Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 791: What is the investigation of choice in diffuse esophageal spasm?

A. Manometry (Correct Answer)
B. Esophagoscopy
C. Barium examination showing tertiary contractions
D. CT thorax

Explanation: **Explanation:** **Diffuse Esophageal Spasm (DES)** is a primary motility disorder characterized by uncoordinated, simultaneous, and non-peristaltic contractions of the esophageal body. 1. **Why Manometry is the Investigation of Choice:** Manometry is the **gold standard** for diagnosing esophageal motility disorders because it provides a direct physiological measurement of pressure changes and coordination within the esophagus. In DES, manometry classically reveals high-amplitude, simultaneous, non-peristaltic contractions (occurring in >20% of wet swallows) with intermittent normal peristalsis. Modern High-Resolution Manometry (HRM) specifically identifies this as "Distal Esophageal Spasm" based on a shortened **Distal Latency (DL < 4.5 seconds)**. 2. **Why other options are incorrect:** * **Barium Examination:** While it may show the classic **"Corkscrew" or "Rosary Bead" esophagus**, this is only present during an active spasm. It is a suggestive radiological sign but lacks the sensitivity and specificity of manometry. * **Esophagoscopy:** This is primarily used to rule out structural lesions, malignancy, or reflux esophagitis (pseudo-spasm). In DES, the mucosa usually appears normal. * **CT Thorax:** This provides anatomical detail but cannot assess dynamic esophageal motility or pressure changes. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Presents with intermittent chest pain (mimicking angina) and dysphagia to both solids and liquids, often triggered by cold liquids or stress. * **Radiology:** Look for the "Corkscrew esophagus" on Barium swallow. * **Treatment:** Initial management involves Nitrates or Calcium Channel Blockers (to relax smooth muscle). Surgical option is a **Long Esophageal Myotomy**. * **Differential:** Always rule out Cardiac causes first in patients presenting with spasmodic chest pain.

Question 792: Which of the following statements is NOT true regarding gastrointestinal tuberculosis?

A. Formation of transverse ulcers
B. Common site is the ileocecal region
C. An obtuse ileocecal angle is seen
D. Surgical management is the treatment of choice (Correct Answer)

Explanation: **Explanation:** Gastrointestinal (GI) Tuberculosis is a common extrapulmonary manifestation of TB, primarily caused by *Mycobacterium tuberculosis*. **1. Why Option D is the Correct Answer (The "False" Statement):** The primary treatment for GI tuberculosis is **Medical Management** using Antitubercular Therapy (ATT). Most cases, including the hyperplastic and ulcerative varieties, respond well to a standard 6-month course of ATT. **Surgery is NOT the treatment of choice**; it is reserved only for complications such as intestinal obstruction (most common), perforation, fistula formation, or massive hemorrhage. **2. Analysis of Other Options:** * **Option A (Transverse Ulcers):** In intestinal TB, the lymphatics of the bowel run circumferentially. Since the bacilli spread via these lymphatics, the resulting ulcers are **transverse (horizontal)** to the long axis of the bowel. This is a classic distinguishing feature from Typhoid ulcers, which are longitudinal. * **Option B (Ileocecal Region):** This is the **most common site** (75% of cases) due to the high density of lymphoid tissue (Peyer’s patches), physiological stasis, and increased absorption in this area. * **Option C (Obtuse Ileocecal Angle):** In the hyperplastic variety, fibrosis and thickening of the ileocecal valve lead to its incompetence and "pulling up" of the cecum. This results in an **obtuse ileocecal angle**, often visualized on a barium meal as the "Stierlin’s sign" or "Goose neck deformity." **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication:** Intestinal obstruction (due to strictures). * **Stricturoplasty:** The surgical procedure of choice for multiple short-segment strictures to preserve bowel length. * **Fleischner Sign:** Thickening of the ileocecal valve on imaging. * **Differential Diagnosis:** Crohn’s disease (often presents with longitudinal ulcers and non-caseating granulomas, whereas TB shows caseating granulomas).

Question 793: Which of the following statements is true about appendicular rupture?

A. It is common in the extremes of age.
B. It is common in people with fecolith obstruction.
C. Early antibiotics can prevent rupture. (Correct Answer)
D. Appendicectomy is always performed in the presence of rupture.

Explanation: ### Explanation **Correct Option: C. Early antibiotics can prevent rupture.** The pathophysiology of appendicitis involves initial luminal obstruction followed by bacterial overgrowth and increased intraluminal pressure. This leads to venous congestion and, eventually, arterial compromise (gangrene). Administering **broad-spectrum antibiotics early** in the course of inflammation can reduce the bacterial load and inflammatory edema, potentially halting the progression to transmural necrosis and subsequent rupture. This is the basis for the "conservative-first" approach in specific uncomplicated cases. **Analysis of Incorrect Options:** * **A. It is common in the extremes of age:** While rupture is more *dangerous* in the elderly and children due to a lack of omental development (the "policeman of the abdomen"), it is statistically more common in **young adults**, simply because the overall incidence of appendicitis is highest in this age group. * **B. It is common in people with fecolith obstruction:** While a fecolith is a common cause of obstruction, it is not a prerequisite for rupture. Many ruptures occur due to lymphoid hyperplasia or non-obstructive infectious processes. * **D. Appendicectomy is always performed in the presence of rupture:** This is incorrect. If a rupture has led to a **walled-off appendicular abscess or mass**, immediate surgery is often avoided due to the risk of bowel injury and fistula formation. Instead, **Ochsner-Sherren management** (conservative treatment with interval appendicectomy after 6–8 weeks) is preferred. **High-Yield NEET-PG Pearls:** * **Most common site of rupture:** The antimesenteric border, just distal to the point of obstruction (the area with the poorest blood supply). * **Risk Factors:** Extremes of age have a higher *rate* of perforation (up to 80-90% in neonates) because they cannot localize the infection. * **Imaging:** Contrast-Enhanced CT (CECT) is the gold standard for diagnosing a ruptured appendix and associated collections.

Question 794: Which is the most common cause of the below condition?

A. Gastric ulcer
B. Duodenal ulcer
C. Gastric carcinoma (Correct Answer)
D. Hiatus hernia

Explanation: ***Gastric carcinoma*** - **Antral carcinoma** is the most common cause of **gastric outlet obstruction** in adults, causing pyloric stenosis through tumor growth and fibrosis. - Typically presents with **progressive dysphagia**, **weight loss**, and **epigastric pain** with a palpable mass. *Gastric ulcer* - Gastric ulcers rarely cause **pyloric stenosis** as they typically occur in the body or fundus, not near the pylorus. - When they do occur near the pylorus, they more commonly cause **perforation** or **bleeding** rather than obstruction. *Duodenal ulcer* - Can cause **pyloroduodenal obstruction** through scarring and fibrosis, but is **less common** than gastric carcinoma as a cause of gastric outlet obstruction. - Usually associated with **H. pylori infection** and presents with **postprandial pain** rather than progressive obstruction. *Hiatus hernia* - Involves **herniation of stomach** through the **diaphragmatic hiatus** into the thoracic cavity. - Does **not cause pyloric stenosis** as it affects the gastroesophageal junction, not the gastric outlet.

Question 795: A patient with a gastric ulcer has a biopsy that reveals malignancy. What is the next step in management?

A. Ultrasound abdomen
B. CT abdomen (Correct Answer)
C. CA 19-9 level
D. Laparoscopy

Explanation: **Explanation:** Once a gastric ulcer is histologically confirmed as malignant (Gastric Adenocarcinoma), the immediate next step is **clinical staging** to determine the extent of the disease and assess resectability. **Why CT Abdomen is the correct answer:** Contrast-Enhanced Computed Tomography (CECT) of the abdomen and pelvis is the **standard initial staging investigation** for gastric cancer. It is highly effective at evaluating the local extent of the tumor (T stage), identifying regional lymphadenopathy (N stage), and detecting distant visceral metastases (M stage), particularly to the liver. **Analysis of Incorrect Options:** * **A. Ultrasound abdomen:** While useful for screening, USG lacks the sensitivity and specificity required for accurate TNM staging of gastric cancer and cannot reliably assess nodal involvement or depth of wall invasion. * **C. CA 19-9 level:** Tumor markers (CEA, CA 19-9) are not used for the initial diagnosis or staging of gastric cancer. They are primarily used for monitoring recurrence post-treatment. * **D. Laparoscopy:** Diagnostic laparoscopy (with peritoneal washings) is the most sensitive method for detecting occult peritoneal carcinomatosis. However, it is performed **after** a CT scan has ruled out distant hematogenous metastasis, making it a subsequent step rather than the immediate next step. **NEET-PG High-Yield Pearls:** * **Investigation of Choice (IOC) for Diagnosis:** Upper GI Endoscopy + Biopsy (minimum 6-8 biopsies from the ulcer edge). * **IOC for Staging:** CECT Abdomen and Pelvis. * **Most accurate for T and N staging:** Endoscopic Ultrasound (EUS). * **Most sensitive for peritoneal metastasis:** Diagnostic Laparoscopy. * **Virchow’s Node:** Left supraclavicular lymph node involvement (Troisier’s sign).

Question 796: Regarding Achalasia Cardia, which of the following statements are true?

A. 1, 2, and 3 are false, while 4 and 5 are true.
B. 1, 2, and 4 are true, while 3 and 5 are false. (Correct Answer)
C. 2, 3, and 4 are true, while 1 and 5 are false.
D. 1, 3, and 5 are true, while 2 and 4 are false.

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 progressive peristalsis in the distal esophagus. This results from the degeneration of the **myenteric (Auerbach’s) plexus**. ### **Analysis of Statements** 1. **Statement 1 (True):** The hallmark pathophysiology is the loss of inhibitory postganglionic neurons (which release Nitric Oxide and VIP) in the myenteric plexus, leading to an hypertensive, non-relaxing LES. 2. **Statement 2 (True):** Dysphagia is the most common symptom, characteristically occurring for **both solids and liquids** from the onset (unlike esophageal cancer, where it progresses from solids to liquids). 3. **Statement 3 (False):** Barium swallow typically shows a **"Bird’s beak"** or "Rat-tail" appearance due to persistent narrowing at the GE junction with proximal dilatation. A "Corkscrew esophagus" is characteristic of Diffuse Esophageal Spasm (DES). 4. **Statement 4 (True):** **Manometry** is the **Gold Standard** for diagnosis. Key findings include incomplete LES relaxation (residual pressure >10 mmHg) and aperistalsis in the smooth muscle portion of the esophagus. 5. **Statement 5 (False):** While Achalasia is a premalignant condition, the most common associated cancer is **Squamous Cell Carcinoma** (due to chronic stasis and irritation), not Adenocarcinoma (which is associated with GERD/Barrett’s). ### **Clinical Pearls for NEET-PG** * **Investigation of Choice:** Esophageal Manometry. * **Initial Investigation:** Barium Swallow. * **To Rule out Pseudo-achalasia (Malignancy):** Upper GI Endoscopy. * **Treatment of Choice:** Laparoscopic Heller’s Myotomy with partial fundoplication (Dor or Toupet). * **POEM (Per-Oral Endoscopic Myotomy):** A newer, scarless endoscopic treatment option.

Question 797: What is the common site of regional enteritis?

A. Colon
B. Rectum
C. Distal ileum and colon (Correct Answer)
D. Caecum

Explanation: **Explanation:** Regional enteritis, commonly known as **Crohn’s Disease**, is a chronic inflammatory bowel disease characterized by transmural inflammation that can affect any part of the gastrointestinal tract from the mouth to the anus. **Why the correct answer is right:** The most common site of involvement in Crohn’s disease is the **distal (terminal) ileum and the proximal colon** (ileocolic region), seen in approximately 40–50% of patients. While it can occur in isolation in the small bowel (30%) or colon (20%), the combined involvement of the terminal ileum and the right side of the colon is the classic and most frequent presentation. **Why the incorrect options are wrong:** * **A & D (Colon/Caecum):** While the colon and caecum are frequently involved, isolated colonic involvement (Crohn’s colitis) is less common than ileocolic involvement. * **B (Rectum):** The rectum is typically **spared** in Crohn’s disease (unlike Ulcerative Colitis, where it is always involved). This "rectal sparing" is a key diagnostic differentiator. **High-Yield Clinical Pearls for NEET-PG:** * **Skip Lesions:** Crohn’s is characterized by discontinuous areas of inflammation with normal intervening mucosa. * **Transmural Inflammation:** Leads to complications like fistulae, strictures, and "creeping fat" (mesenteric fat wrapping around the bowel). * **Microscopy:** Non-caseating granulomas are pathognomonic (seen in ~50% of cases). * **Cobblestone Appearance:** Formed by deep longitudinal and transverse ulcers. * **String Sign of Kantor:** A classic radiological finding on barium swallow representing terminal ileal stricture.

Question 798: All of the following are indications for surgery in a case of duodenal ulcer except?

A. Acute perforation of ulcer
B. Pyloric stenosis
C. Massive haemorrhage
D. Multiple large ulcers (Correct Answer)

Explanation: In modern surgical practice, the management of Duodenal Ulcers (DU) has shifted from elective procedures to the management of life-threatening complications, primarily due to the efficacy of Proton Pump Inhibitors (PPIs) and *H. pylori* eradication therapy. ### **Explanation of the Correct Option** **D. Multiple large ulcers:** The presence of multiple or large ulcers is **not** an absolute indication for surgery. These are typically managed medically with aggressive acid suppression and *H. pylori* testing. While multiple ulcers (especially in unusual locations) should raise suspicion for **Zollinger-Ellison Syndrome (Gastrinoma)**, the primary treatment remains medical or targeted at the underlying tumor, not the ulcers themselves. ### **Analysis of Incorrect Options (Indications for Surgery)** * **A. Acute perforation:** This is an absolute surgical emergency. The standard treatment is a **Graham’s Omental Patch repair** (laparoscopic or open). * **B. Pyloric stenosis:** Chronic duodenal ulcers can lead to scarring and cicatricial contraction, causing Gastric Outlet Obstruction (GOO). Surgery (e.g., Truncal Vagotomy with Antrectomy or Gastrojejunostomy) is required to bypass the mechanical obstruction. * **C. Massive haemorrhage:** Surgery is indicated if endoscopic intervention (clips, adrenaline injection, or thermal coagulation) fails to achieve hemostasis or if the patient remains hemodynamically unstable despite resuscitation. ### **NEET-PG High-Yield Pearls** * **Most common complication of DU:** Hemorrhage (specifically from the gastroduodenal artery in posterior ulcers). * **Most common indication for surgery:** Perforation (anterior ulcers are more likely to perforate). * **Surgery of choice for DU with GOO:** Truncal Vagotomy and Antrectomy (lowest recurrence rate) or Vagotomy and Drainage (Gastrojejunostomy). * **Rule of thumb:** Surgery is reserved for the "4 Complications": **P**erforation, **O**bstruction (stenosis), **H**emorrhage, and **I**ntractability (failure of medical therapy).

Question 799: Which of the following statements about carcinoid of the appendix is NOT TRUE?

A. Arises from argentaffin tissue.
B. Cells express S-100.
C. Frequently metastasizes. (Correct Answer)
D. Common at the tip.

Explanation: **Explanation:** Carcinoid tumors (Neuroendocrine tumors) are the most common primary tumors of the appendix. Understanding their behavior is crucial for NEET-PG, as management depends heavily on size and location. **Why Option C is NOT TRUE:** Appendiceal carcinoids are generally **indolent** and have a very low potential for malignancy. Metastasis is extremely rare, occurring in less than 2% of cases, and is typically only seen in tumors larger than 2 cm. Because they rarely spread, simple appendectomy is curative for most patients. **Analysis of Other Options:** * **Option A (Arises from argentaffin tissue):** This is true. These tumors originate from the subepithelial **Kulchitsky cells** (argentaffin cells) located in the crypts of Lieberkühn. * **Option B (Cells express S-100):** This is true. While primarily neuroendocrine (expressing Chromogranin and Synaptophysin), appendiceal carcinoids often show positivity for **S-100 protein**, particularly in the sustentacular cells or due to their origin from the subepithelial nerve plexus. * **Option D (Common at the tip):** This is true. Approximately **70-75%** of appendiceal carcinoids are located at the **distal tip**, where they are often found incidentally during appendectomy. **High-Yield Clinical Pearls for NEET-PG:** 1. **Size Criteria for Surgery:** * **<1 cm:** Appendectomy is sufficient. * **1–2 cm:** Appendectomy is usually sufficient unless the tumor is at the base or involves the mesoappendix. * **>2 cm:** Requires **Right Hemicolectomy** due to increased risk of nodal metastasis. 2. **Carcinoid Syndrome:** Very rare in appendiceal carcinoids unless there are extensive liver metastases (as the liver metabolizes serotonin via the portal circulation). 3. **Most common site of GI Carcinoid:** Historically the appendix, but recent data suggests the **small intestine (ileum)** is now the most common site.

Question 800: An elderly patient presents with a prolonged history of weakness and lethargy. On examination, he is found to be anemic and stool is positive for occult blood. Which of the following is the investigation of choice?

A. Colonoscopy (Correct Answer)
B. Barium meal
C. Barium enema
D. CT abdomen

Explanation: **Explanation:** The clinical presentation of an elderly patient with weakness, lethargy, anemia, and stool positive for occult blood is highly suggestive of **Right-sided Colon Cancer** until proven otherwise. In an elderly individual, iron deficiency anemia (IDA) without an obvious cause must be investigated for gastrointestinal malignancy. **1. Why Colonoscopy is the Investigation of Choice:** Colonoscopy is the gold standard because it allows for **direct visualization** of the entire colon (from rectum to cecum) and provides the opportunity for **tissue biopsy**, which is essential for a definitive histopathological diagnosis. It has a higher sensitivity and specificity for detecting small polyps and early-stage cancers compared to imaging. **2. Why other options are incorrect:** * **Barium meal:** This evaluates the upper GI tract (esophagus, stomach, duodenum). While upper GI bleeds can cause anemia, the priority in an elderly patient with occult blood is to rule out colonic malignancy. * **Barium enema:** Although it can detect "apple-core" lesions, it has a lower sensitivity for small lesions and flat polyps. It is also purely diagnostic and requires a follow-up colonoscopy for biopsy if an abnormality is found. * **CT Abdomen:** While useful for staging (detecting metastasis or local invasion), it is not the primary diagnostic tool for intraluminal mucosal lesions and cannot provide a biopsy. **Clinical Pearls for NEET-PG:** * **Rule of Thumb:** Any male or post-menopausal female with unexplained iron deficiency anemia requires a colonoscopy. * **Right vs. Left Colon Cancer:** Right-sided lesions (Cecum/Ascending colon) typically present with **anemia and occult blood**, whereas left-sided lesions present with **altered bowel habits and obstruction**. * **CEA (Carcinoembryonic Antigen):** Not used for screening/diagnosis; it is used for monitoring recurrence post-surgery.

Practice by Chapter

Esophageal Disorders

Practice Questions

Gastric Disorders

Practice Questions

Small Intestine Pathology

Practice Questions

Appendicitis

Practice Questions

Inflammatory Bowel Disease

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Intestinal Obstruction

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Diverticular Disease

Practice Questions

Anorectal Disorders

Practice Questions

Colorectal Neoplasms

Practice Questions

Gastrointestinal Stomas

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Bariatric Surgery Principles

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