Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 391: A 58-year-old lady is diagnosed with carcinoma of the stomach. A CT scan of the abdomen shows a 4 cm mass in the antrum with involvement of the serosa. What is the treatment?

A. Total gastrectomy
B. Subtotal gastrectomy (Correct Answer)
C. Palliative care
D. Chemotherapy

Explanation: **Explanation:** The management of gastric adenocarcinoma is primarily determined by the **location** of the tumor and the **stage** of the disease. **1. Why Subtotal Gastrectomy is correct:** For tumors located in the **distal stomach (antrum or pylorus)**, a **Subtotal Gastrectomy** is the procedure of choice. The goal is to achieve a proximal resection margin of at least 5 cm (for intestinal-type) to 8 cm (for diffuse-type). In distal lesions, this margin can be comfortably achieved while preserving the proximal stomach (fundus), which leads to better functional outcomes and nutritional status compared to a total gastrectomy. Since the CT shows serosal involvement but no mention of distant metastasis, the intent remains curative (Radical Gastrectomy with D2 lymphadenectomy). **2. Why other options are incorrect:** * **Total Gastrectomy:** This is indicated for tumors involving the **proximal stomach (cardia/fundus)** or the **body** of the stomach, and for linitis plastica, where a subtotal resection cannot guarantee tumor-free margins. * **Palliative Care:** This is reserved for Stage IV disease (distant metastasis like Krukenberg tumor, Virchow’s node, or peritoneal seeding). A 4 cm mass with serosal involvement (T3/T4a) without metastasis is still resectable. * **Chemotherapy:** While perioperative chemotherapy (FLOT regimen) is often used for T3/T4 tumors, it is an adjunct to surgery, not a replacement for it. **Clinical Pearls for NEET-PG:** * **Standard of Care:** Radical Gastrectomy + **D2 Lymphadenectomy** (removal of station 1–12 nodes). * **Resection Margins:** Minimum **5 cm** for intestinal type; **8 cm** for diffuse type (due to submucosal spread). * **Reconstruction:** After subtotal gastrectomy, reconstruction is typically via **Billroth II** or **Roux-en-Y** gastrojejunostomy. * **Most common site:** Historically the antrum, though the incidence of proximal (cardia) tumors is rising.

Question 392: All the following polyps are premalignant except:

A. Juvenile polyp (Correct Answer)
B. Peutz Jeghers syndrome
C. Juvenile polyposis syndrome
D. Familial polyposis syndrome

Explanation: **Explanation:** The core concept in evaluating the malignant potential of intestinal polyps is distinguishing between **hamartomatous** (disorganized normal tissue) and **adenomatous** (dysplastic) growths. 1. **Why Juvenile Polyp is the correct answer:** A solitary **Juvenile polyp** is a simple hamartoma, typically occurring in children (under age 10). It is considered a benign lesion with **no malignant potential**. These are usually solitary, pedunculated, and often present with painless rectal bleeding or auto-amputation. 2. **Why the other options are considered premalignant:** * **Juvenile Polyposis Syndrome (JPS):** Unlike a solitary polyp, JPS involves multiple (usually >5) hamartomatous polyps. There is a significant risk (up to 50%) of developing colorectal cancer because these hamartomas can undergo adenomatous transformation over time. * **Peutz-Jeghers Syndrome (PJS):** While the characteristic polyps are hamartomatous, patients have a markedly increased risk of both GI and extra-GI malignancies (pancreas, breast, ovary). The polyps themselves can occasionally harbor foci of dysplasia. * **Familial Adenomatous Polyposis (FAP):** This is the classic premalignant syndrome. It is characterized by hundreds to thousands of **adenomatous** polyps. Without a prophylactic total proctocolectomy, the risk of colorectal cancer is virtually 100% by age 40. **NEET-PG High-Yield Pearls:** * **Most common site for Juvenile Polyps:** Rectum. * **Peutz-Jeghers Syndrome Triad:** Mucocutaneous pigmentation (lips/buccal mucosa), hamartomatous polyps, and autosomal dominant inheritance (STK11 mutation). * **Gardner Syndrome:** FAP + Osteomas + Desmoid tumors + Epidermoid cysts. * **Turcot Syndrome:** FAP + CNS tumors (Medulloblastoma/Glioma).

Question 393: A female patient presents with dysphagia and intermittent epigastric pain. Endoscopy reveals esophageal dilatation above and narrowing at the lower end. What is the recommended treatment?

A. Proton Pump Inhibitor (PPI)
B. Dilatation
C. Esophagectomy
D. Heller's cardiomyotomy (Correct Answer)

Explanation: ### Explanation **Diagnosis: Achalasia Cardia** The clinical presentation of dysphagia and epigastric pain, combined with endoscopic findings of proximal esophageal dilatation and distal narrowing ("bird-beak" appearance on imaging), is classic for **Achalasia Cardia**. This is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of esophageal peristalsis. **Why Heller’s Cardiomyotomy is Correct:** **Heller’s Myotomy** (usually performed laparoscopically) is the surgical gold standard for Achalasia. It involves incising the longitudinal and circular muscle fibers of the distal esophagus and the proximal stomach to relieve the functional obstruction at the LES. It is often combined with a partial fundoplication (e.g., Dor or Toupet) to prevent postoperative gastroesophageal reflux. **Why Other Options are Incorrect:** * **A. Proton Pump Inhibitors (PPIs):** These treat GERD. In Achalasia, the problem is an aperistaltic esophagus and a tight sphincter, not acid reflux. * **B. Dilatation:** Pneumatic dilatation is a non-surgical alternative; however, it carries a risk of perforation (approx. 3%) and often requires repeat sessions. Surgery is generally preferred for long-term relief in fit patients. * **C. Esophagectomy:** This is a radical procedure reserved only for "End-stage Achalasia" (Mega-esophagus or Sigmoid esophagus) where the esophagus is massively dilated and non-functional. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Barium Swallow Finding:** "Bird-beak" or "Rat-tail" appearance. * **Pathology:** Degeneration of the **Auerbach’s (Myenteric) plexus**. * **POEM (Per-Oral Endoscopic Myotomy):** A newer, minimally invasive endoscopic treatment gaining popularity. * **Triad of Achalasia:** Dysphagia (to both solids and liquids), Regurgitation, and Weight loss.

Question 394: Mortality rate is higher among which of the following conditions?

A. Small intestinal obstruction
B. Colonic obstruction (Correct Answer)
C. Adynamic ileus
D. Intestinal pseudo obstruction

Explanation: **Explanation:** The mortality rate is significantly higher in **colonic obstruction** (Option B) compared to small bowel obstruction or functional disorders. This is primarily due to the **"Closed-Loop" phenomenon**. In many patients, the ileocecal valve remains competent, preventing the reflux of colonic contents back into the small intestine. This leads to a rapid increase in intraluminal pressure, compromising capillary perfusion and resulting in early gangrene and perforation (most commonly at the **cecum**, which has the largest diameter and thinnest wall according to **Laplace’s Law**). Furthermore, colonic obstructions often occur in older populations with significant comorbidities and are frequently caused by malignancies. **Analysis of Incorrect Options:** * **Small Intestinal Obstruction (A):** While more common, it generally has a lower mortality rate because the proximal gut can decompress via vomiting, and the ileocecal valve does not create a closed loop unless there is a specific twist (volvulus). * **Adynamic Ileus (C):** This is a functional failure of peristalsis without physical blockage. It is usually self-limiting or managed by treating the underlying cause (e.g., electrolyte imbalance), rarely leading to ischemia or death. * **Intestinal Pseudo-obstruction (D):** Also known as Ogilvie’s syndrome, this is a functional dilation of the colon. While it carries risks, the mortality is generally lower than mechanical colonic obstruction unless perforation occurs. **NEET-PG High-Yield Pearls:** * **Most common cause of SBO:** Post-operative adhesions. * **Most common cause of LBO:** Colorectal carcinoma. * **Laplace’s Law:** Pressure = Tension / Radius. This explains why the **cecum** is the most common site of perforation in distal colonic obstruction. * **X-ray finding:** Colonic obstruction shows peripheral gas shadows with haustral markings (which do not cross the entire lumen), unlike the central valvulae conniventes of the small bowel.

Question 395: Snow storm ascites is seen in which of the following conditions?

A. Meconium ileus (Correct Answer)
B. Hirschsprung disease
C. Ileocaecal tuberculosis
D. Pseudomyxoma peritonei

Explanation: **Explanation:** **Snow storm ascites** is a classic radiological and ultrasonographic finding associated with **Meconium Peritonitis**, which is a common complication of **Meconium Ileus** (seen in approximately 15-20% of newborns with Cystic Fibrosis). When meconium ileus leads to antenatal bowel perforation, sterile meconium escapes into the peritoneal cavity. This triggers a chemical inflammatory response resulting in the formation of calcium deposits. On ultrasound, these scattered, echogenic calcifications suspended in ascitic fluid create a characteristic "snow storm" appearance. **Analysis of Options:** * **Meconium Ileus (Correct):** Antenatal perforation leads to meconium peritonitis. The resulting intraperitoneal calcifications and fluid produce the "snow storm" effect on imaging. * **Hirschsprung Disease:** While it can cause neonatal intestinal obstruction and potential perforation, it typically presents with postnatal enterocolitis or "egg-shell" calcification (rarely) rather than the diffuse snow storm pattern. * **Ileocaecal Tuberculosis:** Characterized by "wet" or "dry" types of peritonitis. Ultrasound typically shows "matted bowel loops" or "cocoon abdomen," not snow storm ascites. * **Pseudomyxoma Peritonei:** Known for the "scalloping of the liver" and "jelly belly" (mucinous ascites). While the fluid is thick, it does not typically present with the specific echogenic calcification pattern of meconium peritonitis. **High-Yield Clinical Pearls for NEET-PG:** * **Neuhauser’s Sign (Ground-glass appearance):** X-ray finding in Meconium Ileus due to air bubbles trapped in meconium. * **Cystic Fibrosis:** 90% of infants with meconium ileus have CF. * **Microcolon:** A common finding on contrast enema in meconium ileus due to disuse of the distal colon. * **Egg-shell calcification:** Often associated with healed meconium peritonitis or specific lymph nodes in silicosis.

Question 396: Which of the following investigations is useful in the evaluation of upper gastrointestinal bleeding?

A. Endoscopy (Correct Answer)
B. CT abdomen
C. Capsule endoscopy
D. Enteroscopy

Explanation: **Explanation:** **Upper Gastrointestinal Endoscopy (UGIE)** is the gold standard and the initial investigation of choice for evaluating upper GI bleeding (bleeding proximal to the Ligament of Treitz). 1. **Why Endoscopy is Correct:** * **Diagnostic & Therapeutic:** It allows for direct visualization of the mucosa to identify the source (e.g., peptic ulcer, varices, Mallory-Weiss tears). Crucially, it enables immediate therapeutic interventions like hemoclip application, sclerotherapy, or band ligation. * **Prognostic:** It allows for risk stratification using the **Forrest Classification** for peptic ulcer bleeding, which predicts the risk of re-bleeding. 2. **Why Other Options are Incorrect:** * **CT Abdomen:** While useful for detecting masses or vascular malformations, it lacks the sensitivity of UGIE for mucosal lesions and offers no therapeutic capability. * **Capsule Endoscopy:** This is primarily used for **obscure GI bleeding** (small bowel) when both UGIE and colonoscopy are negative. It cannot be used in acute settings as it cannot perform biopsies or therapy. * **Enteroscopy:** This involves the examination of the small intestine (distal to the duodenum). It is technically demanding and reserved for suspected mid-gut bleeding, not routine upper GI evaluation. **High-Yield Clinical Pearls for NEET-PG:** * **Initial Management:** The first step in any GI bleed is **hemodynamic stabilization** (ABC - Airway, Breathing, Circulation) before endoscopy. * **Timing:** Early endoscopy (within 24 hours) is recommended for most patients. * **Rockall & Blatchford Scores:** These are clinical scoring systems used to predict mortality and the need for intervention in UGIE bleeding. * **Drug of Choice:** IV Proton Pump Inhibitors (PPIs) should be started to stabilize clots in peptic ulcer disease.

Question 397: Boerhaave syndrome is the spontaneous rupture of which part of the esophagus?

A. Lower esophagus (Correct Answer)
B. Upper esophagus
C. Middle esophagus
D. Stomach

Explanation: **Explanation:** **Boerhaave syndrome** is a transmural (full-thickness) spontaneous perforation of the esophagus. It typically occurs due to a sudden, massive increase in intra-esophageal pressure against a closed glottis, most commonly during forceful vomiting or retching (the Mackler triad: vomiting, chest pain, and subcutaneous emphysema). **Why the Lower Esophagus is Correct:** The rupture most frequently occurs in the **left posterolateral aspect of the distal (lower) esophagus**, approximately 2–3 cm above the gastroesophageal junction. This area is anatomically predisposed to rupture because: 1. It lacks a serosal layer (common to the entire esophagus). 2. There is a relative thinning of the longitudinal muscle fibers in this region. 3. There is a lack of surrounding structural support from adjacent organs compared to the thoracic segment. **Why Other Options are Incorrect:** * **Upper and Middle Esophagus:** These segments are better supported by surrounding mediastinal structures and have a more robust muscular arrangement. Perforations here are usually iatrogenic (e.g., during endoscopy) rather than spontaneous. * **Stomach:** While forceful vomiting can cause a mucosal tear at the gastroesophageal junction (**Mallory-Weiss tear**), it does not typically result in a spontaneous transmural rupture of the stomach wall in this clinical context. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The gold standard is a **Gastrografin (water-soluble) swallow study**, which shows extravasation of contrast. * **Chest X-ray:** May show **pneumomediastinum**, left-sided pleural effusion, or the **V-sign of Naclerio** (air behind the heart). * **Management:** This is a surgical emergency. If detected within 24 hours, primary surgical repair and mediastinal drainage are indicated. * **Distinction:** Unlike Mallory-Weiss syndrome (mucosal tear, presents with hematemesis), Boerhaave syndrome is a full-thickness rupture and hematemesis is usually absent.

Question 398: A 23-year-old lady presents with acute right lower abdominal pain for the past 4 hours. There is tenderness at McBurney's point. Which investigation is best suited to confirm the diagnosis of appendicitis?

A. CT Scan (Correct Answer)
B. Plain X-ray
C. Serum ESR
D. MRI Abdomen

Explanation: **Explanation:** The clinical presentation of right lower quadrant pain and tenderness at McBurney’s point is highly suggestive of **Acute Appendicitis**. **Why CT Scan is the Correct Answer:** Contrast-enhanced Computed Tomography (CECT) of the abdomen and pelvis is the **Gold Standard** and the most accurate investigation for diagnosing appendicitis in adults (Sensitivity >94%, Specificity >95%). It helps confirm the diagnosis by showing an appendiceal diameter >6 mm, wall thickening, and periappendiceal fat stranding. It is also superior in identifying complications like phlegmon, abscess, or perforation and helps rule out other differential diagnoses. **Why Other Options are Incorrect:** * **Plain X-ray:** It has very low sensitivity. While it may occasionally show a radio-opaque fecalith (appendicolith) or localized ileus, it cannot confirm the diagnosis. * **Serum ESR:** This is a non-specific marker of inflammation. While it may be elevated, it does not provide a definitive anatomical diagnosis. * **MRI Abdomen:** While highly accurate, it is expensive and not readily available in emergency settings. It is generally reserved as the second-line investigation in **pregnant women** if Ultrasound is inconclusive. **High-Yield Clinical Pearls for NEET-PG:** * **Investigation of Choice (Adults):** CT Scan. * **Investigation of Choice (Children/Pregnant Women):** Ultrasonography (USG). * **Most Common Cause:** Luminal obstruction (Fecalith in adults; Lymphoid hyperplasia in children). * **Alvarado Score:** A clinical scoring system used to predict the likelihood of appendicitis (MANTRELS mnemonic). A score of ≥7 usually warrants surgical intervention. * **Most Common Position of Appendix:** Retrocecal (75%).

Question 399: What is the best investigation to diagnose colonic diverticulosis?

A. Barium enema (Correct Answer)
B. CT Scan
C. Ultrasound
D. MRI

Explanation: **Explanation:** **1. Why Barium Enema is the Correct Answer:** For the specific diagnosis of **colonic diverticulosis** (the presence of asymptomatic out-pouchings), **Barium Enema** remains the gold standard investigation. It provides excellent mucosal detail, allowing for the visualization of the characteristic "saw-tooth" appearance of the colon and the filling of small diverticular sacs with contrast. It is highly sensitive for mapping the extent and distribution of the disease. **2. Why Other Options are Incorrect:** * **CT Scan:** While CT scan is the **investigation of choice for acute diverticulitis** (to look for wall thickening, pericolic fat stranding, or abscesses), it is less sensitive than Barium Enema for detecting small, uncomplicated diverticula. * **Ultrasound:** This is operator-dependent and often limited by bowel gas. While it may show thickened bowel walls in inflammation, it is not used for definitive diagnosis of diverticulosis. * **MRI:** Though highly detailed, it is expensive, time-consuming, and offers no significant diagnostic advantage over CT or Barium Enema for this condition. **Clinical Pearls for NEET-PG:** * **Investigation of Choice (IOC) for Diverticulosis:** Barium Enema. * **IOC for Acute Diverticulitis:** Contrast-Enhanced CT (CECT) of the Abdomen. * **Contraindication:** Barium Enema and Colonoscopy are **strictly contraindicated** in the acute phase of diverticulitis due to the high risk of perforation. * **Most Common Site:** Sigmoid colon (due to high intraluminal pressure). * **Most Common Complication:** Diverticulitis; however, diverticulosis is the most common cause of massive lower GI bleeding in the elderly.

Question 400: Which of the following is the primary use of the nasogastric tube depicted?

A. Common bile duct drainage
B. Jejunal feeding
C. Pelvic drainage
D. Gastric drainage (Correct Answer)

Explanation: ***Gastric drainage*** - A **nasogastric tube** (Ryle's tube) is primarily designed for **gastric decompression** and drainage of stomach contents. - It helps remove **gastric secretions**, **air**, and **fluid** to prevent distension and aspiration, especially post-operatively. *Common bile duct drainage* - **Bile duct drainage** requires specialized tubes like **T-tubes** or **percutaneous transhepatic cholangiography (PTC)** catheters. - A nasogastric tube cannot reach the **biliary system** as it terminates in the stomach. *Jejunal feeding* - **Jejunal feeding** requires a **nasojejunal tube** or **jejunostomy tube** that extends beyond the **pylorus** into the small intestine. - A standard nasogastric tube ends in the **stomach** and is unsuitable for direct jejunal nutrition. *Pelvic drainage* - **Pelvic drainage** requires **surgical drains** placed directly in the pelvic cavity through the **abdomen** or **perineum**. - A nasogastric tube inserted through the **nose** cannot access pelvic structures anatomically.

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

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