Urology Practice Questions

Q: Which of the following brain tumors is highly vascular in nature?

Glioblastoma. **Explanation:** **Glioblastoma (GBM)**, a Grade IV astrocytoma, is characterized by intense **angiogenesis** and is one of the most vascularized tumors in the human body. The hallmark histological features of GBM include microvascular proliferation (forming "glomeruloid bodies") and areas of necrosis with pseudopalisading cells. This extreme vascularity is driven by the high expression of Vascular Endothelial Growth Factor (VEGF), making it the most vascular option among the choices. **Analysis of Incorrect Options:** * **Meningiomas:** While these are highly vascular extra-axial tumors (often showing a "sunburst" appearance on angiography), they are generally less aggressive and have lower rates of neo-angiogenesis compared to the malignant proliferation seen in Glioblastoma. * **CP Angle Epidermoid:** These are "pearly tumors" arising from ectodermal remnants. They are characteristically **avascular** and do not enhance on contrast CT/MRI. * **Pituitary Adenomas:** While well-perfused, they do not exhibit the pathological neo-angiogenesis or the degree of hypervascularity seen in high-grade gliomas. **High-Yield Clinical Pearls for NEET-PG:** * **Imaging Gold Standard:** Contrast-enhanced MRI is the investigation of choice for GBM, typically showing a **ring-enhancing lesion** with central necrosis. * **Most Vascular CNS Tumor:** While GBM is highly vascular, the most vascular tumor of the CNS overall is often considered to be **Hemangioblastoma** (frequently associated with Von Hippel-Lindau syndrome). * **Histology Keyword:** Look for **"Glomeruloid bodies"** (tufts of multilayered proliferating endothelial cells) to identify high-grade vascularity in GBM.

Q: Which structure is injured during the excision of a ranula?

Submandibular duct. **Explanation:** A **ranula** is a clinical term for a mucous extravasation cyst or a mucous retention cyst occurring specifically in the floor of the mouth. It typically arises from the **sublingual gland**. **Why the Submandibular Duct is the Correct Answer:** The submandibular duct (Wharton’s duct) runs along the floor of the mouth, passing from lateral to medial and crossing the lingual nerve. During the surgical excision or marsupialization of a ranula, the duct is at high risk of injury because it lies in the immediate surgical field, often draped over or compressed by the cyst. Damage to this duct can lead to obstructive sialadenitis of the submandibular gland. **Analysis of Incorrect Options:** * **A. Parotid duct (Stensen’s duct):** This duct opens opposite the second upper molar tooth in the buccal mucosa. It is anatomically distant from the floor of the mouth where a ranula is located. * **B. Facial artery:** While the facial artery is closely related to the submandibular gland, it runs deep to the mandible and through the submandibular triangle. It is not encountered during the intra-oral excision of a superficial ranula. * **C. Lingual nerve:** Although the lingual nerve is in the floor of the mouth, it lies deeper and more medial/inferior to the submandibular duct in this specific region. While it is at risk in deep dissections (like a "Plunging Ranula"), the submandibular duct is the structure most intimately related to the cyst wall. **High-Yield Clinical Pearls for NEET-PG:** * **Source:** Most ranulas arise from the **sublingual gland** (specifically the glands of Rivinus). * **Plunging Ranula:** A clinical variant that herniates through the **mylohyoid muscle** to present as a swelling in the neck. * **Treatment of Choice:** Complete excision of the ranula along with the **offending sublingual gland** to prevent recurrence. Marsupialization has a higher recurrence rate.

Q: Denver shunt is used in which condition?

Ascites. **Explanation:** The **Denver shunt** is a type of **peritoneovenous shunt (PVS)** specifically designed for the management of **refractory ascites**. **1. Why Ascites is Correct:** In patients with intractable ascites (often due to cirrhosis or malignancy), fluid accumulates in the peritoneal cavity. The Denver shunt consists of a catheter with a **pressure-sensitive one-way valve** and a small subcutaneous pump chamber. It is surgically implanted to divert ascitic fluid from the peritoneum into the internal jugular vein or superior vena cava. Unlike the LeVeen shunt (which is passive), the Denver shunt allows for manual pumping to clear debris and maintain patency. **2. Why Other Options are Incorrect:** * **Dialysis:** Dialysis utilizes an Arteriovenous (AV) fistula or a peritoneal dialysis (PD) catheter (e.g., Tenckhoff catheter), not a Denver shunt. * **Raised ICP (Intracranial Pressure):** This is managed using a **Ventriculoperitoneal (VP) shunt**, which moves CSF from the brain to the peritoneum. * **Raised IOP (Intraocular Pressure):** Glaucoma is managed with topical medications, laser trabeculoplasty, or surgical shunts like the Ahmed Glaucoma Valve, but not a Denver shunt. **Clinical Pearls for NEET-PG:** * **LeVeen vs. Denver:** Both are peritoneovenous shunts. The Denver shunt is preferred by some because its manual pump helps prevent clogging by fibrin. * **Complications:** The most serious complication of these shunts is **Disseminated Intravascular Coagulation (DIC)**, caused by the sudden infusion of ascitic clotting factors into the systemic circulation. Other risks include fluid overload and shunt infection. * **Current Status:** Due to high complication rates and the advent of **TIPS (Transjugular Intrahepatic Portosystemic Shunt)**, Denver shunts are now primarily reserved for malignant ascites where TIPS is not feasible.

Q: Sister Mary Joseph nodule suggests?

Intra-abdominal malignancy. **Explanation:** **Sister Mary Joseph nodule** refers to a palpable, firm, and often painful nodule at the umbilicus. It represents a **cutaneous metastasis** from an underlying **intra-abdominal or pelvic malignancy**. The correct answer is **B** because the umbilicus is a site of complex lymphatic and venous drainage, as well as a remnant of embryonic structures (like the urachus and vitelline duct). Malignant cells spread to this site via hematogenous routes, lymphatic spread, or direct extension along the falciform ligament. The most common primary site is the **Stomach** (in men) and the **Ovaries** (in women), followed by the pancreas and colon. **Why other options are incorrect:** * **A. Rheumatoid arthritis:** This is associated with subcutaneous nodules (Rheumatoid nodules) typically found over extensor surfaces or pressure points, not the umbilicus. * **C. Generalized lymphadenopathy:** While malignancy can cause lymphadenopathy (e.g., Virchow’s node), Sister Mary Joseph nodule is a specific cutaneous metastatic deposit, not a lymph node. * **D. Congenital defect:** Umbilical abnormalities like omphalocele or umbilical hernias are congenital, but a firm nodule in an adult is a classic sign of advanced malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Source:** Gastric adenocarcinoma is the most frequent primary source overall. * **Prognostic Significance:** Its presence usually indicates advanced, metastatic (Stage IV) disease and carries a poor prognosis. * **Historical Note:** Named after Sister Mary Joseph, the surgical assistant to Dr. William Mayo, who first noticed the correlation between the nodule and intra-abdominal cancer. * **Differential Diagnosis:** Must be distinguished from an umbilical hernia or a "Caput Medusae" (portal hypertension).

Q: Which of the following is NOT true about Prostate-Specific Antigen (PSA)?

Finasteride increases PSA levels.. **Explanation:** The correct answer is **C. Finasteride increases PSA levels.** This statement is false because Finasteride, a 5-alpha reductase inhibitor (5-ARI) used to treat BPH, actually **decreases** serum PSA levels by approximately **50%** after six months of treatment. It works by inhibiting the conversion of testosterone to dihydrotestosterone (DHT), leading to a reduction in prostatic volume and epithelial activity. **Analysis of Options:** * **Option A:** PSA is produced by both normal and hyperplastic prostatic epithelium. In **BPH**, the increased volume of prostatic tissue leads to an elevation in serum PSA levels. * **Option B:** PSA levels naturally **increase with age** due to the physiological enlargement of the prostate gland and increased basement membrane permeability. Age-specific reference ranges are often used to improve diagnostic accuracy. * **Option D:** **Metastatic prostate cancer** typically involves a high burden of malignant cells producing PSA, leading to significantly elevated serum levels, often exceeding 20–100 ng/mL. **High-Yield Clinical Pearls for NEET-PG:** * **The "Rule of Two":** When interpreting PSA in a patient on Finasteride or Dutasteride for >6 months, you must **multiply the measured PSA value by 2** to estimate the true baseline. * **PSA Density:** PSA value divided by prostate volume (measured via TRUS). A value **>0.15** is suspicious for malignancy. * **PSA Velocity:** An increase of **>0.75 ng/mL per year** is highly suggestive of cancer, even if the absolute value is within the normal range. * **Free-to-Total PSA Ratio:** A lower ratio (**<15-20%**) is associated with a higher risk of prostate cancer, whereas a higher ratio is seen in BPH.

Q: For the treatment of ectopic vesicles, which of the following bones is divided to reach the surgical site?

Iliac bone. **Explanation:** The question refers to the surgical management of **Exstrophy of the Bladder** (ectopic vesicae). The fundamental anatomical defect in this condition is a wide separation of the pubic symphysis, which leads to an outward rotation of the innominate bones and lateral displacement of the rectus abdominis muscles. **1. Why Iliac Bone is Correct:** To achieve a tension-free closure of the bladder, abdominal wall, and pelvic ring, a **bilateral iliac osteotomy** is performed. By dividing the iliac bones (usually posterior or transverse osteotomy), the surgeon can mobilize the pelvic halves medially. This allows the pubic bones to be brought together in the midline, facilitating the anatomical reconstruction of the bladder neck and the closure of the abdominal wall defect. **2. Why Other Options are Incorrect:** * **Pubic rami & Ischium bone:** While these are parts of the pelvic girdle, they are not the primary sites for osteotomy in exstrophy repair. Dividing these would not provide the necessary leverage or mobility required to rotate the pelvic wings inward effectively. * **Symphysis:** In ectopic vesicae, the symphysis is already widely separated (diastasis). The goal of the surgery is to *approximate* the symphysis, not to divide it further. **Clinical Pearls for NEET-PG:** * **Classic Triad of Exstrophy:** Epispadias, bifid clitoris/penis, and widely separated pubic symphysis. * **Radiological Sign:** The "Molar Tooth Sign" on imaging or a "widened pubic diastasis" on X-ray. * **Timing of Surgery:** Primary closure is ideally performed within the first 48–72 hours of life when the pelvis is still malleable (sometimes allowing closure without osteotomy). After 72 hours, iliac osteotomy becomes mandatory. * **Associated Finding:** Patients often have an "out-toeing" gait due to the external rotation of the acetabulum.

Q: Which dye is used in chromoendoscopy for the detection of cancer?

Methylene blue. **Explanation:** **Chromoendoscopy** is a clinical technique where dyes are applied topically during endoscopy to enhance tissue characterization, helping to differentiate between neoplastic (cancerous) and non-neoplastic lesions. **Why Methylene Blue is correct:** Methylene blue is a **vital stain** (absorptive stain) taken up by the cytoplasm of normal, mature cells of the gastrointestinal and urinary tracts. In the context of cancer detection, it is frequently used to identify **Barrett’s esophagus** (metaplasia) and early gastric or colonic cancers. In urology, it can be used to identify bladder mucosal changes. It highlights areas of abnormal cell turnover or loss of normal architecture, as cancerous cells often show different uptake patterns compared to healthy mucosa. **Analysis of Incorrect Options:** * **Gentian Violet:** Primarily used as a histological stain for bacteria (Gram stain) or as a topical antifungal/antiseptic; it is not standard for chromoendoscopy. * **Toluidine Blue:** While used as a topical agent to highlight oral cancers (dysplasia), it is less commonly used in systemic chromoendoscopy compared to Methylene blue or Indigo carmine. * **Hematoxylin and Eosin (H&E):** This is the standard stain used in **histopathology** laboratories for processed tissue biopsies under a microscope. It cannot be used in a living patient during an endoscopic procedure. **Clinical Pearls for NEET-PG:** * **Classification of Dyes:** * **Absorptive (Vital):** Methylene blue, Lugol’s iodine (used for squamous cell CA of the esophagus). * **Contrast (Non-vital):** Indigo carmine (highlights mucosal relief/topography). * **Reactive:** Congo red (detects acid-secreting areas). * **Narrow Band Imaging (NBI):** This is "optical chromoendoscopy" which uses specific wavelengths of light instead of chemical dyes to visualize sub-epithelial vascularity.

Question 1

A 42-year-old man presents with sudden onset, severe left-sided flank pain radiating into the groin. He experienced a similar episode years ago that resolved spontaneously. He denies fever, chills, nausea, vomiting, diarrhea, or dysuria. Physical examination reveals left flank and groin tenderness. Urinalysis shows microscopic hematuria without casts. Serum chemistry reveals: Sodium: 143 mEq/L, Potassium: 2.4 mEq/L, Bicarbonate: 17 mEq/L, Chloride: 115 mEq/L, Blood urea nitrogen: 12 mg/dL, Creatinine: 1.0 mg/dL, Glucose: 85 mg/dL. Which of the following acid-base disturbances is MOST likely present in this patient?

Accepted Answer

Metabolic acidosis

Answer

Normal acid-base status

Answer

Metabolic alkalosis

Answer

Respiratory acidosis

Question 2

Which of the following brain tumors is highly vascular in nature?

Accepted Answer

Glioblastoma

Answer

Meningiomas

Answer

CP angle epidermoid

Answer

Pituitary adenomas

Question 3

Thimble bladder is seen in all conditions except?

Accepted Answer

Benign Prostatic Hyperplasia (BPH)

Answer

Tuberculosis

Answer

Malignancy

Answer

Schistosomiasis

Question 4

Which structure is injured during the excision of a ranula?

Accepted Answer

Submandibular duct

Answer

Parotid duct

Answer

Facial artery

Answer

Lingual nerve

Question 5

Denver shunt is used in which condition?

Accepted Answer

Ascites

Answer

Dialysis

Answer

Raised ICP

Answer

Raised IOP

Question 6

Sister Mary Joseph nodule suggests?

Accepted Answer

Intra-abdominal malignancy

Answer

Rheumatoid arthritis

Answer

Generalized lymphadenopathy

Answer

Congenital defect

Question 7

Which of the following is NOT true about Prostate-Specific Antigen (PSA)?

Accepted Answer

Finasteride increases PSA levels.

Answer

PSA levels increase in Benign Prostatic Hyperplasia (BPH).

Answer

PSA levels increase with age.

Answer

Metastatic prostate cancer increases PSA levels.

Question 8

For the treatment of ectopic vesicles, which of the following bones is divided to reach the surgical site?

Accepted Answer

Iliac bone

Answer

Pubic rami

Answer

Ischium bone

Answer

Symphysis

Question 9

A 36-year-old man presents with right scrotal swelling that began shortly after moving furniture. He denies nausea, vomiting, change in bowel habits, abdominal pain, or urinary tract symptoms. On examination, an enlarged right hemi-scrotum is noted, with a mass originating at the level of the external inguinal ring. The mass is reducible through the external inguinal ring. When the mass is reduced and the patient performs a Valsalva maneuver, a protrusion is felt at the external inguinal ring. The testicle appears normal after reduction. Which of the following pathological processes might cause the patient's underlying condition to occur in an infant?

Accepted Answer

Patent processus vaginalis

Answer

Defect in the floor of the inguinal canal

Answer

Defect in the internal inguinal ring

Answer

Defect in the linea semilunaris

Question 10

Which dye is used in chromoendoscopy for the detection of cancer?

Accepted Answer

Methylene blue

Answer

Gentian violet

Answer

Toluidine blue

Answer

Hematoxylin and Eosin

Urology — MCQs

Urology — MCQs

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