Urology — MCQs

Urology Indian Medical PG Practice Questions and MCQs

Question 261: In assessing lower urinary tract symptoms (LUTS) in men, which of the following statements is false?

A. Changing patient's symptoms according to the International Prostate Symptom Score (IPSS) is routinely used.
B. Flow rate measurement studies and pressure-flow urodynamic studies are done.
C. A thorough nervous system examination is mandatory.
D. Cystourethroscopy is a good guide as an indication for surgery. (Correct Answer)

Explanation: **Explanation:** The correct answer is **D**. In the evaluation of Lower Urinary Tract Symptoms (LUTS) and Benign Prostatic Hyperplasia (BPH), **cystourethroscopy is NOT routinely used to determine the need for surgery.** While it can identify bladder stones, diverticula, or urethral strictures, the visual appearance of the prostate (degree of trilobar enlargement) does not correlate well with the severity of symptoms or the degree of bladder outlet obstruction (BOO). The decision for surgery is primarily based on the severity of symptoms (IPSS), failure of medical therapy, or the presence of complications (e.g., refractory retention, hematuria, or renal failure). **Analysis of other options:** * **Option A:** The **IPSS (International Prostate Symptom Score)** is the gold standard for assessing symptom severity and monitoring treatment response. It consists of 7 symptom questions and 1 quality-of-life question. * **Option B:** **Uroflowmetry** (Qmax <10-15 mL/s) and **Pressure-flow studies** are essential objective tests. Pressure-flow studies are the "gold standard" for diagnosing bladder outlet obstruction and distinguishing it from detrusor underactivity. * **Option C:** A **nervous system examination** is mandatory to rule out neurogenic bladder (e.g., from Parkinson’s, stroke, or spinal cord injury), which can mimic BPH symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Initial Investigation:** Urinalysis (to rule out infection/hematuria). * **Most Important Physical Exam:** Digital Rectal Examination (DRE) to assess prostate size and rule out malignancy. * **Indications for Cystoscopy:** Only if hematuria, urethral stricture, or bladder cancer is suspected, or for surgical planning (to decide between TURP vs. Open Prostatectomy). * **Normal Qmax:** >15 mL/s. A Qmax <10 mL/s is highly suggestive of obstruction.

Question 262: Which condition is associated with pNET?

A. Zollinger Ellison syndrome (Correct Answer)
B. Intestinal metaplasia
C. Peutz Jeghers syndrome
D. Familial polyposis coli

Explanation: **Explanation:** **Zollinger-Ellison Syndrome (ZES)** is the correct answer because it is caused by a **gastrinoma**, which is a type of **pancreatic neuroendocrine tumor (pNET)**. Gastrinomas secrete excessive amounts of gastrin, leading to gastric acid hypersecretion and refractory peptic ulcer disease. Approximately 25% of ZES cases occur as part of **Multiple Endocrine Neoplasia type 1 (MEN1)** syndrome, which is characterized by the triad of Parathyroid hyperplasia, Pituitary adenomas, and Pancreatic islet cell tumors (pNETs). **Analysis of Incorrect Options:** * **Intestinal Metaplasia:** This is a precancerous transformation of the gastric or esophageal mucosa (e.g., Barrett’s esophagus) usually due to chronic irritation (H. pylori or GERD). It is associated with adenocarcinoma, not pNETs. * **Peutz-Jeghers Syndrome:** An autosomal dominant disorder characterized by hamartomatous polyps in the GI tract and mucocutaneous hyperpigmentation. While it increases the risk of various cancers (breast, pancreas, colon), it is not primarily defined by pNETs. * **Familial Polyposis Coli (FAP):** Caused by a mutation in the APC gene, this condition leads to hundreds of adenomatous colorectal polyps. It is strongly associated with colorectal carcinoma and extracolonic manifestations like desmoid tumors and osteomas (Gardner syndrome), but not pNETs. **High-Yield Clinical Pearls for NEET-PG:** * **Most common pNET in MEN1:** Insulinoma (overall), but Gastrinoma is the most common *symptomatic* malignant pNET. * **Gastrinoma Triangle (Passaro’s Triangle):** Boundaries are the junction of the cystic and common bile duct, the junction of the 2nd and 3rd parts of the duodenum, and the neck of the pancreas. * **Diagnostic Test for ZES:** Elevated fasting serum gastrin levels (>1000 pg/mL) and a positive **Secretin Stimulation Test** (paradoxical rise in gastrin).

Question 263: In children, persistent priapism may result due to which of the following conditions?

A. Thrombosis of the venous plexus
B. Leukemia (Correct Answer)
C. Wilms' tumor
D. Trauma

Explanation: **Explanation:** **Priapism** is defined as a persistent, usually painful, penile erection lasting more than 4 hours, unrelated to sexual stimulation. In the pediatric population, the etiology differs significantly from adults. **Why Leukemia is the Correct Answer:** Leukemia (specifically Chronic Myeloid Leukemia or Acute Lymphoblastic Leukemia) is the **most common non-sickle cell cause** of priapism in children. The underlying mechanism is **hyperviscosity** and **leukostasis**. A massive increase in the white blood cell count leads to the sludging of cells within the corpora cavernosa and the dorsal venous complex, obstructing outflow and resulting in an ischemic (low-flow) priapism. **Analysis of Incorrect Options:** * **A. Thrombosis of the venous plexus:** While venous obstruction is the end-result of ischemic priapism, primary idiopathic thrombosis is rare in children and usually secondary to an underlying hematological malignancy or sickle cell disease. * **C. Wilms' tumor:** This is the most common renal tumor in children, but it typically presents with an abdominal mass and hematuria. It does not cause priapism. * **D. Trauma:** Perineal or penile trauma usually causes **non-ischemic (high-flow) priapism** due to the formation of an arterial-lacunar fistula. While possible, it is less common as a systemic "condition" compared to the classic association with leukemia in pediatric exams. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause overall in children:** Sickle Cell Disease (approx. 65%). * **Most common malignancy-related cause:** Leukemia. * **Initial Investigation:** A Complete Blood Count (CBC) is mandatory in any child presenting with priapism to rule out leukemia or infection. * **Management:** Ischemic priapism is a surgical emergency requiring aspiration and irrigation; high-flow (traumatic) priapism is often managed conservatively.

Question 264: What is a predisposing factor for testicular germ cell tumors?

A. Cryptorchidism
B. Testicular feminization syndrome
C. Klinefelter's syndrome
D. All of the above (Correct Answer)

Explanation: **Explanation:** Testicular Germ Cell Tumors (GCTs) arise from germ cell neoplasia in situ (GCNIS). The development of these tumors is strongly linked to **Testicular Dysgenesis Syndrome**, where abnormal testicular development increases malignancy risk. * **Cryptorchidism (Undescended Testis):** This is the most significant risk factor. The risk of GCT is increased 4 to 10 times compared to the general population. Notably, the risk remains elevated even after orchiopexy, and the contralateral (normally descended) testis also carries a slightly higher risk. * **Testicular Feminization Syndrome (Complete Androgen Insensitivity Syndrome):** Individuals with a 46,XY karyotype and female phenotype have undescended testes (often intra-abdominal). There is a significant risk of developing **gonadoblastomas** or seminomas, necessitating prophylactic gonadectomy after puberty. * **Klinefelter’s Syndrome (47,XXY):** While primarily associated with primary testicular failure and infertility, patients have a significantly higher incidence of **extragonadal germ cell tumors**, particularly in the mediastinum. **Clinical Pearls for NEET-PG:** 1. **Most common GCT:** Seminoma (overall), but Yolk Sac Tumor is most common in children. 2. **Orchiopexy Timing:** Performing orchiopexy before puberty (ideally before age 1) reduces but does not eliminate the risk of malignancy; however, it makes the testis accessible for clinical examination. 3. **Genetic Marker:** Isochromosome **12p** [i(12p)] is found in almost all GCTs. 4. **Tumor Markers:** LDH (bulk), AFP (Yolk sac/Teratoma), and hCG (Choriocarcinoma/Seminoma). *Note: AFP is never elevated in pure seminoma.*

Question 265: McNeal's peripheral zone in the prostate gland is the common site for which condition?

A. Benign prostatic hyperplasia
B. Prostate cancer (Correct Answer)
C. Prostatitis
D. Prostatic calculi

Explanation: ### Explanation The prostate gland is anatomically divided into distinct zones according to **McNeal’s Zonal Anatomy**. Understanding these zones is crucial for diagnosing prostatic pathologies. **1. Why Prostate Cancer is Correct:** The **Peripheral Zone (PZ)** constitutes approximately 70% of the glandular prostate. It is the site of origin for **70–80% of prostate adenocarcinomas**. Because the PZ is located posteriorly and surrounds the distal urethra, tumors here are easily palpable during a **Digital Rectal Examination (DRE)** but often remain asymptomatic until late stages as they do not immediately compress the urethra. **2. Why Other Options are Incorrect:** * **Benign Prostatic Hyperplasia (BPH):** This condition primarily originates in the **Transition Zone (TZ)**, which surrounds the proximal urethra. Growth in this zone leads to early obstructive urinary symptoms. * **Prostatitis:** While inflammation can occur in the peripheral zone, it is a clinical diagnosis of the entire gland rather than a zone-specific surgical landmark. * **Prostatic Calculi:** These are usually found within the ducts of the prostate, often at the interface between the transition and peripheral zones (the "surgical capsule"), but they are not the primary pathology associated with McNeal’s description of the PZ. **3. Clinical Pearls for NEET-PG:** * **Transition Zone:** Site for BPH (think: "T" for Transition and "T" for Two-lobed BPH). * **Peripheral Zone:** Site for Cancer and most cases of chronic prostatitis. * **Central Zone:** Surrounds the ejaculatory ducts; rarely the site of pathology (only 1-5% of cancers). * **Anterior Fibromuscular Stroma:** Contains no glandular tissue; therefore, it does not develop BPH or cancer. * **Imaging:** Multiparametric MRI (mpMRI) is the gold standard for visualizing lesions in the Peripheral Zone.

Question 266: In Benign Prostatic Hyperplasia (BPH), which lobe is most commonly involved?

A. Lateral lobe
B. Posterior lobe
C. Median lobe (Correct Answer)
D. Anterior lobe

Explanation: **Explanation:** In Benign Prostatic Hyperplasia (BPH), the **Median lobe** (middle lobe) is the most commonly involved and clinically significant lobe. Pathologically, BPH originates in the **Transition Zone** (McNeal’s classification), which corresponds anatomically to the periurethral region and the median lobe. As this lobe enlarges, it projects into the bladder floor, often acting as a "ball-valve" mechanism that obstructs the internal urethral orifice, leading to significant Lower Urinary Tract Symptoms (LUTS). **Analysis of Options:** * **Median Lobe (Correct):** This is the primary site of adenomatous growth in BPH. Its enlargement is responsible for the classic "middle lobe projection" seen on cystoscopy or ultrasound. * **Lateral Lobes:** These are also frequently involved in BPH and contribute to urethral compression; however, the median lobe is traditionally cited as the most characteristic site of hyperplasia leading to obstruction. * **Posterior Lobe:** This lobe corresponds to the **Peripheral Zone**. This is the most common site for **Prostate Cancer**, not BPH. It is easily accessible via Digital Rectal Examination (DRE). * **Anterior Lobe:** This is largely fibromuscular stroma and contains very little glandular tissue; it is rarely involved in pathological processes like BPH or carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Zonal Anatomy:** BPH occurs in the **Transition Zone**, while Prostate Cancer occurs in the **Peripheral Zone**. * **DRE Findings:** In BPH, the prostate feels smooth, rubbery, and the median sulcus may be obliterated. In Carcinoma, it feels hard and nodular. * **Surgical Landmark:** During TURP (Gold Standard treatment), the **verumontanum** is the key landmark used to avoid damaging the external sphincter.

Question 267: Smegma is secreted by which gland?

A. Tyson gland (Correct Answer)
B. Brenner gland
C. Cowper's gland
D. Bartholin's gland

Explanation: **Explanation:** **Tyson’s glands** (also known as preputial glands) are modified sebaceous glands located around the corona of the glans penis and the inner surface of the prepuce (foreskin). They secrete a waxy, white substance known as **smegma**. Smegma serves as a lubricant during intercourse but can become a nidus for infection (balanoposthitis) or a chronic irritant if hygiene is poor. Chronic accumulation of smegma is considered a risk factor for the development of squamous cell carcinoma of the penis. **Analysis of Incorrect Options:** * **Brenner gland:** This is not a secretory gland but refers to a **Brenner tumor**, a rare, usually benign surface epithelial-stromal tumor of the ovary characterized by "coffee bean" nuclei. * **Cowper’s gland:** Also known as the bulbourethral gland, these are located in the deep perineal pouch. They secrete **pre-ejaculatory fluid** (clear, alkaline mucus) into the urethra to neutralize residual acidity from urine. * **Bartholin’s gland:** These are the female homologues of Cowper’s glands. Located in the posterior third of the labia majora, they secrete mucus to lubricate the vaginal opening. **Clinical Pearls for NEET-PG:** * **Smegma and Cancer:** Smegma itself is not a direct carcinogen, but its role in chronic inflammation is a major reason why **circumcision** (which prevents smegma accumulation) is protective against penile cancer. * **Pearly Penile Papules:** These are often confused with Tyson's glands; however, papules are anatomical variants (angiofibromas) found on the corona, whereas Tyson's glands are the functional secretory units. * **Histology:** Tyson's glands are **holocrine** sebaceous glands.

Question 268: A newborn presents with discharge of urine from the umbilicus for 3 days. What is the most likely diagnosis?

A. Meckel's diverticulum
B. Mesenteric cyst
C. Urachal fistula (Correct Answer)
D. Omphalocele

Explanation: **Explanation:** The clinical presentation of urine discharging from the umbilicus in a newborn is a classic sign of a **Urachal Fistula**. **1. Why Urachal Fistula is correct:** The urachus is an embryological remnant of the **allantois**, which connects the fetal bladder to the umbilicus. Normally, this structure obliterates after birth to become the **median umbilical ligament**. If the entire lumen remains patent (fails to close), a direct communication persists between the bladder and the umbilicus, leading to the continuous or intermittent leakage of urine from the navel. **2. Why other options are incorrect:** * **Meckel’s Diverticulum:** This is a remnant of the **vitellointestinal (omphalomesenteric) duct**. While a patent vitellointestinal duct can cause discharge at the umbilicus, the discharge would be **fecal matter or mucus**, not urine. * **Mesenteric Cyst:** These are fluid-filled cysts within the mesentery of the bowel. They typically present as an asymptomatic abdominal mass or with intestinal obstruction, not with umbilical discharge. * **Omphalocele:** This is a midline abdominal wall defect where abdominal viscera herniate through the umbilical ring, covered by a peritoneal sac. It is a structural defect of the wall, not a fistulous communication. **Clinical Pearls for NEET-PG:** * **Urachal Anomalies Hierarchy:** 1. **Urachal Cyst:** Most common; fluid collection in the mid-segment (non-communicating). 2. **Urachal Fistula:** Communication between bladder and umbilicus (urine leak). 3. **Urachal Sinus:** Blind-ended tract opening at the umbilicus. 4. **Vesicourachal Diverticulum:** Outpouching of the bladder apex. * **Diagnosis:** Initial investigation is usually Ultrasound; Gold standard is **Voiding Cystourethrogram (VCUG)** or Sinogram. * **Complication:** If left untreated in adults, the most common malignancy associated with urachal remnants is **Adenocarcinoma**.

Question 269: What characteristic of struvite (ammonium magnesium phosphate) stones makes antibiotics ineffective during treatment?

A. Presence of resistant bacteria
B. Poor excretion of antibiotics
C. Ineffectiveness of common antibiotics
D. Inaccessibility of bacteria to antibiotics (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Inaccessibility of bacteria to antibiotics** Struvite stones (Magnesium Ammonium Phosphate) are also known as **"infection stones"** because they form in the presence of urea-splitting organisms like *Proteus*, *Klebsiella*, and *Pseudomonas*. These bacteria produce the enzyme **urease**, which hydrolyzes urea into ammonia, raising urinary pH (>7.2). The core reason antibiotics fail is that the bacteria become **sequestered within the interstices of the stone matrix**. The stone acts as a physical nidus where bacteria are protected from both the host’s immune system and systemic antibiotics. Unless the stone is completely surgically removed, these "trapped" bacteria will continue to cause recurrent urinary tract infections (UTIs) and promote further stone growth. **Analysis of Incorrect Options:** * **A & C:** While antibiotic resistance can occur, it is not the primary reason for treatment failure. Even if the bacteria are sensitive to the antibiotic in a lab culture, the drug cannot penetrate the mineralized stone architecture to reach the bacteria at the core. * **B:** Most antibiotics used for UTIs (like Fluoroquinolones or Aminoglycosides) have excellent renal excretion and high urinary concentrations; the issue is the physical barrier of the stone, not the excretion level. **High-Yield Facts for NEET-PG:** * **Composition:** Magnesium Ammonium Phosphate and Calcium Carbonate Apatite. * **Morphology:** They typically form **Staghorn Calculi**, filling the renal pelvis and calyces. * **Radiology:** They are **radio-opaque** (though less dense than calcium oxalate). * **Pathogenesis:** High urinary pH (alkaline urine) is essential for precipitation. * **Treatment Gold Standard:** **PCNL (Percutaneous Nephrolithotomy)** to ensure complete clearance of all stone fragments ("sterilization of the collecting system").

Question 270: A patient presents with hematuria for many days. Investigations reveal renal calculi, calcifications in the wall of the urinary bladder, and a small contracted bladder. What is the most probable cause?

A. Schistosomiasis (Correct Answer)
B. Amyloidosis
C. Tuberculosis
D. Carcinoma of the urinary bladder

Explanation: ### Explanation The correct answer is **Schistosomiasis** (specifically *Schistosoma haematobium*). **Why Schistosomiasis is correct:** The triad of **hematuria, bladder wall calcification, and a small contracted bladder** is classic for chronic urinary schistosomiasis. The parasite eggs are deposited in the bladder wall, leading to a granulomatous reaction and intense fibrosis. * **Calcification:** The characteristic "fetal head" or "eggshell" calcification seen on X-ray represents the calcified eggs within the bladder wall. * **Contracted Bladder:** Chronic fibrosis leads to a loss of bladder compliance and reduced capacity (thimble bladder). * **Renal Calculi:** Stasis and secondary infections due to ureteric strictures often lead to stone formation. **Why the other options are incorrect:** * **Tuberculosis (TB):** While TB causes a "thimble bladder" and hematuria, **bladder wall calcification is rare** in TB. In TB, calcification is more common in the renal parenchyma (putty kidney). * **Amyloidosis:** This can cause hematuria and bladder thickening, but it does not typically present with the specific pattern of wall calcification and stone formation described. * **Carcinoma of the Urinary Bladder:** While Schistosomiasis is a risk factor for **Squamous Cell Carcinoma**, the primary malignancy itself presents as a mass lesion rather than diffuse wall calcification and a contracted bladder. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of calcification:** Terminal ureter and bladder wall. * **Pathognomonic sign:** "Eggshell" calcification of the bladder. * **Malignancy Risk:** Chronic Schistosomiasis is strongly associated with **Squamous Cell Carcinoma** (SCC) of the bladder, unlike the more common Transitional Cell Carcinoma (TCC). * **Drug of Choice:** Praziquantel.

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Hematuria Evaluation

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Urinary Calculi

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Benign Prostatic Hyperplasia

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Bladder Cancer

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Renal Cell Carcinoma

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Testicular Tumors

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Urinary Incontinence

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Urology — MCQs

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