Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 631: Which one of the following does not indicate a good prognosis in carcinoma of the penis?

A. Tumor size less than 2 cm (Correct Answer)
B. No regional lymph node metastasis
C. No invasion of subepithelial connective tissue
D. No distant metastases

Explanation: In Penile Carcinoma, the prognosis is primarily determined by the **pathological stage (TNM)** and the **histological grade**, rather than the absolute physical size of the primary tumor. ### **Why Option A is the Correct Answer** **Tumor size (< 2 cm)** is not a reliable prognostic indicator in penile cancer. A small tumor (e.g., 1.5 cm) that is high-grade (undifferentiated) or has invaded the corpus cavernosum (T2) or corpus spongiosum carries a much worse prognosis than a large, 4 cm superficial verrucous carcinoma. In the current AJCC TNM staging, "size" is not a criteria; instead, the **depth of invasion** and **nodal status** are the critical determinants of survival. ### **Explanation of Incorrect Options** * **B. No regional lymph node metastasis:** This is the **most important** prognostic factor. The presence and extent of inguinal lymph node involvement directly correlate with 5-year survival rates. Absence of nodal spread indicates an excellent prognosis. * **C. No invasion of subepithelial connective tissue:** This refers to **Stage Ta/Tis**. Tumors confined to the epithelium without invading the subepithelial connective tissue (lamina propria) have a negligible risk of metastasis and an excellent prognosis. * **D. No distant metastases:** Distant metastasis (M1) in penile cancer is rare but fatal. Its absence is a prerequisite for a favorable long-term outcome. ### **Clinical Pearls for NEET-PG** * **Most common histological type:** Squamous Cell Carcinoma (95%). * **Most important prognostic factor:** Status of inguinal lymph nodes. * **Sentinel Lymph Node:** The "Sentinel node of Cabanas" is located near the superficial epigastric vein. * **Staging Insight:** T1 is divided into **T1a** (no lymphovascular invasion, well-differentiated) and **T1b** (lymphovascular invasion or high grade). T1b has a significantly higher risk of nodal micrometastasis.

Question 632: Which of the following tumours are known to spontaneously regress?

A. Malignant melanoma (Correct Answer)
B. Neuroblastoma
C. Ewing's sarcoma
D. Wilm's tumour

Explanation: **Explanation:** The phenomenon of **spontaneous regression** refers to the partial or complete disappearance of a malignant tumor in the absence of specific treatment. This is primarily attributed to a robust **host immune response** (T-cell mediated cytotoxicity) against tumor antigens. **1. Why Malignant Melanoma is the Correct Answer:** Malignant melanoma is the classic example of a tumor that undergoes spontaneous regression (occurring in approximately 0.2–1% of cases). It is highly immunogenic. Clinically, this is often seen as areas of **depigmentation** or "white patches" within a pigmented lesion, representing the immune system destroying melanocytes. In some cases, a patient may present with metastatic melanoma in a lymph node with no identifiable primary site because the original skin lesion regressed completely. **2. Analysis of Other Options:** * **Neuroblastoma (Option B):** While Neuroblastoma is famous for spontaneous **involution or maturation** (Stage 4S), the question asks for the most classic association. In many standard surgical textbooks (like Bailey & Love), Melanoma is cited as the premier example of this phenomenon. * **Ewing’s Sarcoma (Option C):** This is a highly aggressive bone tumor. It does not undergo spontaneous regression and requires intensive multimodal therapy (chemotherapy, surgery, and radiation). * **Wilms’ Tumour (Option D):** Also known as nephroblastoma, it is the most common renal tumor in children. It does not regress spontaneously and carries a high risk of rapid growth if left untreated. **High-Yield Clinical Pearls for NEET-PG:** * **Top 4 tumors known for spontaneous regression:** 1. Malignant Melanoma (Most common) 2. Neuroblastoma (Specifically Stage 4S in infants) 3. Renal Cell Carcinoma (Regression of pulmonary metastases after nephrectomy) 4. Choriocarcinoma * **Key Concept:** Spontaneous regression is often linked to the **"Abscopal Effect,"** where localized treatment (like radiation) to one tumor site causes shrinkage of tumors at distant, untreated sites due to systemic immune activation.

Question 633: Which type of catheter is used for the removal of an embolus from blood vessels?

A. Drainage of the urinary bladder
B. Parenteral hyperalimentation
C. Removal of embolus from blood vessels (Correct Answer)
D. Ureteric catheterization

Explanation: The question refers to the **Fogarty Catheter**, which is a specialized balloon-tipped catheter designed specifically for arterial embolectomy. ### **Explanation of the Correct Answer** The **Fogarty catheter** (Option C) is the gold standard for removing an embolus or thrombus from the vascular system. It is inserted past the site of the clot; the balloon is then inflated and the catheter is withdrawn, effectively "dragging" the embolus out of the vessel. This procedure is a critical intervention in cases of acute limb ischemia. ### **Analysis of Incorrect Options** * **Option A (Drainage of the urinary bladder):** This is typically performed using a **Foley catheter** (indwelling) or a **Nelaton catheter** (straight drainage). While these also use balloons for retention, they are not designed for endovascular use. * **Option B (Parenteral hyperalimentation):** This requires central venous access, usually via a **Central Venous Catheter (CVC)** or a **PICC line**, to deliver high-osmolarity nutrient solutions directly into the superior vena cava. * **Option C (Ureteric catheterization):** This involves the use of **Double-J (DJ) stents** or simple ureteric catheters to bypass obstructions or provide a template for healing. ### **High-Yield Clinical Pearls for NEET-PG** * **Inventor:** Thomas J. Fogarty (1963). * **Mechanism:** It is a "blind" procedure usually done under local anesthesia. * **Size:** Measured in **French (F)**; common sizes range from 2F to 7F. * **Complications:** Intimal injury, vessel perforation, or distal embolization of fragments. * **Key Identification:** Look for a thin, flexible catheter with a small, high-pressure balloon at the tip in surgical instrument images.

Question 634: What percentage of cases with kidney injury require surgical exploration?

A. 20% (Correct Answer)
B. 90%
C. 50%
D. 70%

Explanation: ### Explanation The management of renal trauma has shifted significantly toward a **non-operative approach**, even for high-grade injuries. Currently, approximately **80% of renal injuries** are managed conservatively, while only **20% require surgical exploration**. **Why 20% is the Correct Answer:** Most renal injuries (Grade I-III) are minor contusions or superficial lacerations that heal with bed rest, hydration, and monitoring. Even many Grade IV and V injuries (major lacerations or vascular injuries) can be managed with angioembolization or stenting. Surgical exploration is reserved for specific indications: * **Hemodynamic instability** (the absolute indication). * Expanding or pulsatile retroperitoneal hematoma. * Grade V vascular pedicle avulsion. **Analysis of Incorrect Options:** * **B (90%) and D (70%):** These figures are historically inaccurate. In the past, surgical rates were higher due to a lack of advanced imaging (CT scans) and interventional radiology. Today, such high rates would indicate unnecessary nephrectomies. * **C (50%):** This overestimates the need for surgery. With modern conservative protocols, even half of all major renal traumas (Grade IV) can often avoid the operating room. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Contrast-Enhanced CT (CECT) is the investigation of choice for stable patients. * **Most Common Organ Injured in Blunt Trauma Abdomen:** Spleen (Renal is less common). * **Absolute Indication for Surgery:** Persistent hemodynamic instability despite resuscitation. * **AAST Grading:** Remember that Grade IV involves the collecting system or main renal artery/vein thrombosis, while Grade V is a shattered kidney or hilar avulsion.

Question 635: Carcinoma of the prostate most commonly arises from which zone?

A. Central zone
B. Peripheral zone (Correct Answer)
C. Transitional zone
D. Periurethral zone

Explanation: **Explanation:** The prostate gland is anatomically divided into distinct zones according to **McNeal’s classification**. Understanding these zones is crucial for diagnosing prostatic pathologies. **1. Why the Peripheral Zone (PZ) is correct:** Approximately **70–80% of prostatic adenocarcinomas** originate in the peripheral zone. This zone constitutes the bulk of the glandular tissue and is located posteriorly, surrounding the distal urethra. Because of its posterior location, tumors in this zone are easily palpable during a **Digital Rectal Examination (DRE)**, making DRE a vital screening tool. **2. Analysis of Incorrect Options:** * **Central Zone (CZ):** Only about 5–10% of cancers arise here. It surrounds the ejaculatory ducts. * **Transitional Zone (TZ):** This is the primary site for **Benign Prostatic Hyperplasia (BPH)**. While about 10–20% of prostate cancers can arise here, it is significantly less common than the peripheral zone. * **Periurethral Zone:** This area contains tiny glands involved in BPH but is rarely a primary site for malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type:** Adenocarcinoma. * **Screening:** PSA (Prostate-Specific Antigen) + DRE. * **Diagnosis:** Transrectal Ultrasound (TRUS) guided biopsy (standard is a 12-core biopsy). * **Metastasis:** Most commonly spreads to the **bone (osteoblastic lesions)** via the **Batson venous plexus** (vertebral venous plexus). * **Grading:** The **Gleason Scoring System** is used to determine prognosis based on architectural patterns.

Question 636: Endoscope washing with deionized water is associated with which organism?

A. Mycobacterium tuberculosis
B. Mycobacterium bovis
C. Mycobacterium chelonae (Correct Answer)
D. Mycobacterium ulcerans

Explanation: ### Explanation **Correct Answer: C. Mycobacterium chelonae** **1. Why Mycobacterium chelonae is correct:** *Mycobacterium chelonae* belongs to the group of **Rapidly Growing Mycobacteria (RGM)**. These organisms are ubiquitous in the environment and are notably resistant to standard chlorine levels found in tap water. In the context of urology and endoscopy, the use of **deionized water** (or inadequately filtered tap water) for rinsing endoscopes after disinfection is a classic source of contamination. *M. chelonae* can form robust biofilms within the channels of endoscopes and automated reprocessors, leading to post-procedural infections or "pseudo-outbreaks" (positive cultures without clinical disease). **2. Why the other options are incorrect:** * **A & B (M. tuberculosis & M. bovis):** These are members of the *M. tuberculosis* complex. They are slow-growing and typically transmitted via respiratory droplets (TB) or unpasteurized milk (*M. bovis*). They do not naturally inhabit water systems or deionizing units. * **D (M. ulcerans):** This organism is the causative agent of Buruli ulcer. While it is associated with aquatic environments (marshes/swamps), it is not a common contaminant of medical equipment or deionized water systems used in hospital sterilization. **3. High-Yield Clinical Pearls for NEET-PG:** * **Disinfection Gold Standard:** Glutaraldehyde (2%) is the most common high-level disinfectant for endoscopes, but RGM like *M. chelonae* and *M. fortuitum* show relative resistance if exposure time is inadequate. * **Sterilization vs. Disinfection:** Endoscopes are "semi-critical" items (contacting mucous membranes) and require high-level disinfection (HLD). * **Rinse Water:** To prevent contamination, endoscopes should be rinsed with **sterile water** or bacteria-filtered water, never plain deionized or tap water. * **Other RGM:** *Mycobacterium fortuitum* and *Mycobacterium abscessus* are also frequently implicated in post-surgical wound infections and contaminated medical devices.

Question 637: Which of the following refinements of serum PSA is used to determine the need for TRUS guided biopsy of the prostate, even when the level of serum PSA is still in the normal range?

A. Prostate-specific antigen density (PSAD)
B. PSA velocity (Correct Answer)
C. Free/Total PSA ratio
D. Complexed/Total PSA ratio

Explanation: **Explanation:** **PSA Velocity (PSAV)** refers to the rate of change in serum PSA levels over time. It is the most sensitive refinement for detecting prostate cancer in men whose absolute PSA levels are still within the "normal" range (typically <4 ng/mL). A rapid rise in PSA—specifically an increase of **>0.75 ng/mL per year**—is highly suggestive of malignancy and serves as an indication for a TRUS-guided biopsy, even if the total PSA value has not yet crossed the standard threshold. **Analysis of Incorrect Options:** * **PSA Density (PSAD):** This is the ratio of serum PSA to the volume of the prostate (measured by TRUS). It is primarily used to differentiate BPH from cancer in patients with "borderline" PSA levels (4–10 ng/mL). A value >0.15 is considered suspicious. * **Free/Total PSA Ratio:** Since prostate cancer produces more "bound" PSA, a lower percentage of free PSA (<15–20%) indicates a higher risk of cancer. Like PSAD, it is most useful in the 4–10 ng/mL "gray zone." * **Complexed/Total PSA Ratio:** Most PSA in the blood is complexed with alpha-1-antichymotrypsin. While useful, it does not supersede PSAV in identifying risk within the normal range. **High-Yield Clinical Pearls for NEET-PG:** * **Normal PSA:** <4 ng/mL. * **PSA Velocity Requirement:** To be accurate, at least 3 serial PSA measurements should be taken over a period of 18–24 months. * **Age-Specific PSA:** PSA levels naturally rise with age due to prostate volume increase (e.g., <2.5 for age 40–49; <6.5 for age 70–79). * **Most common site for Prostate Cancer:** Peripheral zone (70%). * **Standard Biopsy:** 12-core systematic TRUS-guided biopsy.

Question 638: Lord's and Jaboulay's operation is done for:

A. Rectal prolapse
B. Fistula in Ano
C. Inguinal hernia
D. Hydrocele (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Hydrocele**. Both Lord’s and Jaboulay’s procedures are surgical techniques used to treat a primary vaginal hydrocele by managing the redundant tunica vaginalis. * **Jaboulay’s Procedure (Eversion of Sac):** This is the most common surgery for large, thick-walled hydroceles. The sac is opened, and the redundant tunica vaginalis is folded back (everted) behind the testis and epididymis, then sutured. This allows the fluid-secreting surface to face the scrotal tissues, where fluid can be reabsorbed. * **Lord’s Procedure (Plication of Sac):** This is preferred for thin-walled hydroceles. Instead of eversion, the sac is gathered and bunched up using multiple "plication" sutures. This technique is associated with less postoperative hematoma compared to Jaboulay’s. **Why other options are incorrect:** * **Rectal Prolapse:** Treated via procedures like Wells (Rectopexy) or Thiersch wiring. * **Fistula in Ano:** Managed by Fistulectomy, Fistulotomy, or specialized techniques like LIFT and Seton placement. * **Inguinal Hernia:** Treated via Herniotomy (in children) or Hernioplasty (e.g., Lichtenstein tension-free repair). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Transillumination test (positive in hydrocele). * **Differential:** A hydrocele is "get-above-able" on palpation, whereas an inguinal hernia is not. * **Complications:** Post-operative scrotal hematoma is the most common complication of hydrocele surgery. * **Other techniques:** **Subtotal Excision** is used for very thick, calcified sacs.

Question 639: In which of the following conditions is acquired (secondary) megacolon seen?

A. Fissure in-ano
B. Complete absence of parasympathetic ganglion cells
C. Absence of sympathetic ganglion cells
D. Rectal malignancy (Correct Answer)

Explanation: **Explanation:** **Megacolon** refers to the permanent dilation and hypertrophy of the colon. It is classified into two types: **Congenital** (Hirschsprung disease) and **Acquired** (Secondary). **Why Rectal Malignancy is Correct:** Acquired megacolon occurs due to a mechanical obstruction or a functional disorder later in life. A **rectal malignancy** acts as a chronic mechanical obstruction. As the tumor narrows the lumen, the proximal colon undergoes compensatory hypertrophy and massive dilation to push fecal matter past the obstruction. Other causes of acquired megacolon include Chagas disease (destruction of plexuses), strictures, and psychogenic causes. **Analysis of Incorrect Options:** * **Option A (Fissure-in-ano):** While painful defecation can lead to voluntary stool withholding and constipation, it typically does not result in the massive pathological dilation characteristic of megacolon. * **Option B (Complete absence of parasympathetic ganglion cells):** This is the hallmark of **Hirschsprung Disease** (Congenital Megacolon). It is caused by the failure of neural crest cells to migrate, leading to an aganglionic segment. This is a *congenital* condition, not acquired. * **Option C (Absence of sympathetic ganglion cells):** This is physiologically incorrect. Megacolon is associated with the absence of the **Auerbach (myenteric) and Meissner (submucosal) parasympathetic plexuses**, not the sympathetic system. **High-Yield Clinical Pearls for NEET-PG:** * **Hirschsprung Disease:** Most commonly affects the **rectosigmoid** region. The "gold standard" for diagnosis is a **suction rectal biopsy** showing the absence of ganglion cells and increased acetylcholinesterase activity. * **Toxic Megacolon:** A life-threatening complication of Ulcerative Colitis or *C. difficile* infection; it is characterized by dilation >6 cm and systemic toxicity. * **Chagas Disease:** Caused by *Trypanosoma cruzi*, it is a common cause of acquired megacolon globally due to the destruction of the myenteric plexus.

Question 640: Early dumping syndrome consists of the following clinical features, except:

A. Abdominal and vasomotor symptoms found in about 5%-10% of patients following gastrectomy or vagotomy and drainage
B. The small bowel is filled with foodstuffs from the stomach, which have a high osmotic load
C. This leads to the sequestration of fluid from the circulation to the gastrointestinal tract
D. A fall in the packed cell volume is observed while the symptoms are present (Correct Answer)

Explanation: **Explanation:** **Early Dumping Syndrome** occurs 15–30 minutes after a meal due to the rapid emptying of hypertonic chyme into the small intestine, typically following gastric surgeries (gastrectomy, pyloroplasty). **Why Option D is the correct answer (The Exception):** The fundamental pathophysiology involves a massive **fluid shift** from the intravascular compartment into the intestinal lumen to dilute the high osmotic load. This results in **intravascular volume depletion (hypovolemia)**. Consequently, there is **hemoconcentration**, leading to a **rise in the packed cell volume (PCV/Hematocrit)**, not a fall. **Analysis of Incorrect Options:** * **Option A:** It is true that early dumping affects approximately 5%–10% of patients post-gastric surgery. It presents with both gastrointestinal (bloating, pain) and vasomotor (tachycardia, syncope) symptoms. * **Option B:** Correct. The rapid entry of undigested, hyperosmolar food into the proximal small bowel is the primary trigger. * **Option C:** Correct. The high osmotic pressure in the bowel lumen draws fluid from the circulation, causing bowel distension and systemic hypotension. **NEET-PG High-Yield Pearls:** * **Early vs. Late Dumping:** Early dumping (osmotic shift) occurs within 30 mins; Late dumping (reactive hypoglycemia due to insulin surge) occurs 1–3 hours post-prandially. * **Management:** Initial treatment is dietary modification (small, frequent, dry, low-carb meals). * **Medical Therapy:** **Octreotide** (somatostatin analogue) is the most effective drug for refractory cases. * **Surgical Fix:** If medical therapy fails, a **Roux-en-Y reconstruction** is often the preferred surgical intervention.

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