Colorectal Surgery Practice Questions

Q: A 40-year-old male, a soldier, presented to the OPD with serous discharge and discomfort from the gluteal region. He reported a history of an abscess in the same area two years prior. Which of the following is a treatment option for this condition?

All of the above. **Explanation:** The clinical presentation of a middle-aged male (soldier) with chronic serous discharge and a history of an abscess in the gluteal region (natal cleft) is classic for **Pilonidal Sinus Disease (PNS)**. This condition is an acquired chronic inflammatory process caused by hair penetration into the subcutaneous tissue, common in individuals with sedentary occupations or those subjected to repetitive local trauma (e.g., "Jeep bottom"). **Why "All of the above" is correct:** The management of pilonidal sinus aims to excise the diseased tissue and prevent recurrence by flattening the deep natal cleft. * **Limberg’s Flap:** A type of **Rhomboid flap** where a diamond-shaped excision is performed, and a transposition flap is used to cover the defect. It is highly effective in reducing recurrence. * **Karydakis Flap:** An asymmetrical lateralization procedure where the wound is closed off-center from the midline to avoid tension and moisture accumulation in the cleft. * **Bascom’s Procedure:** A "minimal surgery" technique involving "pit picking" (excision of the midline pits) and a lateral incision for drainage. **Clinical Pearls for NEET-PG:** * **Risk Factors:** Obesity, hirsutism, deep natal cleft, and prolonged sitting (Soldiers/Drivers). * **Pathogenesis:** It is an **acquired** condition, not congenital. * **Primary Treatment:** Simple excision and primary closure have high recurrence rates. Flap reconstructions (Limberg, Karydakis) are preferred for recurrent or complex cases. * **Z-plasty:** Another flap technique used to flatten the natal cleft.

Q: Internal fistulas associated with colonic diverticulitis are most commonly what type?

Colovesical. **Explanation:** In the context of chronic or recurrent diverticulitis, transmural inflammation can lead to the formation of an abscess that subsequently ruptures into an adjacent organ, creating an **internal fistula**. **1. Why Colovesical is Correct:** The **colovesical fistula** (communication between the colon and the bladder) is the most common type of internal fistula associated with diverticulitis, accounting for approximately **65% of cases**. This occurs due to the anatomical proximity of the sigmoid colon (the most common site for diverticulitis) to the urinary bladder. It is significantly more common in males because the uterus acts as a protective barrier between the colon and bladder in females. **2. Analysis of Incorrect Options:** * **Coloenteric (B):** Communication with the small bowel. While common, it occurs less frequently than colovesical. * **Colocolonic (C):** Communication between two segments of the colon; these are often asymptomatic and less common. * **Colovaginal (D):** Communication with the vagina. This is the second most common type in females, particularly those who have undergone a hysterectomy. **3. High-Yield Clinical Pearls for NEET-PG:** * **Classic Presentation:** Patients typically present with **pneumaturia** (gas in urine) and **fecaluria** (feces in urine), alongside recurrent UTIs. * **Diagnostic Gold Standard:** While CT scan is the initial investigation of choice to show air in the bladder, **cystoscopy** is often performed to rule out malignancy, though it may only show localized edema (bullous cystitis). * **Bourne Test:** A high-yield historical test where charcoal is given orally and later detected in the urine to confirm the fistula. * **Management:** Surgical resection of the diseased colonic segment (usually sigmoidectomy) with primary anastomosis and closure of the bladder defect.

Q: What is the standard treatment for stage II carcinoma of the anal canal?

Concurrent chemoradiation. **Explanation:** The standard of care for most squamous cell carcinomas (SCC) of the anal canal (Stage I to III) is **Concurrent Chemoradiation**, also known as the **Nigro Protocol**. 1. **Why Option C is Correct:** Unlike rectal cancer, where surgery is often the primary modality, anal canal cancer is highly radiosensitive and chemosensitive. The Nigro Protocol (typically using 5-Fluorouracil and Mitomycin-C combined with external beam radiation) achieves high rates of local control and, crucially, allows for **sphincter preservation**. This avoids the need for a permanent colostomy while maintaining survival rates comparable to radical surgery. 2. **Why Other Options are Incorrect:** * **Option A & B:** Abdominoperineal Resection (APR) involves the permanent removal of the rectum and anus. It was historically the first-line treatment but is now reserved only for **salvage therapy** (recurrent or persistent disease after chemoradiation) or for patients who cannot tolerate radiation. * **Option D:** Neoadjuvant chemotherapy followed by surgery is not a standard protocol for anal SCC; concurrent administration is required to exploit the radiosensitizing effects of the chemotherapy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common histology:** Squamous Cell Carcinoma (associated with **HPV 16 and 18**). * **Lymphatic Drainage:** Above the dentate line to internal iliac nodes; below the dentate line to **superficial inguinal nodes**. * **Nigro Protocol Components:** 5-FU + Mitomycin + Radiation (Note: Cisplatin may be used in metastatic cases). * **Treatment Exception:** Very small (Stage IA, <2cm), well-differentiated tumors of the **anal margin** (not canal) may be treated with wide local excision alone.

Q: What is the recommended patient position for the surgical treatment of a pilonidal sinus?

Jack knife position. **Explanation:** The **Jack-knife (Kraske) position** is the preferred surgical position for pilonidal sinus excision. In this position, the patient is prone with the hips flexed over a bolster or the break in the operating table, and the buttocks are taped apart. **Why Jack-knife is correct:** 1. **Optimal Exposure:** It provides the best visualization of the sacrococcygeal area and the natal cleft. 2. **Anatomical Access:** By flexing the hips and using adhesive tape to retract the buttocks laterally, the deep midline cleft is flattened, making it easier to identify sinus tracts and perform wide local excision or flap reconstruction (like the Limberg flap). 3. **Venous Drainage:** It helps in reducing venous congestion in the operative field compared to a flat prone position. **Why other options are incorrect:** * **Sim’s position:** This is a lateral decubitus position used primarily for rectal examinations or colonoscopy, but it does not provide the symmetrical exposure required for pilonidal surgery. * **Prone position:** While the patient is face down, a standard flat prone position does not adequately open the gluteal cleft, making deep dissection difficult. * **Supine position:** This is used for abdominal or anterior thoracic surgeries; the sacrococcygeal area is completely inaccessible. **High-Yield Clinical Pearls for NEET-PG:** * **Pilonidal Sinus:** Most commonly occurs in the **sacrococcygeal region** in young, hairy males ("Jeep driver’s disease"). * **Primary Treatment:** Wide local excision with healing by secondary intention or primary closure (e.g., **Bascom’s procedure** or **Limberg flap**). * **Jack-knife Position:** Also used for other proctological procedures like hemorrhoidectomy and anal fistula surgery. * **Anesthesia:** Usually performed under spinal or general anesthesia.

Q: Which of the following is not a treatment method for fissure in ano?

Seton's procedure. **Explanation:** The primary pathophysiology of a chronic anal fissure is **internal anal sphincter hypertonia**, which leads to ischemia and prevents the ulcer from healing. Therefore, treatment focuses on relaxing the internal sphincter. **Why Seton’s procedure is the correct answer:** A **Seton** (a non-absorbable thread or silastic loop) is used exclusively in the management of **Fistula-in-ano**, not fissures. It is passed through the fistula tract to either induce controlled fibrosis (slow-cutting Seton) or to facilitate drainage (loose Seton) while preserving fecal continence. It has no role in the treatment of an anal fissure. **Analysis of other options:** * **Sitz bath (Option A):** A mainstay of conservative management. Warm water helps relax the internal anal sphincter and improves local blood flow (anoderm perfusion), promoting healing. * **Diltiazem gel (Option C):** A topical Calcium Channel Blocker (CCB) used as first-line medical management. It reduces resting anal pressure without the side effects (like headaches) commonly associated with Nitroglycerin (GTN) ointment. * **Botox injection (Option B):** Botulinum toxin is injected into the internal sphincter to cause temporary paralysis (chemical sphincterotomy). It is used for chronic fissures resistant to topical therapies. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Treatment:** Lateral Internal Sphincterotomy (LIS) is the surgical procedure of choice for chronic fissures. * **Location:** Most common site is the **posterior midline (6 o'clock)**. If found laterally, suspect secondary causes like Crohn’s, TB, or malignancy. * **Clinical Triad (Brodie’s Triad):** Deep ulcer, hypertrophied anal papilla (proximal), and sentinel pile/tag (distal).

Q: What is the appropriate treatment for pneumoperitoneum resulting from colonoscopic perforation in a young patient?

Closure and lavage. **Explanation:** The management of colonoscopic perforation depends on the timing of diagnosis, the patient’s clinical stability, and the degree of peritoneal contamination. **Why "Closure and Lavage" is correct:** In a young, otherwise healthy patient, colonoscopic perforations are typically diagnosed early. Because the colon is usually prepped (cleansed) before the procedure, the resulting peritoneal contamination is often minimal. If the patient is hemodynamically stable and shows signs of peritonitis (pneumoperitoneum), the standard surgical approach is **primary closure of the perforation** followed by **peritoneal lavage** [1]. Primary repair is highly successful in these cases because the bowel wall is healthy and not diseased by chronic inflammation or ischemia. **Analysis of Incorrect Options:** * **A & C (Temporary/Permanent Colostomy):** Diversion is generally reserved for unstable patients, cases with delayed diagnosis (>24 hours), or instances of gross fecal contamination and severe sepsis [2]. In a young patient with a clean colon, a stoma is unnecessarily morbid. * **D (Symptomatic treatment):** While "conservative management" (NPO, antibiotics) can be used for small, asymptomatic "silent" perforations, the presence of significant pneumoperitoneum and clinical symptoms in a surgical context usually mandates operative intervention [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of perforation:** Sigmoid colon (due to its tortuosity and use of torque). * **Gold Standard Diagnosis:** CT scan with oral/rectal contrast (more sensitive than X-ray). * **Conservative Management Criteria:** Only if the patient is stable, has no signs of generalized peritonitis, and shows clinical improvement within 24 hours. * **Key Factor:** The "cleanliness" of the bowel (prepped vs. unprepped) is the primary determinant between primary repair and colostomy [2].

Question 1

What is true about colonic volvulus?

Accepted Answer

Common in psychiatric patients

Answer

Most common in the cecum

Answer

Associated with a bird's beak sign on imaging

Answer

Can present as intestinal obstruction

Question 2

Which of the following structures is removed in an extended right colectomy?

Accepted Answer

Ascending colon, cecum, terminal ileum, a portion of the transverse colon, the spleen, and the gallbladder

Answer

Ascending colon, cecum, terminal ileum, and a portion of the transverse colon

Answer

Ascending colon, cecum, terminal ileum, a portion of the transverse colon, and the spleen

Answer

Ascending colon, cecum, terminal ileum, a portion of the transverse colon, the spleen, the gallbladder, and the pancreas

Question 3

A 40-year-old male, a soldier, presented to the OPD with serous discharge and discomfort from the gluteal region. He reported a history of an abscess in the same area two years prior. Which of the following is a treatment option for this condition?

Accepted Answer

All of the above

Answer

Limberg's flap

Answer

Karydakis flap and rhomboid flap

Answer

Bascom's procedure

Question 4

Internal fistulas associated with colonic diverticulitis are most commonly what type?

Accepted Answer

Colovesical

Answer

Coloenteric

Answer

Colocolonic

Answer

Colovaginal

Question 5

What is the standard treatment for stage II carcinoma of the anal canal?

Accepted Answer

Concurrent chemoradiation

Answer

Abdominoperineal resection (APR)

Answer

APR followed by chemoradiation

Answer

Neoadjuvant chemotherapy followed by surgery

Question 6

What is the recommended patient position for the surgical treatment of a pilonidal sinus?

Accepted Answer

Jack knife position

Answer

Sim's position

Answer

Prone position

Answer

Supine position

Question 7

A 48-year-old man with a longstanding history of chronic constipation complains of anal itching and discomfort toward the end of the day. He describes perianal pain when sitting and finds himself sitting sideways to avoid discomfort. Physical examination reveals painful varicose dilations in the anal region, associated with edema. Which of the following is the most likely diagnosis?

Accepted Answer

Hemorrhoids

Answer

Anal cancer

Answer

Anal fissure

Answer

Ischiorectal abscess

Question 8

All of the following are true about ischemic colitis except:

Accepted Answer

Ischemia is more common in the small bowel as compared to the large bowel.

Answer

The inferior mesenteric artery (IMA) is commonly occluded in cases needing aortic ischemia.

Answer

The most common site of post-ischemic stricture is the sigmoid colon.

Answer

Transection of the IMA does not necessitate reimplantation if aortic surgery is attempted.

Question 9

Which of the following is not a treatment method for fissure in ano?

Accepted Answer

Seton's procedure

Answer

Sitz bath

Answer

Botox injection

Answer

Diltiazem gel

Question 10

What is the appropriate treatment for pneumoperitoneum resulting from colonoscopic perforation in a young patient?

Accepted Answer

Closure and lavage

Answer

Temporary colostomy

Answer

Permanent colostomy

Answer

Symptomatic treatment

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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