a urease-producer. Therefore, it is rarely associated with struvite stone formation. * **Klebsiella (Incorrect):** Although some strains of Klebsiella can produce urease, it is far less common and less potent than Proteus in the context of stone pathogenesis. * **Enterococcus (Incorrect):** These are gram-positive cocci that do not typically produce urease and are not primary drivers of struvite stone formation. **High-Yield Clinical Pearls for NEET-PG:** * **Composition:** Magnesium Ammonium Phosphate + Calcium Carbonate. * **Radiology:** These stones are **radiopaque** and typically present as a **Staghorn calculus**. * **Risk Factors:** More common in females due to a higher incidence of UTIs. * **Management:** Requires complete surgical removal (e.g., PCNL) because the stones harbor bacteria within their matrix, leading to recurrent infections if any fragments remain.

Q: All of the following can be seen in hypernephroma, except:

None of the above. **Explanation:** Hypernephroma, now more commonly known as **Renal Cell Carcinoma (RCC)**, is famously referred to as the "Internist's Tumor" because of its diverse systemic manifestations and paraneoplastic syndromes. The correct answer is **None of the above** because all three listed conditions are well-recognized features of the disease. 1. **Polycythemia (Option A):** RCC can produce ectopic **Erythropoietin (EPO)**, which stimulates the bone marrow to increase red blood cell production. While anemia is more common in RCC, polycythemia occurs in about 1–5% of cases. 2. **Renal Vein Thrombosis (Option B):** RCC has a unique propensity for **angioinvasion**. The tumor often forms a "tumor thrombus" that extends into the renal vein and can propagate further into the Inferior Vena Cava (IVC), sometimes reaching the right atrium. 3. **Hypertension (Option C):** This occurs in up to 40% of patients. It can be caused by the secretion of **Renin** by the tumor, compression of the intrarenal vasculature (Goldblatt phenomenon), or hypercalcemia. **Clinical Pearls for NEET-PG:** * **Classic Triad:** Hematuria, Flank pain, and Palpable mass (seen in only 10% of cases; signifies advanced disease). * **Stauffer’s Syndrome:** Reversible hepatic dysfunction (elevated LFTs) in the absence of liver metastases. * **Left-sided Varicocele:** Occurs if the tumor thrombus obstructs the left renal vein, preventing drainage of the left gonadal vein. * **Most common histological subtype:** Clear cell carcinoma (originates from the Proximal Convoluted Tubule).

Q: Which of the following is true about transitional cell carcinoma of the urinary bladder?

All of the above. **Explanation:** Bladder cancer is the second most common urological malignancy, with **Transitional Cell Carcinoma (TCC)**, also known as Urothelial Carcinoma, accounting for over 90% of cases. The etiology is multifactorial, involving chronic irritation and exposure to environmental carcinogens. * **Smoking (Option A):** This is the **most significant risk factor** for TCC, responsible for approximately 50% of cases. Carcinogens like alpha and beta-naphthylamine are inhaled and excreted in the urine, leading to "field cancerization" of the urothelium. * **Aniline Dyes (Option C):** Occupational exposure in the rubber, leather, textile, and printing industries is a classic risk factor. Chemicals such as benzidine and 2-naphthylamine are potent urothelial carcinogens. * **Schistosoma haematobium (Option B):** While *Schistosoma* is most famously associated with **Squamous Cell Carcinoma (SCC)** due to chronic irritation, it is also a recognized risk factor for the development of **Transitional Cell Carcinoma**, particularly in endemic areas like the Nile Valley. Since all three factors contribute to the pathogenesis of bladder cancer, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Most common presentation:** Painless gross hematuria (seen in 85% of patients). * **Gold Standard Investigation:** Cystoscopy with biopsy. * **Schistosomiasis:** Classically causes SCC (Squamous), but can cause TCC. * **Drugs:** Long-term use of **Cyclophosphamide** (metabolite Acrolein) and **Phenacetin** abuse are high-yield risk factors for TCC. * **Chronic Irritation:** Long-term indwelling catheters or bladder stones predispose primarily to Squamous Cell Carcinoma.

Question 1

A 23-year-old male known to have sickle cell anemia presents to the emergency department with a painful erection that started 3 hours ago. What is this condition called?

Accepted Answer

Priapism

Answer

Balanitis

Answer

Hypospadias

Answer

Peyronie disease

Question 2

Maximum chances of ureteric injury are associated with which gynecological procedure?

Accepted Answer

Wertheim hysterectomy

Answer

Total abdominal hysterectomy (TAH)

Answer

Anterior colporrhaphy

Answer

Vaginal hysterectomy

Question 3

Subcapsular orchiectomy is done for cancer of?

Accepted Answer

Prostate

Answer

Testes

Answer

Penis

Answer

Urethra

Question 4

A 50-year-old male presented to the ER with complaints of inability to pass urine after a recent accident. On examination, he has a scrotal hematoma, blood at the urethral meatus, and a high-riding prostate. A retrograde urethrogram has been performed. What should be the next step in the management of the patient?

Accepted Answer

Foley's catheterization

Answer

Immediate surgical repair of the urethra

Answer

Diuretic to increase urine output

Answer

Conservative management

Question 5

Proteus organisms are known to cause which type of kidney stones?

Accepted Answer

Struvite stones

Answer

Calcium oxalate stones

Answer

Cystine stones

Answer

Xanthine stones

Question 6

Which of the following statements is true regarding the management of a patient with hematuria diagnosed to have Stage II Transitional Cell Carcinoma of the bladder?

Accepted Answer

There is a 70% chance of requiring cystectomy within 5 years after transurethral resection.

Answer

Cystoscopic fulguration is the standard treatment.

Answer

History of smoking is not a risk factor.

Answer

There is no role for chemotherapy.

Question 7

Urinary catheterization is indicated in cases of acute retention of urine, except in which of the following conditions?

Accepted Answer

Rupture

Answer

Stricture

Answer

Postoperative

Answer

Carcinoma of the prostate

Question 8

Magnesium-ammonium phosphate stones are usually secondary to urinary tract infection with which of the following organisms?

Accepted Answer

Proteus species

Answer

Escherichia coli

Answer

Klebsiella

Answer

Enterococcus

Question 9

All of the following can be seen in hypernephroma, except:

Accepted Answer

None of the above

Answer

Polycythemia

Answer

Renal vein thrombosis

Answer

Hypertension

Question 10

Which of the following is true about transitional cell carcinoma of the urinary bladder?

Accepted Answer

All of the above

Answer

Smoking predisposes to transitional cell carcinoma of the urinary bladder.

Answer

Schistosoma infection predisposes to transitional cell carcinoma of the urinary bladder.

Answer

Exposure to aniline dyes predisposes to transitional cell carcinoma of the urinary bladder.

Urology — MCQs

Urology — MCQs

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