Colorectal Surgery Practice Questions

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.

Q: What is the most common facial abnormality observed in Gardner's syndrome?

Multiple osteomas. **Explanation:** **Gardner’s Syndrome** is a clinical variant of Familial Adenomatous Polyposis (FAP), inherited in an autosomal dominant fashion due to a mutation in the **APC gene** on chromosome 5q21. It is characterized by the triad of gastrointestinal polyps, soft tissue tumors, and skeletal abnormalities. **Why Multiple Osteomas is Correct:** Osteomas are the most common skeletal manifestation and the most frequent facial abnormality in Gardner’s syndrome. These are benign, slow-growing bony outgrowths that typically involve the **mandible** (angle of the jaw) and the skull. They often precede the development of intestinal polyposis, making them a crucial early diagnostic marker for clinicians. **Analysis of Incorrect Options:** * **Ectodermal dysplasia:** This is a group of genetic disorders affecting the skin, hair, nails, and sweat glands (e.g., Hypohidrotic ectodermal dysplasia). It is not a component of Gardner’s syndrome. * **Odontomas:** While dental abnormalities like impacted teeth, supernumerary teeth, and odontomas occur in Gardner’s syndrome, they are less frequent than osteomas. * **Dental cysts:** These are not a classic or defining feature of Gardner’s syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of Gardner’s:** 1. Colonic Polyposis (100% risk of malignancy), 2. Osteomas (Mandible/Skull), 3. Soft tissue tumors (Desmoid tumors, sebaceous cysts, fibromas). * **Desmoid Tumors:** These are locally aggressive tumors that often occur in the abdominal wall or mesentery following surgery; they are a significant cause of morbidity. * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is a highly specific ocular finding seen on fundoscopy in these patients.

Q: What condition is popularly referred to as "Left sided appendicitis"?

Diverticulitis. **Explanation:** **Diverticulitis** is popularly referred to as **"Left-sided appendicitis"** because its clinical presentation closely mimics that of acute appendicitis, but the pain and inflammation are localized in the **Left Lower Quadrant (LLQ)**. This is due to the high prevalence of diverticula in the **sigmoid colon**, which is situated on the left side of the pelvis. Similar to appendicitis, patients present with localized abdominal pain, fever, leucocytosis, and guarding/rebound tenderness. **Analysis of Incorrect Options:** * **Ascending colitis:** This involves inflammation of the right side of the colon. Pain would typically be localized to the right side, not the left. * **Descending colitis:** While this affects the left side, it is a general term for inflammation (often ischemic or ulcerative) and does not typically present with the acute, focal "appendicitis-like" inflammatory surgical picture seen in diverticulitis. * **Typhlitis (Neutropenic Enterocolitis):** This is an acute inflammation of the **cecum** (right-sided), typically seen in immunocompromised patients. It is sometimes called "Right-sided syndrome" in specific contexts but is not the "Left-sided appendicitis." **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Contrast-Enhanced CT (CECT) of the abdomen is the investigation of choice for acute diverticulitis. * **Contraindications:** Colonoscopy and Barium Enema are **strictly contraindicated** in the acute phase due to the high risk of perforation. * **Classification:** The **Hinchey Classification** is used to grade the severity of diverticulitis (Stage I: Pericolic abscess to Stage IV: Fecal peritonitis). * **True Left-sided Appendicitis:** This can actually occur in patients with **Situs Inversus** or a **Malrotated gut**, but "Left-sided appendicitis" as a clinical moniker specifically refers to Sigmoid Diverticulitis.

Q: Ten years after diagnosis of total proctocolitis, this patient undergoes colonoscopy and biopsy reveals high-grade dysplasia in 2-10 specimens. What should the physician recommend?

Total proctocolectomy. **Explanation:** This question addresses the management of precancerous lesions in patients with long-standing **Ulcerative Colitis (UC)**. Patients with total proctocolitis (pancolitis) for over 8–10 years are at a significantly increased risk for **Colorectal Cancer (CRC)**. **1. Why Option D is Correct:** In the setting of chronic UC, **High-Grade Dysplasia (HGD)** is a strong predictor of either synchronous or future malignancy. Studies show that approximately 40–50% of UC patients with HGD already have an undetected invasive adenocarcinoma elsewhere in the colon. Because the dysplasia in UC is often multifocal and difficult to visualize endoscopically (unlike sporadic polyps), the standard of care is **Total Proctocolectomy (TPC)**. This procedure is curative for both the underlying UC and the risk of malignancy. **2. Why Other Options are Incorrect:** * **Option A & C:** Surveillance (waiting 1 year) or simply repeating the biopsy is dangerous. Once HGD is confirmed by a gastrointestinal pathologist, the risk of occult cancer is too high to justify delay. * **Option B:** Steroids treat active inflammation (flare-ups) but have no role in treating or reversing cellular dysplasia or preventing cancer. **Clinical Pearls for NEET-PG:** * **Indications for Surgery in UC:** HGD, Low-Grade Dysplasia (LGD) if multifocal or associated with a lesion (DALM), persistent symptoms despite maximal medical therapy, or complications (perforation, toxic megacolon). * **Screening Protocol:** Surveillance colonoscopy should begin **8–10 years** after the diagnosis of pancolitis. * **DALM (Dysplasia Associated Lesion or Mass):** If a dysplastic lesion cannot be completely resected endoscopically, TPC is mandatory. * **Gold Standard Surgery:** Restorative Proctocolectomy with **Ileal Pouch-Anal Anastomosis (IPAA)** is the procedure of choice for most patients.

Question 1

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 2

What is the most common location of an anorectal fistula?

Accepted Answer

Intersphincteric

Answer

Transsphincteric

Answer

Suprasphincteric

Answer

Extrasphincteric

Question 3

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 4

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 5

What is the most common cause of painful defecation?

Accepted Answer

Fissure in ano

Answer

Fistula in ano

Answer

External haemorrhoid

Answer

Internal haemorrhoid

Question 6

What is the management for carcinoma of the sigmoid colon with obstruction?

Accepted Answer

Hamann's procedure

Answer

Resection and end-to-end anastomosis with proximal colostomy

Answer

Proximal colostomy with distal ligation

Answer

Sub-total colectomy

Question 7

What is the most common facial abnormality observed in Gardner's syndrome?

Accepted Answer

Multiple osteomas

Answer

Ectodermal dysplasia

Answer

Odontomas

Answer

Dental cysts

Question 8

External hemorrhoids, located below the dentate line, are characterized by which of the following?

Accepted Answer

Being painful

Answer

Management involving ligation

Answer

Absence of skin tags

Answer

Potential for malignant transformation

Question 9

What condition is popularly referred to as "Left sided appendicitis"?

Accepted Answer

Diverticulitis

Answer

Ascending colitis

Answer

Descending colitis

Answer

Typhlitis

Question 10

Ten years after diagnosis of total proctocolitis, this patient undergoes colonoscopy and biopsy reveals high-grade dysplasia in 2-10 specimens. What should the physician recommend?

Accepted Answer

Total proctocolectomy

Answer

Repeat colonoscopy in 1 year

Answer

Increase steroid dosage

Answer

Early repeat colonoscopy and biopsy of the area

Colorectal Surgery — MCQs

Colorectal Surgery — MCQs

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