Colorectal Surgery Practice Questions

Q: In Duke's classification of colorectal carcinoma, stage A means?

Involvement up to the muscularis propria. **Explanation:** The **Dukes’ Classification** is a historical but high-yield staging system for colorectal cancer, primarily based on the depth of tumor invasion and the presence of nodal metastasis. 1. **Why Option A is correct:** **Dukes’ Stage A** defines a tumor that is confined to the bowel wall. Specifically, it involves the mucosa and submucosa, extending into but **not through the muscularis propria**. Because the tumor is contained within the muscular layer, the prognosis is excellent (5-year survival >90%). 2. **Why the other options are incorrect:** * **Option B:** Involvement **beyond** the muscularis propria (extending into the subserosa or pericolic fat) without lymph node involvement defines **Dukes’ Stage B**. * **Option C:** Any involvement of **regional lymph nodes**, regardless of the depth of the primary tumor, defines **Dukes’ Stage C**. * **Option D:** The presence of **distant metastasis** (e.g., liver, lung) was not part of the original Dukes’ classification but was later added as **Dukes’ Stage D** (Gabriel’s or Astler-Coller modification). **High-Yield Clinical Pearls for NEET-PG:** * **Astler-Coller Modification:** This is a common variation often tested. It splits Stage B and C into B1/B2 and C1/C2 based on whether the muscularis propria is penetrated. * **TNM Staging:** In modern practice, TNM has replaced Dukes’. Dukes’ A roughly correlates to **T1/T2 N0 M0**. * **Prognostic Factor:** The most important prognostic factor in colorectal cancer is the **status of lymph nodes** (Stage C). * **Most common site of metastasis:** The **liver** (via portal circulation).

Q: In sigmoid volvulus, the rotation occurs in which direction?

Anticlockwise. **Explanation:** Sigmoid volvulus occurs when the sigmoid colon twists around its mesenteric axis. The correct answer is **Anticlockwise** because of the anatomical orientation of the sigmoid mesocolon. 1. **Why Anticlockwise is Correct:** The sigmoid colon is a redundant loop of bowel attached to a narrow-based mesentery. In the majority of cases, the torsion occurs in an **anticlockwise direction** (from right to left). This twisting leads to a closed-loop obstruction, causing rapid bowel distension and potential ischemia due to compromised blood supply from the sigmoid arteries. 2. **Why other options are incorrect:** * **Clockwise:** While clockwise rotation is possible, it is statistically rare in sigmoid volvulus. Clockwise rotation is more characteristic of **Midgut Volvulus** (seen in malrotation). * **Both:** While torsion can theoretically occur in either direction, the standard clinical presentation and anatomical predisposition favor a single, dominant direction (anticlockwise). * **Axial:** Axial rotation refers to twisting along the longitudinal axis of the bowel itself (common in Cecal Volvulus), whereas sigmoid volvulus is primarily a mesenteric twist. **Clinical Pearls for NEET-PG:** * **Predisposing Factors:** A long, redundant sigmoid colon with a narrow mesenteric base (often seen in elderly patients or those with chronic constipation). * **Radiological Signs:** Look for the **"Coffee Bean Sign"** or **"Omega Sign"** on X-ray. On Barium Enema, it shows a **"Bird’s Beak"** or **"Ace of Spades"** appearance. * **Management:** The initial treatment of choice for stable patients is **Sigmoidoscopic Detorsion** (using a flatus tube). However, definitive surgery (sigmoid resection) is required to prevent recurrence.

Q: All are treatments of acute fissure in ano except one?

External sphincterotomy. **Explanation:** The primary pathophysiology of an anal fissure is a cycle of pain leading to **hypertonicity of the Internal Anal Sphincter (IAS)**, which causes ischemia and prevents the ulcer from healing. Therefore, all standard treatments aim to relax the internal sphincter. **Why "External Sphincterotomy" is the correct answer:** The **External Anal Sphincter (EAS)** is a voluntary muscle responsible for fecal continence. Surgically dividing this muscle (External Sphincterotomy) is **never** indicated for a fissure as it does not address the underlying internal sphincter hypertonicity and would result in permanent **fecal incontinence**. **Analysis of other options:** * **Conservative:** This is the first-line treatment for acute fissures. It includes a high-fiber diet, sitz baths, and topical pharmacological agents (GTN or Diltiazem) to relax the internal sphincter. * **Dilatation under GA (Lord’s Dilatation):** Historically used to break the cycle of spasm by stretching the anal canal. However, it is largely abandoned today due to the risk of uncontrolled sphincter tearing and incontinence. * **Lateral Sphincterotomy:** Specifically, **Lateral Internal Sphincterotomy (LIS)** is the "Gold Standard" surgical treatment for chronic or refractory fissures. It involves a controlled division of the lower part of the internal sphincter. **NEET-PG High-Yield Pearls:** * **Most common site:** Posterior midline (90%). Anterior midline fissures are more common in females (10-25%). * **Pathognomonic triad (Chronic Fissure):** Sentinel pile (skin tag), hypertrophied anal papilla, and the fissure itself (showing exposed fibers of the internal sphincter). * **Gold Standard Surgery:** Lateral Internal Sphincterotomy (LIS). * **Medical Sphincterotomy:** Use of Topical Nitroglycerin (0.2%) or Calcium Channel Blockers (Diltiazem).

Q: What is the treatment of choice for Hinchey Grade 2 diverticulitis?

Laparoscopy guided drain. ***Laparoscopy guided drain*** - **Grade 2 diverticulitis** (according to Hinchey classification) involves **pelvic or distant abscess formation**, requiring drainage for optimal management. - **Laparoscopic drainage** allows for precise visualization, complete evacuation of infected material, and **peritoneal lavage** while being minimally invasive. *Bowel resection* - Reserved for **Grade 3-4 diverticulitis** with **generalized peritonitis** or **fecal peritonitis**, not for localized abscess formation. - This is an **overly aggressive** approach for Grade 2 disease and carries higher morbidity and mortality risks. *USG guided drain* - Appropriate for **Grade 1 diverticulitis** with **small paracolic abscesses** that are easily accessible percutaneously. - **Grade 2 abscesses** in the pelvis or distant locations are often **not accessible** or adequately drained via ultrasound guidance alone. *Oral metronidazole* - Suitable for **uncomplicated diverticulitis** (Grade 0) without abscess formation or systemic complications. - **Inadequate for Grade 2** disease as it cannot address the established **abscess collection** requiring mechanical drainage.

Q: Which of the following is the commonest site for adenocarcinoma of the colon?

Sigmoid colon. **Explanation:** Colorectal cancer is one of the most common malignancies of the gastrointestinal tract. While the incidence of right-sided (proximal) colon cancers has been increasing in recent decades, the **sigmoid colon** remains the most common site for adenocarcinoma within the colon itself. **1. Why Sigmoid Colon is Correct:** Statistically, the distal colon is more prone to malignancy. The sigmoid colon accounts for approximately **25–35%** of all colorectal cancers. This is attributed to the prolonged contact time of concentrated fecal matter and carcinogens with the mucosa in this segment. When considering the entire "colorectum," the rectum is the single most common site (approx. 35-40%), but among the specific segments of the **colon**, the sigmoid leads. **2. Analysis of Incorrect Options:** * **Cecum (A):** This is the second most common site (approx. 15–20%). Cancers here often present with occult bleeding and iron deficiency anemia rather than obstruction. * **Ascending Colon (C):** While "right-sided" cancers are rising in frequency (especially in older females and those with HNPCC), the ascending colon specifically is less common than the sigmoid. * **Transverse Colon (D):** This is one of the least common sites for primary adenocarcinoma, accounting for only about 10% of cases. **Clinical Pearls for NEET-PG:** * **Overall Distribution:** Rectum (38%) > Sigmoid (25%) > Cecum (18%) > Ascending Colon (9%). * **Clinical Presentation:** Left-sided lesions (Sigmoid) typically present with **altered bowel habits** and **intestinal obstruction** (due to narrower lumen and solid stools). Right-sided lesions (Cecum) present with **anemia** and a **palpable mass** in the right iliac fossa. * **Apple Core Appearance:** This classic radiological sign on barium enema is most frequently seen in the sigmoid colon due to annular constricting tumors.

Q: What is the most common cause of painful defecation?

Fissure in ano. **Explanation:** The hallmark clinical feature of an **anal fissure** is severe, sharp, "knife-like" pain during and after defecation. This occurs because a linear tear in the distal anal canal (usually in the posterior midline) exposes the sensitive internal anal sphincter. The contact of stool with the tear triggers a **reflex spasm of the internal sphincter**, which leads to ischemia and intense, prolonged pain that can last for hours after the bowel movement. **Analysis of Incorrect Options:** * **Fistula in ano:** Typically presents with chronic purulent discharge and perianal itching. While it can be uncomfortable, it is generally not characterized by acute, severe pain unless an associated anorectal abscess has formed. * **External haemorrhoid:** These are usually asymptomatic unless they become **thrombosed**. A thrombosed external hemorrhoid causes sudden, constant, exquisite pain, but it is not specifically linked only to the act of defecation. * **Internal haemorrhoid:** These are characteristically **painless**. Their primary symptom is bright red, painless bleeding per rectum (painless streaks of blood on stool). Pain only occurs if they become prolapsed, strangulated, or thrombosed. **Clinical Pearls for NEET-PG:** * **Location:** 90% of primary fissures are in the **posterior midline**. An off-center (lateral) fissure should raise suspicion for systemic diseases like Crohn’s, TB, or HIV. * **Chronic Fissure Triad:** Sentinel pile (skin tag), hypertrophied anal papilla, and the visible internal sphincter fibers at the base of the ulcer. * **Management:** The gold standard surgical treatment is **Lateral Internal Sphincterotomy (LIS)**, which reduces the resting anal pressure.

Question 1

What type of stapler is used for Minimally Invasive Pararectal Hernia (MIPH)?

Accepted Answer

Circular cutting stapler

Answer

Linear cutting stapler

Answer

Linear stapler

Answer

Circular stapler

Question 2

In Duke's classification of colorectal carcinoma, stage A means?

Accepted Answer

Involvement up to the muscularis propria

Answer

Involvement beyond the muscularis propria

Answer

Positive lymph node involvement

Answer

Distant metastasis

Question 3

In sigmoid volvulus, the rotation occurs in which direction?

Accepted Answer

Anticlockwise

Answer

Clockwise

Answer

Both clockwise and anticlockwise

Answer

Axial in direction

Question 4

All are treatments of acute fissure in ano except one?

Accepted Answer

External sphincterotomy

Answer

Conservative

Answer

Dilatation under GA

Answer

Lateral sphincterotomy

Question 5

What is the treatment of choice for Hinchey Grade 2 diverticulitis?

Accepted Answer

Laparoscopy guided drain

Answer

Bowel resection

Answer

USG guided drain

Answer

Oral metronidazole

Question 6

A patient presents with rectal carcinoma situated 6 cm above the dentate line with no nodal metastasis. What is the treatment of choice?

Accepted Answer

Anterior resection

Answer

Abdominoperineal resection (APR)

Answer

Radiotherapy

Answer

Hamann's procedure

Question 7

What is the most common location of an anorectal fistula?

Accepted Answer

Intersphincteric

Answer

Transsphincteric

Answer

Suprasphincteric

Answer

Extrasphincteric

Question 8

A 65-year-old man presents with intermittent constipation and microcytic anemia. Barium enema shows a non-obstructing "apple-core" lesion in the proximal sigmoid colon. Colonoscopy confirms the mass and finds no synchronous lesions. What is the most appropriate next step in management?

Accepted Answer

Left hemicolectomy

Answer

Right hemicolectomy

Answer

Subtotal colectomy

Answer

Total colectomy

Question 9

Which of the following is the commonest site for adenocarcinoma of the colon?

Accepted Answer

Sigmoid colon

Answer

Cecum

Answer

Ascending colon

Answer

Transverse colon

Question 10

What is the most common cause of painful defecation?

Accepted Answer

Fissure in ano

Answer

Fistula in ano

Answer

External haemorrhoid

Answer

Internal haemorrhoid

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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