Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 731: Which of the following are predisposing factors for sigmoid volvulus?

A. Band of adhesion
B. Long pelvic meso colon
C. Narrow attachment of pelvic mesocolon
D. All of the above (Correct Answer)

Explanation: **Explanation:** Sigmoid volvulus is the most common type of colonic volvulus, occurring when the sigmoid colon twists around its mesenteric axis. This leads to a closed-loop obstruction and potential strangulation. **Why "All of the above" is correct:** The fundamental requirement for a volvulus is a **redundant (long) loop of bowel** attached to a **narrow mesenteric base**. * **Long pelvic mesocolon (Option B):** A redundant sigmoid colon provides the necessary length for the loop to rotate. This is common in populations with high-fiber diets or chronic constipation. * **Narrow attachment of pelvic mesocolon (Option C):** When the two ends of the sigmoid loop are close together at the base (narrow pedicle), it acts as a pivot point, making it anatomically easier for the bowel to twist. * **Band of adhesion (Option A):** While the first two are the primary anatomical predispositions, an acquired band of adhesion can act as a fixed fulcrum or "point of rotation" around which the mobile sigmoid loop can twist, precipitating the volvulus. **Clinical Pearls for NEET-PG:** * **Classic Presentation:** Elderly patient with massive abdominal distension, absolute constipation, and "tympanitic" percussion note. * **Radiology:** The pathognomonic sign on X-ray is the **"Coffee Bean Sign"** or **"Omega Sign"** (the convexity of the loop points toward the right upper quadrant). * **Barium Enema:** Shows a characteristic **"Bird’s Beak"** or **"Ace of Spades"** appearance at the site of the twist. * **Management:** * *Non-gangrenous:* Sigmoidoscopic detorsion using a flatus tube is the initial treatment of choice. * *Gangrenous/Perforated:* Emergency surgery (Hartmann’s procedure) is required.

Question 732: Sudden hematemesis in a patient with a history of alcohol abuse, presenting with a mucosal tear, is most suggestive of which condition?

A. Mallory-Weiss tear (Correct Answer)
B. Dieulafoy's lesion
C. Boerhaave syndrome
D. Menetrier's disease

Explanation: ### Explanation **Correct Answer: A. Mallory-Weiss tear** **Mechanism and Presentation:** A Mallory-Weiss tear is a **longitudinal mucosal laceration** located at the gastroesophageal junction or the gastric cardia. The underlying pathophysiology involves a sudden, massive increase in intra-abdominal pressure, typically caused by forceful **retching, vomiting, or coughing**—often following an episode of heavy alcohol consumption. This pressure gradient causes the gastric contents to force the cardia against a closed sphincter, resulting in a mucosal tear and subsequent arterial bleeding (hematemesis). **Why the other options are incorrect:** * **B. Dieulafoy's lesion:** This is a vascular malformation involving a large, tortuous submucosal artery that erodes the overlying epithelium. It presents as massive, painless hematemesis without a history of retching or a specific mucosal tear. * **C. Boerhaave syndrome:** This involves a **transmural perforation** (full-thickness rupture) of the esophagus, not just a mucosal tear. It is a surgical emergency presenting with the Mackler triad (vomiting, chest pain, and subcutaneous emphysema). * **D. Menetrier's disease:** A premalignant condition characterized by massive gastric mucosal folds (hypertrophic gastropathy) leading to protein loss and hypoproteinemia, not acute hematemesis from a tear. **Clinical Pearls for NEET-PG:** * **Location:** Most commonly found just below the GE junction on the lesser curvature of the stomach. * **Diagnosis:** Gold standard is **Upper GI Endoscopy (UGIE)**, which reveals longitudinal streaks of blood or a clot-covered tear. * **Management:** Most cases (approx. 80-90%) stop bleeding spontaneously with conservative management (PPIs and fluid resuscitation). Endoscopic therapy (clips or epinephrine) is reserved for active bleeders. * **Key Differentiator:** Mallory-Weiss = Mucosal tear (Benign); Boerhaave = Transmural rupture (Fatal).

Question 733: Which of the following statements about Peutz-Jeghers syndrome is incorrect?

A. Features include pigmentation of lips and oral mucosa.
B. It is characterized by polyposis, typically involving the jejunum.
C. Radiotherapy is the treatment of choice. (Correct Answer)
D. Malignancy occurs rarely in affected individuals.

Explanation: **Explanation:** Peutz-Jeghers Syndrome (PJS) is an **autosomal dominant** condition caused by a mutation in the **STK11 (LKB1)** gene on chromosome 19. It is characterized by the association of gastrointestinal hamartomatous polyps and mucocutaneous hyperpigmentation. **Why Option C is Incorrect (The Correct Answer):** Radiotherapy has no role in the management of PJS. The treatment of choice is **prophylactic screening and surgical/endoscopic intervention**. Large or symptomatic polyps are managed via **"clean-sweep" enteroscopy** or surgery to prevent complications like intussusception or bleeding. **Analysis of Other Options:** * **Option A:** Melanin pigmentation (lentigines) on the lips, perioral area, and buccal mucosa is a hallmark diagnostic feature, often appearing in infancy. * **Option B:** While polyps can occur anywhere in the GI tract, the **small intestine (specifically the jejunum)** is the most common site, followed by the colon and stomach. * **Option D:** This statement is technically **controversial but often used in older MCQ formats** to contrast with FAP. However, modern medicine recognizes that PJS carries a significantly increased lifetime risk (up to 93%) of both GI and extra-intestinal malignancies (breast, pancreas, ovary). In the context of this specific question, "Radiotherapy" is the most glaringly false statement. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant; Gene: **STK11**. * **Polyp Type:** Hamartomatous (characterized by a "Christmas tree" branching pattern of smooth muscle). * **Most common complication:** Intussusception (often leading to "lead point" obstruction). * **Cancer Risks:** Highest for Breast and Pancreatic cancer (extra-intestinal). * **Monitoring:** Regular upper GI endoscopy, colonoscopy, and capsule endoscopy are recommended starting in late childhood.

Question 734: A 1 cm x 1 cm squamous cell carcinoma of the anal canal is best treated initially by?

A. Abdominoperineal resection
B. Localized resection followed by irradiation
C. Proximal colostomy followed by interstitial irradiation
D. Chemo-radiotherapy (Correct Answer)

Explanation: **Explanation:** The primary management of **Squamous Cell Carcinoma (SCC) of the anal canal** has shifted from radical surgery to organ-preserving therapy. The current gold standard is the **Nigro Protocol**, which consists of definitive **Chemo-radiotherapy (CRT)**. 1. **Why Chemo-radiotherapy is correct:** Unlike most GI tract cancers, anal canal SCC is highly radiosensitive and chemosensitive. CRT (typically using 5-Fluorouracil and Mitomycin-C) achieves high cure rates (80-90%) while preserving the anal sphincter and avoiding a permanent stoma. This remains the treatment of choice regardless of the tumor size (even for small 1 cm lesions). 2. **Why other options are incorrect:** * **Abdominoperineal Resection (APR):** Once the standard, it is now reserved only for **salvage therapy** (recurrent or persistent disease) or for patients who cannot tolerate radiation. It involves a permanent colostomy. * **Localized Resection:** This is only considered for **Anal Margin** tumors (well-differentiated, <2cm, T1), not for tumors of the **Anal Canal**. * **Proximal Colostomy:** This is not a primary treatment but a palliative or supportive measure if there is complete bowel obstruction or severe incontinence. **High-Yield Clinical Pearls for NEET-PG:** * **Anal Canal vs. Anal Margin:** Anal canal tumors (above the verge) require CRT. Anal margin tumors (below the verge) can be treated like skin SCC (local excision if small). * **Nigro Protocol Drugs:** 5-FU + Mitomycin C + Radiation. * **Most common risk factor:** Human Papillomavirus (HPV) types 16 and 18. * **Lymphatic Drainage:** Above the pectinate line (Internal iliac nodes); Below the pectinate line (Superficial inguinal nodes).

Question 735: Which of the following statements is true regarding the treatment of achalasia?

A. Calcium channel blockers are effective in only 10% of patients. (Correct Answer)
B. Endoscopic botulinum toxin injection is the procedure of choice.
C. Heller's myotomy without partial fundoplication is the surgery of choice.
D. Heller's myotomy with partial fundoplication is a curative treatment.

Explanation: **Explanation:** **Achalasia Cardia** is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of esophageal peristalsis. **1. Why Option A is Correct:** Pharmacotherapy is the least effective treatment modality for achalasia. **Calcium channel blockers (e.g., Nifedipine)** and nitrates are used to relax the LES, but they are reserved for patients who are unfit for surgery or pneumatic dilation. Their efficacy is poor, with significant symptom relief seen in only about **10% of patients**, and their effect often diminishes over time (tachyphylaxis). **2. Why Incorrect Options are Wrong:** * **Option B:** While **Botulinum toxin injection** is effective initially, its effects are transient (lasting 6–12 months). It is not the "procedure of choice" but rather an alternative for elderly patients or those with significant comorbidities. * **Option C:** **Heller’s myotomy** involves incising the muscular layers of the LES. If performed alone, it leads to severe gastroesophageal reflux (GERD). Therefore, it must always be accompanied by a **partial fundoplication** (Dor or Toupet) to prevent reflux. * **Option D:** Achalasia is a chronic, progressive condition. While Heller’s myotomy is the surgical gold standard and provides excellent symptomatic relief, it is **palliative, not curative**, as it does not restore normal peristalsis to the esophageal body. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Bird’s Beak Appearance:** Seen on Barium Swallow. * **Pneumatic Dilation:** The most effective non-surgical treatment (risk of perforation ~1-3%). * **POEM (Peroral Endoscopic Myotomy):** A newer, minimally invasive endoscopic alternative to Heller’s myotomy.

Question 736: A 61-year-old woman presents with nausea, vomiting, and sudden onset of left-sided abdominal pain. Physical examination shows low-grade fever, and laboratory evaluation shows increased neutrophils in her peripheral blood. Which of the following is the most likely diagnosis?

A. Appendicitis
B. Colitis
C. Diverticulitis (Correct Answer)
D. Pancreatitis

Explanation: **Explanation:** The clinical presentation of sudden-onset **left-sided abdominal pain**, fever, and leukocytosis (increased neutrophils) in an older patient is the classic triad for **Acute Diverticulitis**. Often referred to as "Left-sided Appendicitis," it occurs when a micro or macro-perforation develops in a diverticulum, typically in the sigmoid colon. **Why the correct answer is right:** * **Location:** The sigmoid colon is the most common site for diverticula; hence, pain is localized to the Left Lower Quadrant (LLQ). * **Demographics:** It primarily affects older adults (age >60). * **Systemic Signs:** Fever and neutrophilia indicate an underlying inflammatory or infectious process, consistent with diverticular inflammation. **Why the other options are incorrect:** * **Appendicitis:** Typically presents with periumbilical pain migrating to the **Right Lower Quadrant (RLQ)**. While "situs inversus" or a long pelvic appendix can cause left-sided pain, it is statistically much less likely in a 61-year-old. * **Colitis:** Usually presents with diarrhea (often bloody), diffuse cramping, and tenesmus rather than sudden, localized surgical pain. * **Pancreatitis:** Characterized by epigastric pain radiating to the **back**, often associated with heavy alcohol use or gallstones. While it causes nausea/vomiting, the localization to the left lower abdomen is atypical. **NEET-PG High-Yield Pearls:** * **Investigation of Choice:** Contrast-Enhanced CT (CECT) of the abdomen (shows bowel wall thickening and pericolic fat stranding). * **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 perforated diverticulitis. * **Management:** Uncomplicated cases are managed with bowel rest and antibiotics; complicated cases (abscess/perforation) may require drainage or a **Hartmann’s Procedure**.

Question 737: What is the most common site of intestinal obstruction in gallstone ileus?

A. Duodenum
B. Jejunum
C. Ileum (Correct Answer)
D. Sigmoid colon

Explanation: **Explanation:** **Gallstone ileus** is a mechanical small bowel obstruction caused by the impaction of a large gallstone (usually >2.5 cm) that has entered the gastrointestinal tract through a biliary-enteric fistula (most commonly cholecystoduodenal). **Why Ileum is the Correct Answer:** The **terminal ileum** is the most common site of obstruction (60–75% of cases). This is due to two primary anatomical reasons: 1. **Luminal Narrowing:** The ileum is the narrowest part of the small intestine. 2. **Peristaltic Activity:** The ileocecal valve acts as a physiological barrier, and the distal ileum has relatively weaker peristaltic strength compared to the proximal segments, making it the most likely "bottleneck" for a migrating stone. **Analysis of Incorrect Options:** * **Duodenum:** While the stone often enters here via the fistula, the lumen is wide enough to allow passage. Obstruction here is rare and is specifically known as **Bouveret syndrome**. * **Jejunum:** The jejunal lumen is wider than the ileum; obstruction only occurs here in about 15% of cases. * **Sigmoid Colon:** This is a rare site of obstruction, occurring only if there is a pre-existing colonic stricture or diverticular disease. **NEET-PG High-Yield Pearls:** * **Rigler’s Triad (Pathognomonic on X-ray):** 1. Pneumobilia (air in biliary tree), 2. Small bowel obstruction, 3. Ectopic gallstone (usually in the right iliac fossa). * **Most common fistula:** Cholecystoduodenal fistula. * **Treatment:** Enterolithotomy (proximal to the site of obstruction) is the primary emergency procedure. Concurrent cholecystectomy is usually deferred in unstable patients.

Question 738: Which among the following conditions is not considered pre-malignant?

A. Ulcerative colitis
B. Peutz-jeghers syndrome (Correct Answer)
C. Villous adenoma
D. Familial adenomatous polyposis

Explanation: **Explanation:** The core concept in this question lies in distinguishing between **neoplastic (adenomatous)** polyps and **non-neoplastic (hamartomatous)** polyps. **Why Peutz-Jeghers Syndrome (PJS) is the correct answer:** PJS is characterized by multiple **hamartomatous polyps** throughout the gastrointestinal tract. Hamartomas are benign overgrowths of native tissue and are **not inherently pre-malignant** (i.e., the polyp itself does not transform into cancer). While patients with PJS have a significantly increased lifetime risk of developing various cancers (colorectal, pancreatic, breast, and ovarian) due to the *STK11* gene mutation, the polyps themselves are considered non-neoplastic. **Analysis of Incorrect Options:** * **Ulcerative Colitis:** Chronic inflammation leads to mucosal dysplasia. The risk of colorectal carcinoma increases with the duration and extent of the disease (pancolitis). * **Villous Adenoma:** These are neoplastic epithelial polyps. Among adenomas, the "villous" architecture carries the highest risk of malignant transformation (up to 40%) compared to tubular adenomas. * **Familial Adenomatous Polyposis (FAP):** Caused by a mutation in the *APC* gene, it results in hundreds to thousands of adenomatous polyps. Without a prophylactic colectomy, the risk of progression to colorectal cancer is nearly 100% by age 40. **High-Yield Clinical Pearls for NEET-PG:** * **PJS Triad:** Mucocutaneous pigmentation (melanotic spots on lips/buccal mucosa), GI hamartomatous polyps, and autosomal dominant inheritance (*STK11/LKB1* mutation). * **Most common site for PJS polyps:** Small intestine (Jejunum). * **Most common complication of PJS polyps:** Intussusception. * **Malignancy Risk:** While the polyps are benign, the overall relative risk of GI malignancy in PJS is ~15 times higher than the general population.

Question 739: A 45-year-old man presents with long-standing heartburn and dyspepsia. An X-ray film of the chest shows a retrocardiac, gas-filled structure. This patient most likely has which of the following conditions?

A. Boerhaave syndrome
B. Esophageal varices
C. Esophageal webs
D. Hiatal hernia (Correct Answer)

Explanation: ### Explanation **Correct Option: D. Hiatal Hernia** The clinical presentation of long-standing heartburn and dyspepsia suggests **Gastroesophageal Reflux Disease (GERD)**. The pathognomonic radiological finding of a **retrocardiac, gas-filled structure** on a chest X-ray indicates that a portion of the stomach has herniated through the esophageal hiatus into the posterior mediastinum. In a sliding hiatal hernia (the most common type), the gastroesophageal junction moves above the diaphragm, predisposing the patient to reflux. **Incorrect Options:** * **A. Boerhaave Syndrome:** This is a spontaneous transmural esophageal perforation. X-ray typically shows pneumomediastinum, pleural effusion, or "V sign of Naclerio," not a structured gas-filled organ. It is an acute surgical emergency, unlike this chronic presentation. * **B. Esophageal Varices:** These are dilated submucosal veins due to portal hypertension. They are not visible on a plain X-ray and do not contain gas; they are diagnosed via endoscopy or barium swallow (showing "worm-like" filling defects). * **C. Esophageal Webs:** These are thin mucosal folds usually found in the upper esophagus (associated with Plummer-Vinson syndrome). They cause dysphagia but do not present as retrocardiac gas shadows. **High-Yield Clinical Pearls for NEET-PG:** * **Types of Hiatal Hernia:** Type I (Sliding) is most common (95%) and associated with GERD. Type II-IV (Paraesophageal) involve the gastric fundus herniating alongside the esophagus; these carry a higher risk of **volvulus and strangulation**. * **Cameron Ulcers:** Linear gastric erosions found within a hiatal hernia sac due to mechanical trauma; they can cause chronic iron deficiency anemia. * **Differential Diagnosis:** A retrocardiac shadow can also be an **Achalasia Cardia** (dilated esophagus with an air-fluid level) or a **Morgagni Hernia** (usually right-sided anterior diaphragmatic defect).

Question 740: What is the most common tumor of the appendix?

A. Carcinoid tumor (Correct Answer)
B. Pseudomyxoma peritonitis
C. Adenocarcinoma
D. Mucocele

Explanation: ### Explanation **Correct Answer: A. Carcinoid tumor** **Why it is correct:** Carcinoid tumors (Neuroendocrine tumors) are the most common primary neoplasms of the appendix, accounting for approximately 50–85% of all appendiceal tumors. They are usually found incidentally during an appendectomy (incidence: 0.3–0.9% of all specimens). Most are located at the **tip of the appendix**, are less than 1 cm in size, and rarely metastasize. **Why the other options are incorrect:** * **B. Pseudomyxoma peritonei:** This is a clinical condition (not a primary tumor type) characterized by the accumulation of gelatinous "jelly-like" ascites in the peritoneal cavity. It most commonly results from the rupture of a low-grade appendiceal mucinous neoplasm (LAMN). * **C. Adenocarcinoma:** This is a rare primary malignancy of the appendix (less common than carcinoids). It typically presents similarly to acute appendicitis but in an older age group and often requires a right hemicolectomy. * **D. Mucocele:** This is a descriptive clinical term for a dilated appendix filled with mucus. It can be caused by benign (fecalith, mucus hyperplasia) or malignant (cystadenocarcinoma) processes; it is not a specific histological tumor type. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Most carcinoids occur at the **tip** (distal 1/3), where they are unlikely to cause obstruction. * **Size & Management:** * < 1 cm: Simple appendectomy is sufficient. * 1–2 cm: Appendectomy is usually enough unless there is mesoappendiceal invasion or high mitotic rate. * \> 2 cm: Requires **Right Hemicolectomy**. * **Carcinoid Syndrome:** Extremely rare in appendiceal carcinoids unless there are extensive liver metastases. * **Stain:** Chromogranin A and Synaptophysin are the most common immunohistochemical markers.

Practice by Chapter

Esophageal Disorders

Practice Questions

Gastric Disorders

Practice Questions

Small Intestine Pathology

Practice Questions

Appendicitis

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Intestinal Obstruction

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Diverticular Disease

Practice Questions

Anorectal Disorders

Practice Questions

Colorectal Neoplasms

Practice Questions

Gastrointestinal Stomas

Practice Questions

Bariatric Surgery Principles

Practice Questions

Want unlimited practice?

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

Start For Free