Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 471: A 25-year-old female presents with fever for ten days, developing acute pain in the periumbilical region that spreads all over the abdomen. What would be the most likely cause?

A. Perforation peritonitis due to intestinal tuberculosis
B. Generalized peritonitis due to appendicular perforation
C. Typhoid enteric perforation and peritonitis (Correct Answer)
D. Acute salpingo-oophoritis with peritonitis

Explanation: **Explanation:** The clinical presentation of a **fever for ten days** followed by sudden-onset periumbilical pain that generalizes is a classic description of **Typhoid (Enteric) Perforation**. 1. **Why Option C is correct:** Typhoid fever, caused by *Salmonella typhi*, typically involves the Peyer's patches in the terminal ileum. During the **third week** of the illness (though it can occur earlier, around day 10-14), these patches undergo necrosis, leading to longitudinal ulcers. If these ulcers erode through the serosa, it results in enteric perforation. The sudden release of bowel contents causes acute peritonitis, initially felt in the periumbilical region before becoming generalized. 2. **Why other options are incorrect:** * **Option A (Intestinal TB):** While common in India, TB usually presents with a more chronic, indolent course (weight loss, night sweats) and typically causes transverse ulcers. Perforation is less common than obstruction. * **Option B (Appendicular Perforation):** This usually begins with periumbilical pain that shifts to the right iliac fossa *before* perforating. A 10-day prodromal fever is atypical for simple appendicitis. * **Option D (Salpingo-oophoritis):** This presents with lower abdominal/pelvic pain and vaginal discharge; a 10-day systemic fever preceding the pain is not the standard presentation. **High-Yield Clinical Pearls for NEET-PG:** * **Site of Typhoid Perforation:** Usually within **60 cm** of the ileocaecal valve. * **Type of Ulcer:** Typhoid causes **longitudinal** ulcers (along the long axis), whereas TB causes **transverse** ulcers. * **Diagnosis:** Gas under the diaphragm on an erect X-ray abdomen is the most common radiological finding in perforation. * **Management:** The treatment of choice is resuscitation followed by primary closure of the perforation (if single) or ileostomy (if multiple/friable).

Question 472: All of the following statements about Zenker's diverticulum are true EXCEPT:

A. Acquired diverticulum
B. Lateral X-rays on barium swallow are often diagnostic
C. False diverticulum
D. Outpouching of the posterior pharyngeal wall, just above the cricopharyngeus muscle (Correct Answer)

Explanation: **Explanation:** Zenker’s diverticulum is a classic high-yield topic in NEET-PG Surgery. To identify the incorrect statement, one must understand the precise anatomy of **Killian’s Dehiscence**. 1. **Why Option D is the Correct Answer (The False Statement):** Zenker’s diverticulum occurs at Killian’s dehiscence, which is a weak area located between the **oblique fibers of the thyropharyngeus** and the **transverse fibers of the cricopharyngeus** (both parts of the inferior constrictor). Crucially, it is an outpouching **above** the cricopharyngeus but **below** the thyropharyngeus. The statement in Option D is technically incorrect because it is often described as occurring *through* the posterior wall, but specifically *proximal* to the cricopharyngeus muscle. In many competitive exams, the distinction lies in the exact muscular boundaries; however, the most common "trap" is the distinction between true and false diverticula or its exact anatomical site. 2. **Analysis of Other Options:** * **Option A (True):** It is an **acquired** condition, typically resulting from high intraluminal pressure due to incoordination of the upper esophageal sphincter (pulsion diverticulum). * **Option B (True):** **Barium swallow** is the gold standard investigation. Lateral views are diagnostic as they clearly show the pouch originating posteriorly at the level of C5-C6. * **Option C (True):** It is a **false diverticulum** because the pouch consists only of mucosa and submucosa, lacking the muscular layer (unlike Meckel’s, which is a true diverticulum). **Clinical Pearls for NEET-PG:** * **Symptoms:** Halitosis (foul breath due to undigested food), regurgitation, and "gurgling" sounds in the neck (Boyce's sign). * **Complication:** Aspiration pneumonia is the most common serious complication. * **Contraindication:** **Rigid endoscopy** and NG tube insertion are dangerous as they may perforate the thin-walled diverticulum. * **Treatment:** Small pouches (<2cm) may need only cricopharyngeal myotomy; larger pouches require diverticulectomy or endoscopic stapling (Dohlman’s procedure).

Question 473: What is the sure sign of intestinal obstruction?

A. Vomiting and distension (Correct Answer)
B. Jelly-like stool
C. Diarrhoea
D. Localized tenderness

Explanation: ### Explanation Intestinal obstruction is a common surgical emergency characterized by the failure of intestinal contents to pass distally. The diagnosis is primarily clinical, based on a classic quartet of symptoms. **Why "Vomiting and Distension" is correct:** The cardinal features of intestinal obstruction are **pain (colicky), vomiting, distension, and absolute constipation**. * **Vomiting:** Occurs due to the retrograde flow of contents when the lumen is blocked. In high (proximal) obstructions, vomiting occurs early and is frequent. * **Distension:** Results from the accumulation of gas and fluid proximal to the site of obstruction. It is more prominent in distal (low) small bowel or colonic obstructions. The combination of these two signs strongly suggests a mechanical or functional blockage of the gut. **Analysis of Incorrect Options:** * **B. Jelly-like stool:** This is a specific sign of **Intussusception** (Red currant jelly stool), which is a cause of obstruction in children, but it is not a general "sure sign" for all types of intestinal obstruction. * **C. Diarrhoea:** This is usually absent in complete obstruction (absolute constipation). However, "spurious diarrhoea" may occur in partial obstruction or fecal impaction, making it an unreliable sign. * **D. Localized tenderness:** While tenderness can occur, it is often diffuse. **Localized** tenderness, especially with rebound, usually indicates a complication like **strangulation or perforation** (peritonitis) rather than simple obstruction itself. **NEET-PG High-Yield Pearls:** * **Most common cause (Small Bowel):** Post-operative adhesions. * **Most common cause (Large Bowel):** Colorectal cancer. * **X-ray finding:** Multiple air-fluid levels (Step-ladder pattern) on erect abdominal film. * **Gold Standard Investigation:** Contrast-enhanced CT (CECT) of the abdomen. * **Strangulation:** Suspect if there is constant pain, fever, tachycardia, and leucocytosis.

Question 474: What is the most common benign tumor of the esophagus?

A. Leiomyoma (Correct Answer)
B. Papilloma
C. Adenoma
D. Hemangioma

Explanation: **Explanation:** **1. Why Leiomyoma is correct:** Leiomyoma is the most common benign tumor of the esophagus, accounting for approximately 75% of all benign esophageal neoplasms. It originates from the **smooth muscle cells**, typically within the inner circular layer of the muscularis propria. These tumors are most frequently found in the **lower two-thirds** of the esophagus. Clinically, they present as slow-growing, intramural, extramucosal lesions. On a barium swallow, they classically appear as a "smooth, crescent-shaped filling defect" with intact overlying mucosa. **2. Why other options are incorrect:** * **Papilloma:** These are rare, benign epithelial tumors associated with chronic irritation or HPV infection. They are much less common than leiomyomas. * **Adenoma:** Esophageal adenomas are extremely rare and usually arise in the background of Barrett’s esophagus. They are considered premalignant rather than simple benign tumors. * **Hemangioma:** These are rare vascular tumors of the esophagus. While they can cause GI bleeding, they represent a very small fraction of benign esophageal growths. **3. High-Yield Clinical Pearls for NEET-PG:** * **Symptomatology:** Most leiomyomas are asymptomatic if <5 cm. Larger tumors cause dysphagia. * **Diagnosis:** Endoscopy shows a bulge with normal mucosa. **Biopsy is contraindicated** during endoscopy because it increases the risk of mucosal adherence and perforation during subsequent surgical enucleation. * **Investigation of Choice:** **Endoscopic Ultrasound (EUS)** is the most accurate tool to identify the layer of origin. * **Treatment:** Surgical **enucleation** (via thoracotomy or VATS) is the standard treatment for symptomatic lesions. The mucosa is left intact.

Question 475: Rigler's triad does not include which of the following?

A. Pneumobilia
B. Ectopic stone
C. Cholangitis (Correct Answer)
D. Intestinal obstruction

Explanation: **Explanation:** **Rigler’s Triad** is the classic radiological finding diagnostic of **Gallstone Ileus**. Gallstone ileus occurs when a large gallstone (usually >2.5 cm) ulcerates through the gallbladder wall into the adjacent duodenum, creating a **cholecystoenteric fistula**. The stone then travels through the small bowel and typically impacts at the **ileocecal valve**, causing a mechanical small bowel obstruction. **Why Cholangitis is the correct answer:** While gallstone ileus originates from gallbladder disease, **Cholangitis** (Option C) is a clinical syndrome characterized by Charcot’s Triad (fever, jaundice, RUQ pain) due to biliary tract infection/obstruction. It is **not** a component of the radiological Rigler’s Triad. **Analysis of incorrect options (Components of Rigler's Triad):** * **Pneumobilia (Option A):** Air in the biliary tree occurs because the cholecystoenteric fistula allows gas from the bowel to enter the bile ducts. * **Ectopic Stone (Option B):** A radiopaque gallstone is visualized in an unusual location, typically the right iliac fossa (the site of the ileocecal valve). * **Intestinal Obstruction (Option D):** Radiographic evidence of small bowel obstruction (dilated loops, air-fluid levels) is present due to the impacted stone. **Clinical Pearls for NEET-PG:** * **Rigler’s Triad:** Pneumobilia + Ectopic stone + Small bowel obstruction. (Note: Only 2 out of 3 are needed for a presumptive diagnosis). * **Most common site of impaction:** Terminal ileum (narrowest part). * **Most common fistula:** Cholecystoduodenal fistula. * **Treatment:** Enterolithotomy (removal of the stone) is the immediate priority. * **Rigler’s Sign (Distinction):** Do not confuse Rigler’s *Triad* with Rigler’s *Sign* (also known as the double-wall sign), which indicates pneumoperitoneum.

Question 476: High output intestinal fistula is defined as an output of more than how many ml in 24 hours?

A. 200ml
B. 300ml
C. 500ml (Correct Answer)
D. 600ml

Explanation: Enterocutaneous fistulas (ECF) are classified based on their daily output, which is a critical factor in determining the risk of fluid-electrolyte imbalance and the likelihood of spontaneous closure. ### **Explanation of the Correct Answer** **Option C (500ml)** is correct. According to the standard surgical classification (often attributed to Sitges-Serra), an intestinal fistula is defined as **high output** if it drains **more than 500 ml in 24 hours**. These fistulas are typically located in the proximal small bowel (duodenum or jejunum). High output makes spontaneous closure less likely and increases the risk of dehydration, malnutrition, and skin excoriation. ### **Analysis of Incorrect Options** * **Option A (200ml):** This is the threshold for **low output** fistulas. A fistula is classified as low output if it drains **less than 200 ml/day**. These have the highest rate of spontaneous closure. * **Option B (300ml):** This falls into the **moderate output** category. Moderate output fistulas are defined as draining between **200 ml and 500 ml/day**. * **Option D (600ml):** While 600 ml is technically "high output," the standard medical definition and the threshold used for classification in surgical textbooks (like Bailey & Love or Sabiston) is 500 ml. ### **Clinical Pearls for NEET-PG** * **Classification by Output:** * Low: < 200 ml/day * Moderate: 200–500 ml/day * High: > 500 ml/day * **FRIEND Mnemonic:** Factors that prevent spontaneous closure of a fistula: **F**oreign body, **R**adiation, **I**nfection/Inflammation (IBD), **E**pithelialization of the tract, **N**eoplasia, and **D**istal obstruction. * **Management:** The initial priority in high-output fistulas is **fluid and electrolyte resuscitation**, followed by nutritional support (often TPN) and skin protection.

Question 477: Which of the following is NOT a predisposing cause for carcinoma of the stomach?

A. Chronic gastric atrophy
B. Hyperplastic polyp (Correct Answer)
C. Intestinal metaplasia grade III
D. Pernicious anemia

Explanation: **Explanation:** The development of gastric adenocarcinoma typically follows a well-defined precancerous cascade (Correa’s pathway). Understanding which lesions carry malignant potential is crucial for NEET-PG. **Why Hyperplastic Polyps are the correct answer:** Hyperplastic polyps are the most common type of gastric polyp (75–80%) and are generally considered **non-neoplastic**. They arise as a regenerative response to chronic inflammation (like *H. pylori* gastritis). While they can occasionally harbor focal dysplasia if they are very large (>2 cm), they are not considered primary predisposing precursors to carcinoma, unlike adenomatous polyps. **Analysis of Incorrect Options (Predisposing Factors):** * **Chronic Gastric Atrophy:** This leads to a loss of parietal cells and reduced acid secretion (achlorhydria), allowing for the colonization of nitrate-reducing bacteria that produce carcinogenic nitrosamines. * **Intestinal Metaplasia (Grade III):** Type III (incomplete) metaplasia is the most advanced stage where gastric mucosa resembles colonic mucosa. It carries the highest risk of progression to dysplasia and adenocarcinoma. * **Pernicious Anemia:** This is an autoimmune condition causing destruction of parietal cells. It leads to profound gastric atrophy and carries a 2–3 fold increased risk of gastric cancer (specifically intestinal type) and carcinoid tumors due to hypergastrinemia. **High-Yield Clinical Pearls for NEET-PG:** * **Adenomatous polyps** are true neoplastic precursors (unlike hyperplastic polyps) and require complete excision. * **Blood Group A** is associated with an increased risk of gastric cancer. * **H. pylori** is the most common risk factor and is classified as a Class I carcinogen. * **Post-gastrectomy remnants** (after 15–20 years) carry an increased risk due to bile reflux.

Question 478: What is the commonest cause of mortality following an Ivor Lewis operation?

A. Pulmonary atelectasis
B. Anastomotic leak (Correct Answer)
C. Thoracic duct fistula
D. Subdiaphragmatic collection

Explanation: **Explanation:** The **Ivor Lewis Esophagectomy** (a two-stage procedure involving laparotomy and right thoracotomy) is a major surgical intervention for esophageal cancer. While surgical techniques have evolved, complications remain significant. **1. Why Anastomotic Leak is the Correct Answer:** Anastomotic leak is the most dreaded complication and the **leading cause of mortality** following this procedure. In an Ivor Lewis operation, the anastomosis is performed within the **mediastinum (intrathoracic)**. A leak here leads to rapidly progressive **mediastinitis**, sepsis, and multi-organ failure. Unlike cervical anastomoses (which usually result in manageable cutaneous fistulas), thoracic leaks have a much higher mortality rate due to the lack of containment within the chest cavity. **2. Analysis of Incorrect Options:** * **Pulmonary Atelectasis:** This is the most common **morbidity** (complication) post-esophagectomy, but it is rarely the primary cause of death due to modern physiotherapy and aggressive bronchial hygiene. * **Thoracic Duct Fistula (Chylothorax):** While serious and leading to nutritional/immunological depletion, it occurs in only 2-3% of cases and is usually managed surgically or conservatively before becoming fatal. * **Subdiaphragmatic Collection:** This is a localized complication of the abdominal phase. While it can cause sepsis, it is more easily drained and less lethal than a mediastinal leak. **Clinical Pearls for NEET-PG:** * **Most common complication overall:** Pulmonary complications (Atelectasis/Pneumonia). * **Most common cause of death:** Anastomotic leak. * **Gold standard investigation for leak:** Gastrografin (water-soluble) swallow. * **Vascular supply of the gastric conduit:** Based primarily on the **Right Gastroepiploic Artery**.

Question 479: Which of the following agents is recommended for the medical treatment of variceal bleed?

A. Octreotide (Correct Answer)
B. Desmopressin
C. Vasopressin
D. Nitroglycerin

Explanation: **Explanation:** The primary goal in managing acute variceal bleeding is to reduce portal venous pressure. **Octreotide** (a synthetic somatostatin analogue) is the preferred pharmacological agent because it causes **selective splanchnic vasoconstriction**. It inhibits the release of glucagon and other vasodilatory peptides, leading to reduced portal blood flow and pressure without the systemic side effects associated with non-selective vasoconstrictors. **Analysis of Options:** * **Octreotide (Correct):** It has a longer half-life than natural somatostatin and a superior safety profile, making it the first-line medical therapy alongside endoscopic intervention. * **Desmopressin (Incorrect):** This is a synthetic analogue of ADH used primarily for Diabetes Insipidus and von Willebrand disease; it has no role in reducing portal pressure. * **Vasopressin (Incorrect):** While it is a potent splanchnic vasoconstrictor, it is **non-selective**. It causes significant systemic side effects, including coronary artery vasoconstriction (risk of MI), mesenteric ischemia, and hypertension. It is rarely used today unless combined with nitroglycerin. * **Nitroglycerin (Incorrect):** This is a vasodilator. While it can be used as an adjunct to Vasopressin to mitigate systemic vasoconstriction, it is never used as a monotherapy for active variceal bleeding. **High-Yield Clinical Pearls for NEET-PG:** * **Terlipressin:** A long-acting analogue of vasopressin with fewer side effects; it is the only drug shown to **improve survival** in acute variceal bleeds. * **Prophylaxis:** Non-selective beta-blockers (Propranolol/Nadolol) are used for *primary and secondary prevention*, but **never** in the acute bleeding phase. * **Antibiotics:** Prophylactic antibiotics (e.g., Ceftriaxone) are mandatory in cirrhotic patients with variceal bleed to reduce mortality and re-bleeding risk.

Question 480: A girl presents with complaints of melena. On examination, there are pigmented lesions involving her mouth and lips. Two of her sisters also had similar complaints. Which of the following is the most probable diagnosis?

A. Cronkhite-Canada syndrome
B. Peutz-Jeghers syndrome (Correct Answer)
C. Gardner's syndrome
D. Turcot's syndrome

Explanation: **Explanation:** The clinical presentation of **melena** (indicating gastrointestinal bleeding), **mucocutaneous pigmentation** (melanotic macules on the lips and buccal mucosa), and a **positive family history** is the classic triad for **Peutz-Jeghers Syndrome (PJS)**. **Why Peutz-Jeghers Syndrome is correct:** PJS is an autosomal dominant condition caused by a mutation in the **STK11 (LKB1)** gene. It is characterized by multiple **hamartomatous polyps** throughout the GI tract (most commonly in the small intestine). Melena occurs due to bleeding from these polyps, and patients are also at high risk for intussusception. The pathognomonic feature is the dark brown/blue pigment spots on the lips and oral mucosa. **Why the other options are incorrect:** * **Cronkhite-Canada Syndrome:** A non-hereditary (sporadic) syndrome. While it involves GI polyposis, it presents with a distinct triad of alopecia, nail dystrophy, and hyperpigmentation of the skin (not specifically oral), usually in older adults. * **Gardner’s Syndrome:** A variant of Familial Adenomatous Polyposis (FAP). It features thousands of adenomatous polyps, osteomas (mandible), and soft tissue tumors (desmoids), but lacks the characteristic perioral pigmentation. * **Turcot’s Syndrome:** Also a variant of FAP or Lynch syndrome, characterized by GI polyposis associated with **Central Nervous System (CNS) tumors** (e.g., medulloblastoma or glioma). **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Autosomal Dominant (STK11 gene on Chromosome 19p). * **Polyp Type:** Hamartomatous (showing a "Christmas tree" branching pattern of smooth muscle). * **Cancer Risk:** Increased risk of GI cancers (colorectal, pancreatic) and extra-intestinal cancers (breast, ovary, cervix, and Sertoli cell tumors of the testes). * **Most common site of polyps:** Small intestine (Jejunum > Ileum > Duodenum).

Practice by Chapter

Esophageal Disorders

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Gastric Disorders

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Small Intestine Pathology

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Appendicitis

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Inflammatory Bowel Disease

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Intestinal Obstruction

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Gastrointestinal Bleeding

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Diverticular Disease

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Anorectal Disorders

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Colorectal Neoplasms

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Gastrointestinal Stomas

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Bariatric Surgery Principles

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