Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 361: A patient presents with progressive dysphagia and a barium swallow shows a bird-beak appearance. What is the investigation of choice?

A. Manometry (Correct Answer)
B. pH monitoring
C. Endoscopy
D. CECT scan

Explanation: **Explanation:** The clinical presentation of progressive dysphagia (to both solids and liquids) combined with the classic **"bird-beak" appearance** on barium swallow is diagnostic of **Achalasia Cardia**. **1. Why Manometry is the Correct Answer:** While a barium swallow is often the initial screening test, **Esophageal Manometry is the Gold Standard (Investigation of Choice)** for Achalasia. It confirms the diagnosis by demonstrating the characteristic triad: * Failure of the Lower Esophageal Sphincter (LES) to relax upon swallowing. * Aperistalsis in the distal two-thirds of the esophagus. * Elevated resting LES pressure (>30 mmHg). **2. Why Other Options are Incorrect:** * **pH Monitoring:** This is the gold standard for diagnosing Gastroesophageal Reflux Disease (GERD), not motility disorders. * **Endoscopy:** This is the first investigation performed to rule out "Pseudoachalasia" (malignancy at the GE junction mimicking achalasia), but it cannot confirm the functional motility defect. * **CECT Scan:** Useful for staging esophageal cancer but has no role in the primary diagnosis of motility disorders like Achalasia. **High-Yield Clinical Pearls for NEET-PG:** * **Pathophysiology:** Degeneration of the **Auerbach’s (myenteric) plexus** in the esophageal wall. * **Barium Swallow Findings:** "Bird-beak" or "Rat-tail" appearance with a dilated proximal esophagus (Mega-esophagus). * **Heller’s Myotomy:** The surgical treatment of choice (usually performed laparoscopically with a Dor/Toupet fundoplication). * **POEM (Per-Oral Endoscopic Myotomy):** A newer, minimally invasive endoscopic treatment option. * **Chicago Classification:** Used to categorize Achalasia into three types based on manometry findings (Type II is the most common and most responsive to treatment).

Question 362: Dysphagia lusoria is caused by which of the following?

A. Compression by aberrant blood vessels (Correct Answer)
B. Achalasia Cardia
C. Mallory Weiss Tear
D. Carcinoma of the Esophagus

Explanation: **Explanation:** **Dysphagia lusoria** (derived from *lusus naturae*, meaning "jest of nature") is a clinical condition where swallowing is impaired due to extrinsic compression of the esophagus by an **aberrant right subclavian artery**. 1. **Why Option A is Correct:** In this congenital vascular anomaly, the right subclavian artery arises from the aortic arch distal to the left subclavian artery instead of the brachiocephalic trunk. To reach the right side, the vessel typically courses behind the esophagus (retro-esophageal), creating a mechanical indentation that leads to dysphagia. 2. **Why Other Options are Incorrect:** * **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 peristalsis. It is an intrinsic functional defect, not extrinsic compression. * **Mallory-Weiss Tear:** This refers to longitudinal mucosal lacerations at the gastroesophageal junction, usually following forceful vomiting or retching. It presents with hematemesis, not chronic dysphagia. * **Carcinoma of the Esophagus:** This is a malignant growth causing progressive dysphagia (initially for solids, then liquids). While it causes obstruction, it is due to intraluminal or intramural tumor growth rather than vascular anomalies. **High-Yield Clinical Pearls for NEET-PG:** * **Most common vascular anomaly** of the aortic arch is an aberrant right subclavian artery. * **Barium Swallow Finding:** Shows a characteristic **oblique pressure indentation** or "notch" on the posterior aspect of the esophagus at the level of the 3rd or 4th thoracic vertebrae. * **Diagnosis:** Gold standard for anatomy is **CT Angiography** or MRI. * **Treatment:** Most cases are asymptomatic. Surgical vascular reconstruction is reserved for severe symptoms or associated aneurysms (Kommerell’s diverticulum).

Question 363: Dumping syndrome occurs least with which of the following procedures?

A. Selective vagotomy
B. Truncal vagotomy
C. Highly selective vagotomy (Correct Answer)
D. Dumping syndrome occurs commonly with all of the above

Explanation: **Explanation:** Dumping syndrome is a common complication of gastric surgery caused by the rapid emptying of hyperosmolar chyme into the small intestine. The incidence of dumping syndrome is directly proportional to the extent of interference with the gastric emptying mechanism (the pylorus) and the gastric reservoir function. **Why Highly Selective Vagotomy (HSV) is the correct answer:** HSV (also known as parietal cell vagotomy) denervates only the acid-secreting proximal two-thirds of the stomach while **preserving the nerve supply to the antrum and the pylorus** (Nerves of Latarjet). Because the pyloric sphincter remains intact and functional, the controlled emptying of solids is maintained, and there is no need for a drainage procedure (like a pyloroplasty). Consequently, HSV has the lowest incidence of dumping syndrome (<1%) among all vagotomies. **Analysis of Incorrect Options:** * **Truncal Vagotomy (TV):** This involves severing the main vagal trunks, which denervates the pylorus and causes gastric stasis. To prevent stasis, a drainage procedure (Pyloroplasty or Gastrojejunostomy) is mandatory. This destroys the pyloric mechanism, leading to a high incidence of dumping (6-14%). * **Selective Vagotomy (SV):** This denervates the entire stomach but preserves the celiac and hepatic branches. Like TV, it still denervates the pylorus, requiring a drainage procedure and thus carrying a significant risk of dumping. **NEET-PG High-Yield Pearls:** * **Gold Standard for Duodenal Ulcer (historically):** HSV has the lowest morbidity but the **highest recurrence rate** (~10-15%) compared to TV. * **Early Dumping:** Occurs 15–30 mins post-prandial (vasomotor symptoms due to fluid shift). * **Late Dumping:** Occurs 1–3 hours post-prandial (reactive hypoglycemia due to insulin surge). * **Treatment:** Initial management is dietary modification (small, dry, low-carb meals). Octreotide is the drug of choice for refractory cases.

Question 364: Which of the following is NOT a feature of cirrhotic ascites?

A. Straw colour
B. Specific gravity < 1.060
C. Leukocyte count < 200/cu mm
D. Serum-ascitic albumin gradient < 1 (Correct Answer)

Explanation: **Explanation:** The correct answer is **D (Serum-ascitic albumin gradient < 1)** because cirrhotic ascites is a classic example of **transudative ascites** caused by portal hypertension. According to the Serum-Ascites Albumin Gradient (SAAG) classification, a **SAAG ≥ 1.1 g/dL** indicates that portal hypertension is the underlying cause (e.g., cirrhosis, congestive heart failure, Budd-Chiari syndrome). A SAAG < 1.1 g/dL suggests non-portal hypertensive causes like malignancy, tuberculosis, or nephrotic syndrome. **Analysis of Options:** * **A. Straw colour:** This is a typical feature of transudative fluid. If the fluid is milky, it suggests chylous ascites; if bloody, it suggests malignancy or trauma. * **B. Specific gravity < 1.016 (often rounded to 1.060 in older texts):** Transudates have low protein content and low specific gravity. While modern practice prefers SAAG, traditional criteria define transudates as having a specific gravity < 1.016 and total protein < 2.5 g/dL. * **C. Leukocyte count < 200/cu mm:** In uncomplicated cirrhosis, the white cell count is low. A polymorphonuclear (PMN) count **> 250 cells/mm³** is the diagnostic hallmark of **Spontaneous Bacterial Peritonitis (SBP)**, a common complication of cirrhosis. **NEET-PG High-Yield Pearls:** * **SAAG Formula:** Serum Albumin – Ascitic Fluid Albumin. * **High SAAG (≥ 1.1):** Cirrhosis, Alcoholic hepatitis, Cardiac ascites, Portal vein thrombosis. * **Low SAAG (< 1.1):** Peritoneal TB, Peritoneal carcinomatosis, Pancreatitis, Nephrotic syndrome. * **Gold Standard:** SAAG is 97% accurate in classifying ascites, superior to the old transudate/exudate (protein-based) system.

Question 365: What is the most common site for carcinoma of the stomach?

A. Antrum (Correct Answer)
B. Fundus
C. Lesser curvature
D. Greater curvature

Explanation: **Explanation:** The most common site for gastric carcinoma is the **Antrum (and Pylorus)**, accounting for approximately **50-60%** of all cases. This is primarily because the antrum is the site most frequently affected by chronic *Helicobacter pylori* infection and chronic atrophic gastritis, both of which are significant precursors to the intestinal type of gastric adenocarcinoma. **Analysis of Options:** * **A. Antrum (Correct):** As mentioned, the distal portion of the stomach (antrum and prepyloric region) remains the most frequent site globally. * **B. Fundus:** This is a relatively rare site for primary gastric cancer. However, there is a rising global incidence of cancers involving the **Cardia** (proximal stomach) due to the increase in GERD and obesity. * **C. Lesser Curvature:** While the lesser curvature is the most common site for **benign gastric ulcers**, it is the second most common site for malignancy after the antrum (specifically the distal lesser curvature). * **D. Greater Curvature:** This is an uncommon site for adenocarcinoma. If a mass is found here, clinicians often suspect other pathologies like Gastrointestinal Stromal Tumors (GIST) or Lymphoma. **High-Yield Clinical Pearls for NEET-PG:** * **Most common histological type:** Adenocarcinoma (95%). * **Lauren Classification:** Divides gastric cancer into **Intestinal** (associated with environmental factors/H. pylori) and **Diffuse** (associated with E-cadherin/CDH1 mutations and Signet ring cells). * **Virchow’s Node:** Left supraclavicular lymphadenopathy indicating metastasis. * **Sister Mary Joseph Nodule:** Periumbilical metastasis. * **Krukenberg Tumor:** Metastasis to the ovaries (classically showing signet ring cells). * **Irish Node:** Left axillary lymph node involvement.

Question 366: Amyl nitrate inhalation test is used to detect which of the following conditions?

A. Carcinoma esophagus
B. Achalasia cardia (Correct Answer)
C. Oesophageal diverticulum
D. Transeoesophageal fistula

Explanation: **Explanation:** The **Amyl nitrate inhalation test** is a pharmacological provocative test used in the evaluation of **Achalasia Cardia**. **1. Why Achalasia Cardia is correct:** Achalasia is characterized by the failure of the Lower Esophageal Sphincter (LES) to relax due to the loss of inhibitory nitrergic neurons. Amyl nitrate is a potent smooth muscle relaxant and vasodilator. When inhaled, it releases nitric oxide, which acts directly on the esophageal smooth muscle to cause relaxation of the hypertensive LES. During a barium swallow, if the administration of amyl nitrate causes the "bird’s beak" narrowing to open and allows the barium to drain into the stomach, it confirms a functional (muscular) obstruction rather than a fixed mechanical one. **2. Why other options are incorrect:** * **Carcinoma Esophagus:** This is a mechanical/organic obstruction caused by a physical tumor mass. Amyl nitrate (a smooth muscle relaxant) will not relax malignant tissue; therefore, the obstruction remains unchanged. * **Esophageal Diverticulum:** These are structural outpouchings (e.g., Zenker’s) caused by pressure changes or traction. They do not involve a primary failure of LES relaxation that responds to nitrates. * **Tracheoesophageal Fistula (TEF):** This is a congenital or acquired anatomical communication between the trachea and esophagus, requiring surgical correction, not pharmacological testing. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Barium Swallow Sign:** "Bird’s beak" or "Rat-tail" appearance. * **Heller’s Myotomy:** The surgical treatment of choice. * **Chagas Disease:** A common secondary cause of achalasia (caused by *Trypanosoma cruzi*).

Question 367: What is the most common symptom of bronchial adenoma?

A. Wheeze
B. Dyspnea
C. Recurrent hemoptysis (Correct Answer)
D. Pain

Explanation: **Explanation:** **Bronchial adenomas** (a historical term primarily referring to **Carcinoid tumors**, but also including adenoid cystic carcinomas and mucoepidermoid carcinomas) are slow-growing, highly vascular epithelial tumors arising from the bronchial mucosa. **Why Recurrent Hemoptysis is Correct:** The hallmark of these tumors is their **extreme vascularity** and their location, as approximately 80% arise in the central (major) bronchi. Because they are endobronchial and covered by a fragile, vascular mucous membrane, they bleed easily upon irritation or coughing. This leads to **recurrent hemoptysis** in about 50% of patients, making it the most common presenting symptom. **Analysis of Incorrect Options:** * **Wheeze (A):** While endobronchial obstruction can cause a localized wheeze (often mistaken for asthma), it is less frequent than bleeding. * **Dyspnea (B):** Shortness of breath occurs only when the tumor significantly occludes a major airway or causes massive collapse/consolidation, which usually happens later in the disease progression. * **Pain (C):** Lung parenchyma lacks pain fibers. Chest pain only occurs if the tumor involves the parietal pleura or chest wall, which is rare for these typically central tumors. **NEET-PG High-Yield Pearls:** * **Most common type:** Bronchial Carcinoid (90%). * **Classic Triad:** Cough, recurrent hemoptysis, and localized wheeze. * **Radiology:** May show "Golden S-sign" if the tumor causes obstructive collapse of the right upper lobe. * **Diagnosis:** Bronchoscopy is definitive (shows a pink/cherry-red fleshy mass), but biopsy carries a **high risk of bleeding** due to vascularity. * **Treatment:** Surgical resection (Sleeve resection or Lobectomy) is the treatment of choice.

Question 368: In a burn patient, which part of the gastrointestinal tract is most commonly associated with Curling's ulcer?

A. First part of the duodenum (Correct Answer)
B. Second part of the duodenum
C. Third part of the duodenum
D. Junction between the second and third part of the duodenum

Explanation: **Explanation:** **Curling’s ulcer** is a stress-induced acute erosion or ulceration of the gastrointestinal tract occurring as a complication of severe burns. **1. Why Option A is Correct:** The **first part of the duodenum** is the most common site for Curling’s ulcers. The underlying pathophysiology involves severe hypovolemia leading to splanchnic vasoconstriction. This reduced mucosal blood flow results in ischemia and the breakdown of the mucosal barrier, making the tissue susceptible to damage by gastric acid. While these ulcers can occur in the stomach, the proximal duodenum remains the classic and most frequent location. **2. Why Options B, C, and D are Incorrect:** * **Second and Third parts of the duodenum:** These areas are distal to the "bulb" (first part). While stress ulcers can theoretically occur anywhere in the GI tract, the first part is physiologically more vulnerable due to its proximity to gastric acid output and its specific vascular supply patterns. * **Junctions:** There is no clinical or anatomical evidence suggesting a predilection for these ulcers at the junctions of the duodenal segments. **3. Clinical Pearls for NEET-PG:** * **Cushing’s Ulcer:** Associated with **Elevated Intracranial Pressure (ICP)** or head trauma. Unlike Curling’s (ischemic), Cushing’s ulcers are caused by vagal overstimulation leading to gastric acid hypersecretion. They are more commonly found in the **stomach**. * **Prophylaxis:** The incidence of Curling’s ulcer has significantly decreased due to the routine use of H2 blockers, Proton Pump Inhibitors (PPIs), and early enteral feeding in burn units. * **Complication:** The most common life-threatening complication of a Curling’s ulcer is **perforation** or upper GI hemorrhage.

Question 369: Which of the following is NOT true about gastric carcinoma?

A. Helicobacter pylori association is present.
B. D2 gastrectomy includes total gastrectomy.
C. Surgically non-curative lesions should not be resected. (Correct Answer)
D. Patients undergoing total gastrectomy should be given vitamin B12.

Explanation: **Explanation:** The management of gastric carcinoma involves a balance between curative resection and palliative care. **Why Option C is the correct answer (False statement):** In gastric cancer, even if a lesion is deemed **surgically non-curative** (e.g., due to distant metastasis or local invasion), surgery may still be indicated for **palliation**. Palliative gastrectomy or bypass procedures are performed to alleviate life-threatening complications such as gastric outlet obstruction, uncontrollable hemorrhage, or perforation. Therefore, the statement that non-curative lesions should *not* be resected is clinically incorrect. **Analysis of Incorrect Options (True statements):** * **Option A:** *H. pylori* is a Class I carcinogen. It causes chronic atrophic gastritis and intestinal metaplasia, significantly increasing the risk of distal gastric adenocarcinoma. * **Option B:** D2 gastrectomy refers to the extent of lymphadenectomy (removal of N1 and N2 nodes). It can be performed as part of either a **subtotal** or a **total gastrectomy**, depending on the tumor's location (proximal vs. distal). * **Option D:** Total gastrectomy removes all parietal cells, which produce **Intrinsic Factor**. This leads to the malabsorption of Vitamin B12, necessitating lifelong parenteral supplementation to prevent megaloblastic anemia. **NEET-PG High-Yield Pearls:** * **Standard of Care:** D2 lymphadenectomy is the gold standard for curative resection. * **Lauren Classification:** Divides gastric cancer into **Intestinal** (associated with *H. pylori*) and **Diffuse** (associated with CDH1 mutation/Signet ring cells). * **Virchow’s Node:** Left supraclavicular lymphadenopathy indicating metastatic spread. * **Sister Mary Joseph Nodule:** Periumbilical metastasis.

Question 370: An elderly patient presented with early satiety and weight loss, attributing these symptoms to aging. Upper endoscopy revealed a large mass in the stomach. Which statement is TRUE regarding gastric carcinoma?

A. During resection, it is safe to leave cancer at the cut edges.
B. The incidence is increased in patients with gastric ulcer disease. (Correct Answer)
C. Draining lymph nodes should not be removed.
D. It is caused by diverticulitis.

Explanation: **Explanation:** Gastric carcinoma is a significant gastrointestinal malignancy, often presenting late due to non-specific symptoms like early satiety and weight loss. **Why Option B is Correct:** There is a strong association between chronic gastric inflammation and malignancy. Patients with **chronic gastric ulcers** (especially those associated with *H. pylori* infection) and **atrophic gastritis** are at a higher risk of developing adenocarcinoma. While duodenal ulcers are generally not premalignant, gastric ulcers require close monitoring and biopsy to rule out underlying malignancy, as the chronic regenerative process can lead to dysplasia. **Why the Other Options are Incorrect:** * **Option A:** In oncological surgery, achieving **R0 resection** (microscopically negative margins) is the goal. Leaving cancer at the cut edges (R1 or R2 resection) significantly increases the risk of recurrence and worsens prognosis. * **Option C:** Lymph node involvement is the most important prognostic factor. A **D2 lymphadenectomy** (removal of perigastric and celiac axis nodes) is the standard of care in gastric cancer surgery to ensure adequate staging and local control. * **Option D:** Diverticulitis is an inflammatory condition of the colon (most commonly the sigmoid) and has no etiological link to gastric carcinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** *H. pylori* (most common), smoking, salted/smoked foods (nitrosamines), Blood Group A, and Menetrier’s disease. * **Lauren Classification:** Divides gastric cancer into **Intestinal** (associated with environmental factors) and **Diffuse** (associated with *CDH1* mutation/E-cadherin loss; characterized by Linitis Plastica). * **Virchow’s Node:** Left supraclavicular lymphadenopathy indicating metastatic gastric cancer. * **Sister Mary Joseph Nodule:** Periumbilical metastasis.

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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