Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 81: A 65-year-old woman with a history of chronic constipation presents with abdominal pain and marked abdominal distention. On examination, her abdomen is distended and tender in the left lower quadrant. What is the most likely diagnosis?

A. Appendicitis
B. Carcinoma of the colon
C. Volvulus of the sigmoid colon (Correct Answer)
D. Volvulus of the cecum

Explanation: **Explanation:** The clinical presentation of a 65-year-old patient with chronic constipation, acute abdominal pain, and marked distention is classic for **Sigmoid Volvulus**. **1. Why Sigmoid Volvulus is correct:** Sigmoid volvulus involves the twisting of the sigmoid colon around its mesenteric axis. It typically occurs in elderly patients with a history of chronic constipation, which leads to a redundant, heavy, and dilated sigmoid colon—a prerequisite for torsion. The hallmark clinical features are **marked abdominal distention** (often more prominent than in other obstructions) and tenderness, frequently localized to the **left lower quadrant** where the sigmoid is situated. **2. Why the other options are incorrect:** * **Appendicitis:** Usually presents in younger patients with periumbilical pain migrating to the right iliac fossa. While it causes tenderness, it does not typically cause "marked abdominal distention" unless complicated by generalized peritonitis. * **Carcinoma of the colon:** While a common cause of obstruction in the elderly, it usually presents more subacutely with weight loss and altered bowel habits. It is a common *predisposing* factor for volvulus but is not the primary diagnosis for sudden, massive distention. * **Volvulus of the cecum:** This typically occurs in younger patients (30–50 years) due to an abnormally mobile cecum. The pain and distention are usually more prominent on the right side of the abdomen. **Clinical Pearls for NEET-PG:** * **X-ray Finding:** Look for the **"Coffee Bean sign"** or "Omega sign" (dilated sigmoid loop). * **Barium Enema:** Shows the **"Bird’s Beak"** or "Ace of Spades" appearance. * **Management:** The initial treatment of choice for stable patients is **Sigmoidoscopic detorsion** (using a flatus tube). If gangrene is suspected or detorsion fails, emergency surgery (Hartmann’s procedure) is required.

Question 82: A 56-year-old man has suffered from intermittent claudication for 5 years. He has recently developed cramping abdominal pain that is made worse by eating. He has a history of a 15-lb weight loss. What is the most likely diagnosis?

A. Chronic intestinal ischemia (intestinal angina) (Correct Answer)
B. Chronic cholecystitis
C. Esophageal diverticulum
D. Peptic ulcer

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The patient presents with the classic triad of **Chronic Intestinal Ischemia (Intestinal Angina)**: * **Postprandial abdominal pain:** Described as "cramping" and occurring shortly after eating (when the metabolic demand of the gut increases). * **Weight loss:** This is typically due to **"sitophobia"** (fear of eating) because the patient associates food with severe pain. * **Evidence of generalized atherosclerosis:** The 5-year history of intermittent claudication indicates systemic peripheral arterial disease (PAD), making mesenteric artery stenosis highly likely. **2. Why the Incorrect Options are Wrong:** * **Chronic cholecystitis:** While it causes postprandial pain, it is usually localized to the right upper quadrant and associated with fatty food intolerance, not significant systemic weight loss or generalized claudication. * **Esophageal diverticulum:** This typically presents with dysphagia, regurgitation of undigested food, and halitosis, rather than cramping abdominal pain triggered by the act of eating. * **Peptic ulcer:** Gastric ulcers cause postprandial pain, but the pain is usually burning in nature. While weight loss can occur, it does not explain the patient’s long-standing peripheral vascular disease (claudication). **3. NEET-PG High-Yield Pearls:** * **Vessels Involved:** Usually requires significant stenosis of at least **two out of the three** major visceral arteries (Celiac trunk, SMA, and IMA) due to extensive collateral circulation. * **Diagnosis:** The gold standard for diagnosis is **CT Angiography**. * **Management:** Revascularization (Endovascular stenting or surgical bypass) is the treatment of choice. * **Clinical Sign:** An abdominal bruit may be heard in approximately 50% of patients.

Question 83: Recurrent rectal prolapse in elderly patients is typically treated by which of the following surgical procedures?

A. Thiersch wiring (Correct Answer)
B. Digital reposition
C. Excision
D. Ripstein's operation

Explanation: **Explanation:** The management of rectal prolapse (procidentia) is primarily surgical and is categorized into **Abdominal** and **Perineal** approaches. **1. Why Thiersch Wiring is Correct:** In **elderly, frail, or high-risk patients** who cannot tolerate major abdominal surgery under general anesthesia, **Thiersch wiring** (anocutaneous encircling) is the preferred palliative procedure. It involves placing a prosthetic material (traditionally silver wire, now often nylon or silicone) subcutaneously around the anus to narrow the orifice and provide mechanical support. It is performed under local anesthesia and aims to prevent the prolapse from descending, although it does not fix the underlying anatomical defect. **2. Why the other options are incorrect:** * **Digital reposition:** This is a temporary bedside maneuver to reduce the prolapse but does not treat the recurrence or the underlying pathology. * **Excision:** While perineal resections (like Altemeier’s or Delorme’s procedure) are used for prolapse, simple "excision" is not a standard term for these complex reconstructive surgeries. * **Ripstein’s operation:** This is an **abdominal rectopexy** involving the use of a T-shaped mesh to fix the rectum to the sacral promontory. While it has a lower recurrence rate, it is a major surgery requiring general anesthesia, making it unsuitable for the "elderly/frail" demographic typically associated with Thiersch wiring in exam questions. **Clinical Pearls for NEET-PG:** * **Gold Standard:** Abdominal Rectopexy (e.g., Wells or Ripstein) is the treatment of choice for fit patients due to low recurrence rates. * **Delorme’s Procedure:** A perineal approach involving mucosal proctectomy; preferred for short-segment prolapse in patients unfit for abdominal surgery. * **Altemeier’s Procedure:** Perineal proctosigmoidectomy; preferred for incarcerated or gangrenous prolapse. * **Thiersch Wiring Complication:** The most common complication is **fecal impaction** due to the narrowed anal outlet.

Question 84: Which of the following is false regarding Pseudomyxoma peritonei?

A. Recurrence is common after surgery.
B. It is refractory to most drugs. (Correct Answer)
C. Hyperthermic intraperitoneal chemotherapy is a treatment option.
D. It is most commonly associated with appendiceal tumors.

Explanation: **Explanation:** Pseudomyxoma Peritonei (PMP) is a clinical syndrome characterized by the progressive accumulation of mucinous ascites ("jelly belly") due to the implantation of mucin-producing cells on the peritoneal surfaces. **Why Option B is the correct (False) statement:** The statement that PMP is "refractory to most drugs" is considered false in the context of modern surgical oncology. While PMP is relatively resistant to standard systemic chemotherapy, it is **highly responsive to intraperitoneal chemotherapy** (such as Mitomycin C or Oxaliplatin). Because the disease remains confined to the peritoneal cavity and rarely metastasizes systemically, direct delivery of chemotherapeutic agents via **Hyperthermic Intraperitoneal Chemotherapy (HIPEC)** is an effective and standard treatment modality. **Analysis of other options:** * **Option A (True):** Recurrence is very common, even after aggressive Cytoreductive Surgery (CRS). Patients often require multiple re-operations over their lifetime. * **Option C (True):** The current "Gold Standard" treatment is the **Sugarbaker Procedure**, which combines aggressive CRS (peritonectomy) with HIPEC. * **Option D (True):** The most common primary site is the **appendix** (usually a Low-grade Appendiceal Mucinous Neoplasm - LAMN). Other sites include the ovary, colon, and pancreas. **NEET-PG High-Yield Pearls:** * **Redistribution Phenomenon:** Tumor cells follow the natural flow of peritoneal fluid, depositing on "static" sites (greater omentum, undersurface of the diaphragm) while sparing "mobile" sites (small bowel). * **Clinical Presentation:** Often presents as increasing abdominal girth or an "incidental" finding during inguinal hernia repair. * **Pathology:** Characterized by "Starry Sky" appearance on imaging or histology in some mucinous variants.

Question 85: Gallstone causes intestinal obstruction when it gets impacted in which part of the intestine commonly?

A. Proximal ileum
B. Distal ileum (Correct Answer)
C. Duodenum
D. Jejunum

Explanation: **Explanation:** The correct answer is **Distal ileum**. This condition is known as **Gallstone Ileus**, a mechanical intestinal obstruction caused by the impaction of a large gallstone in the gastrointestinal tract. **Why Distal Ileum?** Gallstone ileus typically occurs when a large stone (usually >2.5 cm) erodes through the gallbladder wall into the adjacent bowel (most commonly the duodenum) via a **cholecystoenteric fistula**. The stone travels distally through the small intestine. The **distal ileum** is the most common site of impaction because it is the narrowest part of the small bowel and has relatively weaker peristaltic activity compared to the proximal segments. The ileocecal valve further acts as a barrier, preventing the stone from entering the colon. **Analysis of Incorrect Options:** * **Proximal Ileum & Jejunum:** While the stone passes through these segments, they have a larger luminal diameter than the distal ileum, making impaction less likely unless the stone is exceptionally large or there is pre-existing stricture. * **Duodenum:** Impaction in the duodenum is rare and leads to a specific clinical entity called **Bouveret Syndrome**, which presents as gastric outlet obstruction rather than typical intestinal obstruction. **High-Yield Clinical Pearls for NEET-PG:** * **Rigler’s Triad (Radiological hallmark):** 1. Pneumobilia (air in the biliary tree), 2. Small bowel obstruction, 3. Ectopic gallstone (usually in the right iliac fossa). * **Most common fistula:** Cholecystoduodenal fistula. * **Patient Profile:** Typically an elderly female with a history of chronic cholecystitis. * **Treatment:** The priority is relieving the obstruction via **enterolithotomy** (proximal to the site of impaction). Cholecystectomy and fistula repair are often deferred to a later stage.

Question 86: Which of the following is an exception to Courvoisier's law?

A. Cancer of the ampulla
B. Cancer of the pancreas
C. Cancer of the bile duct
D. Primary oriental cholangiohepatitis causing stones in the CBD (Correct Answer)

Explanation: ### Explanation **Courvoisier’s Law** states that in a patient with obstructive jaundice, if the gallbladder is palpable, the obstruction is unlikely to be due to a stone. This is because stones cause chronic inflammation and fibrosis, making the gallbladder shrunken and non-distensible. Conversely, a palpable gallbladder suggests a malignant obstruction (distal to the cystic duct) where the gallbladder is healthy and can distend. #### Why Option D is Correct **Primary Oriental Cholangiohepatitis (Recurrent Pyogenic Cholangitis)** is a notable exception. In this condition, stones form primarily within the bile ducts (de novo) rather than migrating from the gallbladder. Because the gallbladder has not suffered from chronic cholecystitis or stone-induced fibrosis, it remains thin-walled and distensible. If a stone obstructs the common bile duct (CBD) in these patients, the gallbladder can distend and become palpable, mimicking a malignancy. #### Why Other Options are Incorrect * **Options A, B, and C (Periampullary Malignancies):** Cancer of the ampulla, head of the pancreas, and the distal bile duct are classic examples that **follow** Courvoisier’s Law. These cause gradual, progressive obstruction of the CBD. Since the gallbladder is typically normal/healthy in these patients, it distends due to backpressure, resulting in a palpable, non-tender mass. #### High-Yield Clinical Pearls for NEET-PG * **Other Exceptions to Courvoisier’s Law:** 1. **Double Impaction:** A stone in the cystic duct (causing mucocele) and another in the CBD (causing jaundice). 2. **Mucocele of the gallbladder** with a stone in the CBD. 3. **Pancreatic Calculi** obstructing the CBD. * **Terrier’s Sign:** The actual physical finding of a palpable, non-tender gallbladder in a jaundiced patient. * **Key Distinction:** If the gallbladder is palpable and **tender**, it usually indicates acute cholecystitis (not Courvoisier’s Law).

Question 87: What is the investigation of choice for esophageal rupture?

A. CT chest (Correct Answer)
B. Rigid esophagoscopy
C. Barium contrast swallow
D. Plain X-ray

Explanation: **Explanation:** The investigation of choice for esophageal rupture (Boerhaave syndrome) is **CT chest with oral contrast**. 1. **Why CT Chest is Correct:** CT scan is highly sensitive and specific. It not only identifies the site of perforation (via extravasation of oral contrast) but also detects associated complications such as pneumomediastinum, pleural effusion, and mediastinal abscess. In modern practice, it has surpassed contrast swallow as the initial investigation of choice because it provides a comprehensive assessment of the surrounding anatomy, which is crucial for surgical planning. 2. **Why other options are incorrect:** * **Rigid esophagoscopy:** This is contraindicated in suspected perforation as the insufflation of air can worsen the pneumomediastinum and expand the rupture. * **Barium contrast swallow:** While historically important, barium is highly irritating to the mediastinum and can cause **fibrosing mediastinitis**. If a swallow study is performed, **Gastrografin (water-soluble contrast)** is used first. Barium is only used if Gastrografin fails to show a leak despite high clinical suspicion. * **Plain X-ray:** While it may show indirect signs like the "V sign of Naclerio" or pneumomediastinum, it cannot definitively diagnose or localize the rupture. **Clinical Pearls for NEET-PG:** * **Boerhaave Syndrome:** Spontaneous transmural rupture usually occurring in the **left posterolateral aspect** of the distal esophagus (2-3 cm above the diaphragm). * **Mackler’s Triad:** Vomiting, chest pain, and subcutaneous emphysema. * **Gold Standard for Diagnosis:** Contrast esophagography (using Gastrografin). * **Investigation of Choice:** CT Chest with oral contrast. * **Management:** If diagnosed within 24 hours, primary surgical repair is preferred; if delayed (>24 hours), diversion or drainage may be required.

Question 88: What is the best treatment for esophageal carcinoma in situ?

A. Endoscopic mucosal resection (Correct Answer)
B. Thoracic esophagectomy
C. Transhiatal esophagectomy
D. Photodynamic therapy

Explanation: ### Explanation **Correct Answer: A. Endoscopic mucosal resection (EMR)** **Why it is correct:** Esophageal carcinoma in situ (Tis) is defined by malignant cells confined to the epithelium without invasion into the lamina propria. Since there is a **0% risk of lymph node metastasis** at this stage, radical surgical resection (esophagectomy) is unnecessary. **Endoscopic Mucosal Resection (EMR)** or Endoscopic Submucosal Dissection (ESD) is the treatment of choice because it is organ-preserving, carries significantly lower morbidity than surgery, and allows for a complete histopathological assessment of the resected specimen to confirm the depth of invasion. **Why the other options are incorrect:** * **B & C (Thoracic/Transhiatal Esophagectomy):** These are major surgical procedures involving the removal of the esophagus and regional lymphadenectomy. While curative, they are considered "overtreatment" for carcinoma in situ due to high postoperative morbidity (pulmonary complications, anastomotic leaks) and mortality. Surgery is reserved for T1b tumors (invasion into submucosa) or higher. * **D (Photodynamic Therapy):** This is an ablative therapy. While it can destroy superficial lesions, it does not provide a tissue specimen for margin analysis or staging. EMR is preferred over ablation for localized lesions because it provides a pathological diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **T1a (Mucosal) disease:** Low risk of lymph node metastasis (~1–5%); can often be managed endoscopically. * **T1b (Submucosal) disease:** High risk of lymph node metastasis (up to 20–25%); requires **Esophagectomy**. * **Staging Tool:** Endoscopic Ultrasound (EUS) is the most accurate modality for determining the depth of wall invasion (T stage). * **Barrett’s Esophagus with High-Grade Dysplasia:** Also ideally managed with endoscopic resection/ablation rather than immediate esophagectomy.

Question 89: Which of the following is not a risk factor for carcinoma of the esophagus?

A. Chronic alcohol use
B. H. pylori infection (Correct Answer)
C. Chronic GERD
D. Plummer Vinson syndrome

Explanation: **Explanation:** The correct answer is **H. pylori infection**. In the context of esophageal cancer, *H. pylori* is actually considered a **protective factor** rather than a risk factor. This is because *H. pylori* causes atrophic gastritis, which leads to decreased gastric acid production (hypochlorhydria). Reduced acid production decreases the severity of Gastroesophageal Reflux Disease (GERD), thereby lowering the risk of Barrett’s esophagus and subsequent Adenocarcinoma. **Analysis of Options:** * **Chronic alcohol use:** This is a major risk factor specifically for **Squamous Cell Carcinoma (SCC)** of the esophagus. It acts synergistically with tobacco. * **Chronic GERD:** Long-standing reflux leads to **Barrett’s Esophagus** (metaplasia of columnar epithelium), which is the primary precursor for **Adenocarcinoma**. * **Plummer-Vinson Syndrome:** Characterized by the triad of iron-deficiency anemia, glossitis, and esophageal webs. It is a well-known premalignant condition for **Squamous Cell Carcinoma** of the post-cricoid region. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type worldwide:** Squamous Cell Carcinoma (SCC). * **Most common type in the West/increasing incidence:** Adenocarcinoma. * **Location:** SCC is most common in the middle third; Adenocarcinoma is most common in the lower third. * **Other Risk Factors:** Achalasia cardia (SCC), Tylosis (hyperkeratosis of palms/soles), and ingestion of lye/corrosives. * **Protective factors:** High-fiber diet, fresh fruits, and *H. pylori* infection.

Question 90: Meckel's diverticulitis is indistinguishable at the bedside from which of the following conditions?

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

Explanation: **Explanation:** **Meckel’s diverticulitis** is often referred to as the "great mimic" in pediatric and young adult surgery. The correct answer is **Appendicitis** because both conditions present with a similar clinical triad: periumbilical pain that shifts to the right iliac fossa (RIF), localized tenderness, guarding, and rebound tenderness. The underlying medical concept is the **embryological origin and location**. Meckel’s diverticulum is a remnant of the vitellointestinal duct, typically located on the antimesenteric border of the ileum, approximately 2 feet (60 cm) from the ileocaecal valve. When this diverticulum becomes inflamed (diverticulitis), the resulting parietal peritoneal irritation occurs in the same anatomical region as the appendix, making them clinically indistinguishable at the bedside. **Why other options are incorrect:** * **Gastritis:** Presents with epigastric pain, dyspepsia, and vomiting, usually related to food intake; it does not localize to the RIF. * **Colitis:** Typically presents with diffuse abdominal cramping, diarrhea (often bloody), and tenesmus, rather than localized RIF peritonitis. * **Pancreatitis:** Characterized by severe, constant epigastric pain radiating to the back, often relieved by leaning forward, with elevated serum amylase/lipase. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 2s:** 2% of the population, 2 feet from the ileocaecal valve, 2 inches long, 2 types of ectopic tissue (Gastric - most common; Pancreatic), and usually presents before age 2. * **Most common presentation:** Painless lower GI bleeding (due to acid secretion from ectopic gastric mucosa causing ileal ulcers). * **Surgical Note:** If a normal appendix is found during surgery for suspected appendicitis, the surgeon must always check the distal 2 feet of the ileum for Meckel’s diverticulitis.

Practice by Chapter

Esophageal Disorders

Practice Questions

Gastric Disorders

Practice Questions

Small Intestine Pathology

Practice Questions

Appendicitis

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Inflammatory Bowel Disease

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Intestinal Obstruction

Practice Questions

Gastrointestinal Bleeding

Practice Questions

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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