Colorectal Surgery — MCQs

Colorectal Surgery Indian Medical PG Practice Questions and MCQs

Question 101: Carcinoma of the colon develops in all patients with:

A. Juvenile polyposis
B. Hemaomatous polyp
C. Inflammatory polyps
D. Familial adenomatous polyposis (Correct Answer)

Explanation: **Explanation:** **Familial Adenomatous Polyposis (FAP)** is an autosomal dominant condition caused by a germline mutation in the **APC (Adenomatous Polyposis Coli) gene** on chromosome 5q21. It is characterized by the development of hundreds to thousands of adenomatous polyps throughout the colon. The risk of progression to colorectal carcinoma is **virtually 100%** by the age of 40–50 years if a prophylactic total proctocolectomy is not performed. This makes it the only condition among the options where malignancy is an absolute certainty. **Analysis of Incorrect Options:** * **Juvenile Polyposis:** These are hamartomatous polyps. While Juvenile Polyposis *Syndrome* carries an increased lifetime risk of cancer (approx. 10–50%), the individual polyps themselves are not premalignant, and cancer does not develop in "all" patients. * **Hamartomatous Polyps:** These are non-neoplastic malformations of normal tissue. Examples include Peutz-Jeghers polyps. While they can be part of syndromes with increased cancer risk, the polyps themselves have low malignant potential compared to adenomas. * **Inflammatory Polyps (Pseudopolyps):** These are seen in Ulcerative Colitis or Crohn’s disease as a result of mucosal regeneration. They are **not premalignant** and do not progress to carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Gardner Syndrome:** FAP + Osteomas (mandible) + Desmoid tumors + Sebaceous cysts. * **Turcot Syndrome:** FAP + CNS tumors (Medulloblastoma). * **Screening:** For FAP, screening via flexible sigmoidoscopy should begin at **10–12 years of age**. * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is a specific extra-colonic marker for FAP.

Question 102: Hinchey classification is used for perforations of the colon secondary to which of the following conditions?

A. Trauma
B. Carcinoma
C. Diverticulitis (Correct Answer)
D. Inflammatory enteropathy

Explanation: **Explanation:** The **Hinchey Classification** is the gold-standard clinical staging system used to categorize the severity of acute complications arising from **Diverticulitis**, specifically perforated colonic diverticulitis. It guides surgical management by assessing the extent of peritoneal contamination. * **Stage I:** Pericolic or mesenteric abscess (localized). * **Stage II:** Walled-off pelvic abscess. * **Stage III:** Generalized purulent peritonitis (ruptured abscess). * **Stage IV:** Generalized fecal peritonitis (free perforation). **Why other options are incorrect:** * **Trauma:** Colonic injuries due to trauma are typically graded using the **AAST (American Association for the Surgery of Trauma)** Organ Injury Scale. * **Carcinoma:** Perforations secondary to malignancy are staged using the **TNM system** and specific surgical descriptors, but not Hinchey. * **Inflammatory Enteropathy (IBD):** While conditions like Ulcerative Colitis can lead to toxic megacolon or perforation, they are managed based on clinical severity scores (e.g., Truelove and Witts) rather than the Hinchey scale. **High-Yield Pearls for NEET-PG:** * **Modified Hinchey Classification:** Often used today; it splits Stage I into **Ia** (Phlegmon/peridiverticulitis) and **Ib** (Confined abscess). * **Management Trend:** Stage I and II are usually managed conservatively with antibiotics or CT-guided drainage. Stage III and IV traditionally require surgery (Hartmann’s Procedure or Primary Anastomosis with diverting stoma). * **Most common site:** Diverticulitis most commonly affects the **Sigmoid Colon** due to high intraluminal pressure.

Question 103: What is the most common serious complication of an end colostomy?

A. Bleeding
B. Skin breakdown
C. Parastomal hernia (Correct Answer)
D. Stomal prolapse

Explanation: **Explanation:** The correct answer is **Parastomal hernia**. A parastomal hernia is essentially an incisional hernia occurring through the abdominal wall defect created for the stoma. It is considered the **most common long-term/serious complication** of an end colostomy, with an incidence reported between 30% and 50% in long-term follow-ups. The underlying mechanism involves the gradual stretching of the fascial opening by intra-abdominal pressure, leading to the protrusion of omentum or bowel loops. While many are asymptomatic, they are "serious" because they can lead to incarceration, strangulation, or difficulty in maintaining an adequate stoma seal. **Analysis of Incorrect Options:** * **Bleeding:** Usually occurs in the immediate postoperative period due to inadequate hemostasis of the stomal edge or mesenteric vessels. It is common but rarely "serious" or a long-term structural failure. * **Skin breakdown (Peristomal dermatitis):** This is the **most common overall** minor complication, usually caused by leakage of effluent (more common in ileostomies). While frequent, it is managed topically and is not classified as a major surgical complication. * **Stomal prolapse:** This involves the telescoping of the bowel through the stoma. While it occurs in end colostomies, it is significantly **more common in loop colostomies** (especially the distal limb). **High-Yield Clinical Pearls for NEET-PG:** * **Most common overall complication:** Peristomal skin irritation. * **Most common late/serious complication:** Parastomal hernia. * **Stomal Stenosis:** Usually a result of ischemia or chronic skin irritation. * **Prevention:** Placing the stoma through the rectus muscle (though debated) and prophylactic mesh placement during stoma creation are strategies used to reduce hernia rates.

Question 104: Which of the following statements is TRUE about Rectal carcinoma?

A. Most common type is adenocarcinoma, Surgery is the treatment of choice, and APR is done in lesions of the upper zone
B. Most common type is adenocarcinoma, Surgery is the treatment of choice, and Surgical treatment is indicated in spite of hepatic metastasis (Correct Answer)
C. Surgery is the treatment of choice, Surgical treatment is indicated in spite of hepatic metastasis, and APR is done in lesions of the upper zone
D. All of the above statements are true

Explanation: **Explanation:** Rectal carcinoma is a high-yield topic for NEET-PG, focusing on pathology and surgical management. **Why Option B is Correct:** 1. **Histology:** **Adenocarcinoma** is the most common histological type of rectal cancer (approx. 95%). 2. **Primary Treatment:** **Surgery** remains the mainstay of curative treatment. 3. **Metastatic Management:** Unlike many other cancers, surgical resection of the primary tumor is often indicated even in the presence of **hepatic metastasis**. If the liver metastases are resectable (solitary or limited to one lobe), a synchronous or staged resection can offer a chance at cure. Even in unresectable cases, surgery may be performed palliatively to prevent obstruction or bleeding. **Why Other Options are Incorrect:** * **Options A and C:** Both mention that **Abdominoperineal Resection (APR)** is done for lesions in the **upper zone**. This is **incorrect**. APR (Miles' operation) involves the removal of the anus and rectum with a permanent colostomy; it is reserved for **lower-third** lesions (within 5 cm of the anal verge) where a sphincter-saving procedure is not possible. Upper and middle-third lesions are treated with **Anterior Resection (AR)** or Low Anterior Resection (LAR). * **Option D:** Since the statement regarding APR in the upper zone is false, "All of the above" cannot be correct. **High-Yield Clinical Pearls for NEET-PG:** * **Distance from Anal Verge:** Upper rectum (10–15 cm), Middle (5–10 cm), Lower (<5 cm). * **TNM Staging:** The most important prognostic factor is the depth of invasion and nodal status. * **Neoadjuvant Therapy:** Pre-operative chemoradiotherapy (CRT) is the standard of care for T3/T4 or node-positive (Stage II/III) rectal cancers to downstage the tumor. * **Total Mesorectal Excision (TME):** This is the gold standard surgical technique to reduce local recurrence rates.

Question 105: A 60-year-old man with left colon cancer presents with acute left colonic obstruction. What is the appropriate treatment?

A. Primary resection and Hartmann's procedure
B. Defunctioning colostomy
C. Right hemicolectomy
D. Resection of the entire left colon with end-to-end anastomosis (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Resection of the entire left colon with end-to-end anastomosis** The management of acute malignant left-sided colonic obstruction has evolved. While traditionally managed in stages, the current preferred approach for a fit patient is a **one-stage procedure**: primary resection with anastomosis. The underlying medical concept is that the dilated, thin-walled proximal colon in an obstruction is often filled with solid fecal matter and bacteria, making a safe anastomosis difficult. To overcome this, the surgeon performs a **subtotal colectomy** (resection of the entire left colon) or an **on-table colonic lavage**. By resecting the dilated segment and anastomosing the healthy ileum or right colon to the rectum, the risk of anastomotic leak is significantly reduced compared to a simple segmental resection. **Why other options are incorrect:** * **A. Hartmann’s Procedure:** This involves resection and a terminal colostomy. While safe, it is now generally reserved for unstable (hemodynamically compromised) patients or those with fecal peritonitis, as it requires a second major surgery for reversal. * **B. Defunctioning Colostomy:** This is a palliative or "staged" approach that relieves obstruction but leaves the tumor in situ. It is no longer the first-line treatment for resectable growth. * **C. Right Hemicolectomy:** This is the treatment for cecal or ascending colon cancers, not left-sided obstruction. **Clinical Pearls for NEET-PG:** * **Gold Standard:** For obstructed left-sided growth in a stable patient, **Subtotal Colectomy with Ileorectal Anastomosis** is often preferred over segmental resection to avoid the need for a stoma. * **On-table Colonic Lavage:** If a segmental resection is planned, this technique allows for a primary anastomosis by cleansing the proximal colon during surgery. * **Self-Expanding Metal Stents (SEMS):** Can be used as a "bridge to surgery" to convert an emergency procedure into an elective one.

Question 106: The appearance of anastomotic leakage following a low colonic anastomosis most often manifests:

A. 1-4 days
B. 5-10 days (Correct Answer)
C. 11-15 days
D. 16-20 days

Explanation: **Explanation:** Anastomotic leakage is one of the most dreaded complications in colorectal surgery. The timing of its manifestation is rooted in the biological phases of wound healing. **Why 5-10 days is correct:** The integrity of a colonic anastomosis depends on the balance between collagen synthesis and collagen lysis. During the first **4 days (Lag Phase)**, the strength of the anastomosis relies almost entirely on the sutures/staples because the new collagen has not yet gained structural strength. Between **days 5 and 10**, the initial collagen is being degraded by matrix metalloproteinases while new collagen is being synthesized. This "remodeling" period is when the anastomosis is at its **physiologically weakest point**. If the healing process is impaired (due to ischemia, tension, or malnutrition), the leak typically manifests clinically during this window. **Analysis of Incorrect Options:** * **1-4 days:** Leaks occurring this early are rare and usually indicate a major technical failure (e.g., gross ischemia or a missed iatrogenic injury) rather than a failure of the biological healing process. * **11-15 days & 16-20 days:** By this stage, the proliferative phase of healing is well-established, and the anastomosis has gained significant tensile strength. While "late leaks" can occur, they are statistically much less common. **High-Yield Clinical Pearls for NEET-PG:** * **Most sensitive early sign:** Unexplained **tachycardia** is often the first clinical sign of a leak. * **Gold Standard Investigation:** CT scan with rectal (water-soluble) contrast is the investigation of choice. * **Risk Factors:** Male sex, low rectal anastomosis (<6 cm from anal verge), preoperative radiotherapy, and tobacco use. * **Management:** Stable patients with small contained leaks may be managed conservatively (NPO, antibiotics); unstable patients require urgent re-laparotomy and usually a diverting stoma.

Question 107: Which of the following is true about diverticulitis?

A. Occurs at any age (Correct Answer)
B. Often an incidental finding at operation
C. Young patients have more aggressive disease
D. Left-sided colon involvement is more common

Explanation: **Explanation:** Diverticulitis is the inflammation of a colonic diverticulum, typically resulting from micro-perforation of the diverticular wall. **Why Option A is Correct:** While the prevalence of diverticulosis increases significantly with age (affecting >60% of people over 80), **diverticulitis can occur at any age**. In recent years, there has been a rising incidence in younger populations (under 40), often linked to obesity and low-fiber diets. **Analysis of Incorrect Options:** * **Option B:** Diverticulitis is a clinical diagnosis characterized by acute abdominal pain (usually left lower quadrant), fever, and leukocytosis. It is **rarely an incidental finding** at operation; rather, it is the primary indication for emergency surgery if complications like perforation or abscess occur. * **Option C:** Traditional teaching suggested that young patients have a more aggressive course. However, contemporary data and guidelines (including ASCRS) indicate that **age is not a predictor of severity**. The disease follows a similar natural history in both young and elderly patients. * **Option D:** While diverticulosis is more common in the **left colon (Sigmoid)** in Western populations, the question asks what is *true* about the disease generally. In Asian populations (relevant for NEET-PG), **Right-sided (Caecal) diverticulitis** is significantly more common. Therefore, stating left-sided involvement is "more common" is not a universal truth compared to the fact that it can occur at any age. **High-Yield Clinical Pearls for NEET-PG:** * **Investigation of Choice:** Contrast-enhanced CT (CECT) scan. * **Hinchey Classification:** Used to grade the severity of perforated diverticulitis. * **Management:** Uncomplicated cases are managed conservatively (bowel rest/antibiotics). Surgery (Hartmann’s procedure or primary anastomosis) is reserved for Hinchey III/IV. * **Contraindication:** Colonoscopy and Barium Enema are contraindicated in the acute phase due to the risk of perforation.

Question 108: Which of the following statements regarding Hirschsprung's disease are correct?

A. Absence of ganglia in the involved segment (Correct Answer)
B. The involved segment is dilated
C. Bleeding per rectum is a presenting feature
D. Surgery is used in therapy

Explanation: **Explanation:** Hirschsprung’s disease (Congenital Megacolon) is characterized by the **absence of ganglion cells** (Auerbach’s and Meissner’s plexuses) in the distal bowel. This occurs due to the failure of neural crest cells to migrate cranio-caudally during the 5th to 12th weeks of gestation. * **Why Option A is Correct:** The hallmark of the disease is an **aganglionic segment** starting at the internal anal sphincter and extending proximally. This segment remains in a state of tonic contraction because it lacks the inhibitory neurons required for relaxation, leading to a functional bowel obstruction. * **Why Option B is Incorrect:** The **involved (aganglionic) segment is narrow** or contracted. It is the **proximal normal bowel** that becomes massively dilated (megacolon) as it attempts to push stool past the distal obstruction. * **Why Option C is Incorrect:** The classic presentation is **delayed passage of meconium** (>48 hours), abdominal distension, and bilious vomiting. Bleeding per rectum is not a typical feature unless complicated by enterocolitis. * **Why Option D is Incorrect (Contextual):** While surgery (e.g., Duhamel, Soave, or Swenson procedures) is indeed the definitive treatment, in the context of defining the disease pathology for NEET-PG, the **absence of ganglia** is the primary diagnostic and pathognomonic feature. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Full-thickness rectal biopsy (shows absence of ganglion cells and hypertrophied nerve bundles). * **Histochemistry:** Increased **Acetylcholinesterase (AChE)** staining is a classic finding. * **Associated Condition:** Strongly associated with **Down Syndrome** (Trisomy 21). * **Physical Exam:** "Blast sign" or "Squirt sign" (explosive release of stool/gas upon digital rectal examination).

Question 109: Rotation of sigmoid volvulus occurs:

A. Clockwise
B. Anticlockwise (Correct Answer)
C. Initially clockwise then anticlockwise
D. Either clockwise or anticlockwise

Explanation: **Explanation:** Sigmoid volvulus is the most common type of colonic volvulus, occurring when the sigmoid colon twists on its mesenteric axis. **1. Why Anticlockwise is Correct:** The sigmoid colon is a redundant loop of bowel attached to a narrow mesenteric base. In the majority of clinical cases, the torsion occurs in an **anticlockwise (counter-clockwise)** direction. This is attributed to the anatomical orientation of the sigmoid mesocolon. As the loop twists, it creates a "closed-loop" obstruction, leading to rapid luminal distension and potential vascular compromise (gangrene). **2. Analysis of Incorrect Options:** * **Option A (Clockwise):** While clockwise rotation is theoretically possible, it is statistically rare in the sigmoid colon. Conversely, **Cecal volvulus** is more frequently associated with a clockwise rotation. * **Option B & C:** Torsion is a definitive mechanical event in one direction. There is no physiological or clinical evidence to suggest a biphasic rotation (initial clockwise then anticlockwise) or an equal distribution between the two directions. **3. NEET-PG High-Yield Pearls:** * **Predisposing Factors:** A long redundant sigmoid colon with a narrow base of mesenteric attachment (often seen in elderly patients or those with chronic constipation). * **Radiological Sign:** The classic **"Coffee Bean Sign"** or "Omega Sign" on X-ray. On CT, the **"Whirl Sign"** represents the twisted mesentery. * **Barium Enema:** Shows a characteristic **"Bird’s Beak"** or "Ace of Spades" appearance. * **Management:** The initial treatment of choice for stable patients without signs of gangrene is **Sigmoidoscopic Decompression** (using a flatus tube). However, because the recurrence rate is high (>50%), a definitive elective resection is usually recommended.

Question 110: What is the most common cause of colonic obstruction?

A. Volvulus
B. Hernia
C. Adhesions
D. Neoplasm (Correct Answer)

Explanation: **Explanation:** **Correct Answer: D. Neoplasm** In adults, **colorectal carcinoma (neoplasm)** is the most common cause of large bowel obstruction (LBO), accounting for approximately 60% of cases. The obstruction typically occurs in the sigmoid colon due to its narrower lumen and the presence of solid stool. Unlike the small bowel, where extrinsic causes like adhesions are common, the large bowel is most frequently obstructed by **intrinsic** luminal pathologies. **Analysis of Incorrect Options:** * **A. Volvulus:** This is the second most common cause of colonic obstruction worldwide (approx. 10–15%). Sigmoid volvulus is the most frequent subtype, characterized by a "coffee bean" sign on X-ray. It is more common in elderly, institutionalized patients or specific geographic regions (the "volvulus belt"). * **B. Hernia:** While incarcerated hernias are a leading cause of **small** bowel obstruction, they rarely cause primary colonic obstruction, except in cases of large sliding inguinal hernias. * **C. Adhesions:** This is the **most common cause of small bowel obstruction (SBO)**. Adhesions rarely cause colonic obstruction because the colon is largely retroperitoneal and fixed, making it less susceptible to kinking from adhesive bands. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of LBO:** Sigmoid colon. * **Most common cause of SBO:** Post-operative adhesions. * **Diverticulitis:** The third most common cause of LBO, resulting from stricture formation. * **Ogilvie’s Syndrome:** Acute pseudo-obstruction of the colon (dilation without mechanical cause), often seen in elderly patients with metabolic imbalances or post-surgery. * **Initial Imaging:** Erect abdominal X-ray (shows peripheral distribution of gas and haustral lines). **Contrast CT** is the gold standard for diagnosing the cause and site.

Practice by Chapter

Colorectal Anatomy and Physiology

Practice Questions

Diverticular Disease

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Colorectal Polyps

Practice Questions

Colorectal Cancer

Practice Questions

Anorectal Abscess and Fistula

Practice Questions

Hemorrhoids

Practice Questions

Rectal Prolapse

Practice Questions

Fecal Incontinence

Practice Questions

Intestinal Stomas Creation and Management

Practice Questions

Pelvic Floor Disorders

Practice Questions

Enhanced Recovery After Colorectal Surgery

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free