Urological Anatomy — MCQs
Stab wounds of the kidneys involve other abdominal organs in a high percentage of cases. Of the organs listed, which one is least likely to be damaged in this patient?
Which of the following structures is separated from the left kidney by a peritoneal layer?
Which zone of the prostate is primarily involved in Benign Prostatic Hyperplasia (BPH)?
Organ which is commonly involved in retroperitoneal fibrosis is
A person after a pelvic fracture, could not pass urine. On examination bladder is not palpable. What is the probable diagnosis?
A person could not pass urine after a fall shown below. On examination vitals are stable but bladder is palpable. What is the probable diagnosis? (NEET Pattern 2018)
What is the most common site for extramammary Paget's disease?
Regarding ectopia vesicae, which of the following is true EXCEPT?
What is the first-line treatment for overactive bladder?
Subcapsular orchiectomy is done for cancer of which organ?
Urological Anatomy Indian Medical PG Practice Questions and MCQs
Question 1: Stab wounds of the kidneys involve other abdominal organs in a high percentage of cases. Of the organs listed, which one is least likely to be damaged in this patient?
- A. Spleen
- B. Stomach (Correct Answer)
- C. Inferior vena cava
- D. Left adrenal gland
Explanation: ***Stomach*** - The **stomach** is located in the **intraperitoneal space**, relatively anteriorly and centrally in the abdomen, while the kidneys are **retroperitoneal** and posteriorly positioned. - Most renal stab wounds occur from a **posterior or posterolateral approach**, making the anteriorly located stomach the **least likely** organ to be injured in conjunction with kidney trauma. - Its high mobility and gas content also offer some degree of protection by allowing it to shift with impact or absorb some of the force without penetrating injury. *Spleen* - The **spleen** is located in the left upper quadrant, in close anatomical proximity to the left kidney, making it highly susceptible to injury in cases of left renal stab wounds. - Its delicate, vascular nature makes it prone to significant bleeding even from minor trauma. *Inferior vena cava* - The **inferior vena cava (IVC)** lies in the retroperitoneum, anterior to the spine and medial to the kidneys, making it vulnerable to deep penetrating wounds that reach the posterior abdominal cavity. - Injury to the IVC can lead to massive hemorrhage and is a life-threatening complication. *Left adrenal gland* - The **left adrenal gland** is located superior and slightly medial to the left kidney, directly in the retroperitoneal space. - A stab wound to the left kidney has a high probability of also involving the closely associated left adrenal gland due to their anatomical proximity.
Question 2: Which of the following structures is separated from the left kidney by a peritoneal layer?
- A. Pancreas
- B. Jejunum (Correct Answer)
- C. Splenic flexure
- D. Splenic vessels
Explanation: ***Jejunum*** - The **jejunum**, being part of the intraperitoneal small intestine, is separated from the left kidney by a layer of **peritoneum** as it lies anterior to the kidney. - While the left kidney is retroperitoneal, the jejunum is intraperitoneal and separated by the **peritoneum** that lines the posterior abdominal wall. - This is the **most consistent and complete peritoneal separation** among the options. *Pancreas* - The **pancreas** (tail and body) lies anterior to the left kidney and is **retroperitoneal** [1]. - It is not separated from the left kidney by a peritoneal layer; instead, it is situated in the **anterior pararenal space** along with the kidney [1]. - Only the anterior surface of the pancreas is covered by peritoneum. *Splenic flexure* - While the **splenic flexure** is intraperitoneal and technically has peritoneum between it and the kidney, it often has **direct contact** with the kidney's lower pole via peritoneal reflections [2]. - The **phrenicocolic ligament** creates a shelf-like structure that can bring the splenic flexure into close proximity with the kidney. - The peritoneal separation is **less consistent** compared to the jejunum, making it a less ideal answer. *Splenic vessels* - The **splenic vessels** (artery and vein) run along the superior border of the pancreas, anterior to the left kidney, within the **retroperitoneal space** [1]. - These vessels are located in the **anterior pararenal space** and are not separated from the kidney by peritoneum [1].
Question 3: Which zone of the prostate is primarily involved in Benign Prostatic Hyperplasia (BPH)?
- A. Central zone
- B. Peripheral zone
- C. Transitional zone (Correct Answer)
- D. Prostate capsule
Explanation: ***Transitional zone*** - The **transitional zone** surrounds the urethra and is the primary site of origin and enlargement in **Benign Prostatic Hyperplasia (BPH)**. - Its hypertrophy leads to compression of the urethra, causing **lower urinary tract symptoms (LUTS)**. *Central zone* - The **central zone** surrounds the ejaculatory ducts and is less commonly involved in BPH. - It is more frequently associated with the development of **prostate carcinoma**. *Peripheral zone* - The **peripheral zone** is the largest zone of the prostate and is where the majority of prostate cancers originate. - While it can be affected by BPH, it is not the primary zone for hypertrophy. *Prostate capsule* - The **prostate capsule** is the outer fibrous layer that encloses the prostate gland. - It does not undergo hyperplasia in BPH; rather, it encases the enlarging gland.
Question 4: Organ which is commonly involved in retroperitoneal fibrosis is
- A. Ureter (Correct Answer)
- B. Kidneys
- C. Colon
- D. Duodenum
Explanation: ***Ureter*** - Retroperitoneal fibrosis is characterized by the proliferation of **fibrous tissue in the retroperitoneum**, which commonly encases the ureters. - This encasement can lead to **ureteral obstruction**, causing hydronephrosis and potential renal impairment. *Colon* - While the colon is located in the retroperitoneum for some segments (ascending, descending), it is **less commonly entrapped** and obstructed by retroperitoneal fibrosis compared to the ureters. - **Bowel obstruction** is not a primary or common clinical manifestation of retroperitoneal fibrosis. *Duodenum* - The duodenum is primarily located in the **upper retroperitoneum** but is generally less affected by the fibrotic process characteristic of retroperitoneal fibrosis. - **Obstructive symptoms related to the duodenum** are rare in this condition. *Kidneys* - The kidneys are retroperitoneal organs, but the fibrosis typically involves the **perirenal fat and surrounding structures**, not the kidney parenchyma itself. - Renal dysfunction in retroperitoneal fibrosis is usually a **secondary complication of ureteral obstruction**, not direct renal involvement.
Question 5: A person after a pelvic fracture, could not pass urine. On examination bladder is not palpable. What is the probable diagnosis?
- A. Extraperitoneal rupture of bladder (Correct Answer)
- B. Intraperitoneal rupture of bladder
- C. Rectourethral injury
- D. Posterior urethra rupture with retention of urine
Explanation: ***Extraperitoneal rupture of bladder*** - This typically occurs with **pelvic fractures**, especially pubic rami fractures, as the bony fragments can lacerate the bladder wall outside the peritoneum. - The inability to pass urine and a **non-palpable bladder** suggest that urine has escaped into the surrounding tissues, but not into the peritoneal cavity, and is not distending the bladder. *Intraperitoneal rupture of bladder* - Usually results from a **direct blow to a full bladder**, rather than a pelvic fracture, causing urine to spill into the peritoneal cavity. - While there would be an inability to pass urine, the bladder would likely be **distended and palpable** initially, or there would be signs of peritonitis. *Rectourethral injury* - This involves a tear between the rectum and the urethra, often associated with severe pelvic trauma. - While it causes an inability to void, the primary concern would be **fecal leakage into the urethra** or urinary leakage into the rectum, not necessarily a non-palpable bladder due to rupture into surrounding tissues. *Posterior urethra rupture with retention of urine* - A rupture of the posterior urethra, common with pelvic fractures, would indeed cause **retention of urine** and an inability to void. - However, in this scenario, the bladder would be **distended and palpable** above the symphysis pubis due to the retained urine, which contradicts the "non-palpable bladder" finding.
Question 6: A person could not pass urine after a fall shown below. On examination vitals are stable but bladder is palpable. What is the probable diagnosis? (NEET Pattern 2018)
- A. Anterior urethra rupture
- B. Posterior urethra rupture (Correct Answer)
- C. Penile avulsion
- D. Recto-urethral injury
Explanation: ***Posterior urethra rupture*** - The mechanism of injury, a **fall causing blunt perineal trauma** (as depicted by the man falling into a manhole), is a classic cause of posterior urethral injury, often associated with **pelvic fractures**. - The inability to pass urine with a **palpable distended bladder** indicates urinary retention due to complete urethral disruption, preventing urine flow from the bladder. - Classical triad: inability to void, blood at urethral meatus, and palpable bladder. *Anterior urethra rupture* - This typically results from a "straddle injury" (e.g., falling astride a beam or bike bar), which is different from the fall shown. - Anterior urethral injuries often manifest with **perineal extravasation of urine and blood (butterfly hematoma)**, and the bladder might still be palpable if retention occurs. *Penile avulsion* - This is a severe injury involving the **tearing away of penile skin or the entire penis**, which is not immediately suggested by the described symptoms of inability to urinate. - It would present with **obvious external hemorrhage** and tissue loss, not just urinary retention. *Recto-urethral injury* - This involves damage to both the **rectum and urethra**, usually from penetrating trauma or severe crush injuries. - While it could cause dysuria or inability to urinate, it would also likely present with **rectal bleeding or a palpable rectal injury**, which is not mentioned in the clinical scenario.
Question 7: What is the most common site for extramammary Paget's disease?
- A. Vulva (Correct Answer)
- B. Vagina
- C. Penis
- D. Anus
Explanation: **Explanation:** **Extramammary Paget’s Disease (EMPD)** is a rare intraepithelial adenocarcinoma that arises in skin areas rich in apocrine sweat glands. **Why Vulva is Correct:** The **vulva** is the most common site for EMPD, accounting for approximately **65% of all cases**. It typically presents in postmenopausal Caucasian women as a well-demarcated, erythematous, "eczematous-looking" plaque that may be itchy or burning. Histologically, it is characterized by the presence of **Paget cells** (large cells with clear, mucinous cytoplasm) within the epidermis. Unlike mammary Paget’s disease, which is almost always associated with an underlying breast malignancy, EMPD is associated with an underlying internal malignancy (like urogenital or colorectal cancer) in only about 20–30% of cases. **Why Other Options are Incorrect:** * **Vagina:** Primary Paget’s disease of the vagina is extremely rare; it usually occurs as a secondary extension from vulvar disease. * **Penis/Scrotum:** While the male genitalia are the second most common site for EMPD, they are significantly less frequently involved than the vulva. * **Anus:** Perianal Paget’s disease is the third most common site. It is clinically significant because it has a much higher association with underlying visceral (colorectal) malignancy compared to vulvar EMPD. **High-Yield Clinical Pearls for NEET-PG:** * **Staining:** Paget cells are **PAS positive**, **Alcian blue positive**, and **Mucicarmine positive** (indicating mucin production). * **Immunohistochemistry (IHC):** Typically **CK7 positive** and **CEA positive**. * **Differential Diagnosis:** Often misdiagnosed as chronic eczema, psoriasis, or fungal infection due to its "strawberries and cream" appearance. * **Management:** Wide local excision is the treatment of choice, though recurrence rates are high due to multifocal "skip" lesions.
Question 8: Regarding ectopia vesicae, which of the following is true EXCEPT?
- A. Carcinoma of the bladder may occur.
- B. There is a ventral curvature of the penis. (Correct Answer)
- C. There is incontinence of urine.
- D. There is visible uretero-vesical efflux.
Explanation: **Explanation** Ectopia vesicae (Bladder Exstrophy) is a complex congenital malformation resulting from a failure of the infra-umbilical anterior abdominal wall and bladder neck to fuse. **Why Option B is the correct answer (The Exception):** In ectopia vesicae, the penis is typically short and broad with a **dorsal curvature** (chordee), not a ventral one. This is because the urethral groove is open on the dorsal surface (Epispadias), and the corpora cavernosa are separated and shortened, pulling the penis upward toward the abdominal wall. Ventral curvature is characteristic of Hypospadias, not Exstrophy-Epispadias complex. **Analysis of other options:** * **Option A (True):** Chronic irritation and metaplasia of the exposed bladder mucosa significantly increase the risk of malignancy, most commonly **Adenocarcinoma** (due to glandular metaplasia), unlike the usual transitional cell carcinoma. * **Option C (True):** Since the bladder neck and sphincteric mechanisms are malformed and open, there is no reservoir function, leading to continuous **total incontinence**. * **Option D (True):** Because the posterior bladder wall (trigone) is exposed to the exterior, the ureteric orifices are visible, and one can directly observe the intermittent **efflux of urine** from them. **High-Yield Clinical Pearls for NEET-PG:** * **Associated skeletal finding:** Widening of the symphysis pubis (diastasis). * **Umbilicus:** Positioned lower than normal. * **Management:** Primary closure is ideally performed within 48–72 hours of birth. * **Most common malignancy:** Adenocarcinoma of the bladder. * **Key distinction:** Epispadias is always present in bladder exstrophy.
Question 9: What is the first-line treatment for overactive bladder?
- A. Antimuscarinic drug
- B. Behavioural therapy (Correct Answer)
- C. Cholinergic drug
- D. Botulinum toxin type A
Explanation: **Explanation:** **Overactive Bladder (OAB)** is a clinical syndrome characterized by urinary urgency, usually accompanied by frequency and nocturia, with or without urgency urinary incontinence. **Why Behavioural Therapy is Correct:** According to the American Urological Association (AUA) and European Association of Urology (EAU) guidelines, **Behavioural Therapy is the first-line treatment** for OAB. It is non-invasive, has no systemic side effects, and is highly effective. It includes: * **Bladder training:** Scheduled voiding to increase bladder capacity. * **Pelvic floor muscle training (Kegel exercises):** To inhibit detrusor contractions. * **Lifestyle modifications:** Fluid management, caffeine reduction, and weight loss. **Analysis of Incorrect Options:** * **A. Antimuscarinic drugs (e.g., Oxybutynin, Tolterodine):** These are **second-line** treatments. They work by blocking M3 receptors on the detrusor muscle but are often limited by side effects like dry mouth, constipation, and blurred vision. * **C. Cholinergic drugs:** These (e.g., Bethanechol) stimulate bladder contraction and are used in urinary retention/hypotonic bladder, not OAB. OAB requires *anti*-cholinergics. * **D. Botulinum toxin type A:** This is a **third-line** treatment. It is reserved for patients refractory to behavioural and pharmacological therapies and is administered via intra-detrusor injection. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Urodynamic study (shows detrusor overactivity). * **Mirabegron:** A $\beta_3$-adrenoceptor agonist, used as a second-line alternative to antimuscarinics (preferred in elderly to avoid cognitive side effects). * **Surgical Management:** Augmentation cystoplasty is the last resort for refractory cases.
Question 10: Subcapsular orchiectomy is done for cancer of which organ?
- A. Testes
- B. Prostate (Correct Answer)
- C. Penis
- D. Urethra
Explanation: **Explanation:** **Subcapsular orchiectomy** is a form of hormonal therapy used for the management of **advanced (metastatic) Prostate Cancer**. 1. **Why Prostate is correct:** Prostate cancer is an androgen-dependent malignancy. The primary goal of treatment in metastatic cases is **Androgen Deprivation Therapy (ADT)**. Since 95% of testosterone is produced by the Leydig cells in the testes, removing the testicular parenchyma achieves rapid surgical castration. In a "subcapsular" approach, the glandular tissue (testicular parenchyma) is removed while leaving the tunica albuginea and epididymis intact. This provides the same hormonal benefit as a total orchiectomy but offers a better cosmetic and psychological outcome for the patient. 2. **Why other options are incorrect:** * **Testes:** The standard surgery for testicular cancer is **Radical Inguinal Orchiectomy**. A subcapsular or trans-scrotal approach is strictly contraindicated as it risks scrotal seeding and alters lymphatic drainage. * **Penis & Urethra:** These malignancies are primarily managed via local excision, penectomy (partial/total), and lymph node dissection. They are not androgen-dependent, so orchiectomy plays no role in their standard management. **High-Yield Clinical Pearls for NEET-PG:** * **Hormonal Goal:** Orchiectomy aims to reduce serum testosterone to "castrate levels" (<50 ng/dL). * **Speed of Action:** Surgical castration is the fastest way to drop testosterone levels, making it ideal for patients with impending spinal cord compression (vertebral metastasis). * **LHRH Agonists vs. Orchiectomy:** While both are effective, LHRH agonists (e.g., Leuprolide) cause an initial "testosterone flare," whereas orchiectomy does not.
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