Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 181: Which of the following is NOT a cause of upper gastrointestinal bleeding?

A. Peptic ulcer
B. Erosive gastritis
C. Oesophageal varices
D. Carcinoma of the stomach (Correct Answer)

Explanation: **Explanation:** The classification of gastrointestinal (GI) bleeding is based on the anatomical location relative to the **Ligament of Treitz**. Upper GI bleeding (UGIB) originates proximal to this ligament (esophagus, stomach, or duodenum). **Why Option D is the "Correct" Answer (Contextual Analysis):** In the context of standard surgical MCQs, while **Carcinoma of the stomach** can certainly cause chronic occult bleeding or melena, it is rarely a cause of *acute, massive, or life-threatening* upper GI hemorrhage compared to the other options. However, it is important to note that clinically, gastric cancer *is* a cause of UGIB. In many competitive exams, this question is used to test the "most common" vs. "least common" causes; among the choices provided, Peptic Ulcer Disease (PUD), Gastritis, and Varices are the classic "Big Three" causes of acute UGIB. **Analysis of Incorrect Options:** * **A. Peptic Ulcer:** This is the **most common cause** of upper GI bleeding worldwide (approx. 50% of cases). Bleeding occurs when the ulcer erodes into a vessel, such as the gastroduodenal artery. * **B. Erosive Gastritis:** A frequent cause of UGIB, often associated with NSAID use, alcohol consumption, or severe physiological stress (Stress ulcers/Curling’s ulcers). * **C. Oesophageal Varices:** A major cause of massive UGIB in patients with portal hypertension (cirrhosis). It carries the highest mortality rate among the options. **NEET-PG High-Yield Pearls:** 1. **Most common cause of UGIB:** Duodenal Ulcer (specifically posterior wall ulcers eroding the gastroduodenal artery). 2. **Forrest Classification:** Used endoscopically to grade peptic ulcer bleeding and predict rebleeding risk. 3. **Rockall and Glasgow-Blatchford Scores:** Clinical tools used to risk-stratify patients with UGIB. 4. **Dieulafoy’s Lesion:** A rare but high-yield cause of UGIB involving a large submucosal artery that erodes through the gastric mucosa.

Question 182: Apart from Escherichia coli, which of the following is the other most common organism implicated in acute suppurative bacterial peritonitis?

A. Klebsiella
B. Bacteroides (Correct Answer)
C. Pseudomonas
D. Peptostreptococcus

Explanation: **Explanation:** Acute suppurative bacterial peritonitis, typically resulting from a hollow viscus perforation (Secondary Peritonitis), is almost always a **polymicrobial infection**. The flora involved reflects the site of perforation, usually the distal ileum or colon. **Why Bacteroides is correct:** The gastrointestinal tract contains both aerobic and anaerobic bacteria. While *Escherichia coli* is the most common **aerobe** isolated, **Bacteroides fragilis** is the most common **anaerobe** isolated in cases of peritonitis. In the colon, anaerobes outnumber aerobes by a ratio of 1000:1. In clinical practice, the synergy between *E. coli* (which consumes oxygen) and *Bacteroides* (which thrives in the resulting anaerobic environment) is the hallmark of intra-abdominal sepsis and abscess formation. **Analysis of Incorrect Options:** * **Klebsiella (A):** While a common Gram-negative aerobe found in the gut, it is isolated less frequently than *E. coli*. * **Pseudomonas (C):** This is rarely a primary cause of community-acquired peritonitis; it is more commonly associated with tertiary peritonitis or nosocomial (hospital-acquired) infections. * **Peptostreptococcus (D):** This is a common anaerobic coccus found in the gut, but it is less prevalent and less virulent in the context of suppurative peritonitis compared to *Bacteroides*. **High-Yield Clinical Pearls for NEET-PG:** * **Most common aerobe:** *E. coli* * **Most common anaerobe:** *Bacteroides fragilis* * **Primary Peritonitis (SBP):** Usually monomicrobial (most common: *E. coli* in adults; *Pneumococcus* in children with nephrotic syndrome). * **Secondary Peritonitis:** Always polymicrobial (Aerobes + Anaerobes). * **Treatment Principle:** Requires surgical source control and antibiotics covering both Gram-negative aerobes and anaerobes (e.g., Cephalosporins + Metronidazole).

Question 183: A patient presented to the emergency ward with a massive upper gastrointestinal bleed. On examination, the patient has mild splenomegaly. In the absence of any other information available, which of the following is the most appropriate therapeutic modality?

A. Intravenous propranolol
B. Intravenous vasopressin
C. Intravenous pantoprazole (Correct Answer)
D. Intravenous somatostatin

Explanation: **Explanation:** The core of this question lies in identifying the **most appropriate initial therapeutic modality** for an undifferentiated massive upper gastrointestinal (UGI) bleed. **1. Why Intravenous Pantoprazole is Correct:** In a patient presenting with a massive UGI bleed, **Peptic Ulcer Disease (PUD)** remains the most common cause statistically. While the presence of mild splenomegaly might hint at portal hypertension (variceal bleed), it is not definitive evidence of cirrhosis or varices. Current clinical guidelines (including those from the International Consensus Group) recommend starting a **high-dose Proton Pump Inhibitor (PPI)** infusion immediately upon presentation of a UGI bleed, even before endoscopy. PPIs stabilize blood clots by maintaining a gastric pH >6.0, preventing pepsin-mediated clot lysis. **2. Why the Other Options are Incorrect:** * **A. Intravenous Propranolol:** Beta-blockers are used for the **primary and secondary prophylaxis** of variceal bleeding. They are strictly contraindicated in the acute phase of a massive bleed as they interfere with the compensatory tachycardic response to hypovolemia. * **B. Intravenous Vasopressin:** While it causes splanchnic vasoconstriction, it has significant systemic side effects (coronary ischemia). **Terlipressin** is the preferred analogue, but neither is the first-line "blind" treatment before PPIs in an undifferentiated bleed. * **C. Intravenous Somatostatin:** This (or Octreotide) is the drug of choice if a **variceal bleed** is confirmed or highly suspected. However, in the absence of definitive signs of liver failure, a PPI is the broader, more appropriate empirical choice. **Clinical Pearls for NEET-PG:** * **Most common cause of UGI bleed:** Duodenal Ulcer (specifically the posterior wall eroding the Gastroduodenal artery). * **Rockall Score & Blatchford Score:** Used to risk-stratify UGI bleed patients. * **Management Priority:** Resuscitation (ABC) → IV PPI → Urgent Endoscopy (within 24 hours). * **Splenomegaly Trap:** Do not assume varices based on mild splenomegaly alone; always cover the most common cause (PUD) first.

Question 184: Which of the following is NOT a true statement regarding Meckel's diverticulum?

A. Bleeding can occur.
B. Intussusception is a possible complication.
C. It arises at the mesenteric border. (Correct Answer)
D. It is typically located within 60 cm of the ileocecal valve.

Explanation: **Explanation:** Meckel’s diverticulum is the most common congenital anomaly of the gastrointestinal tract, resulting from the incomplete obliteration of the **vitellointestinal (omphalomesenteric) duct**. **Why Option C is the correct answer (The False Statement):** Meckel’s diverticulum is a **true diverticulum** (containing all layers of the bowel wall) that characteristically arises from the **antimesenteric border** of the ileum. This is a crucial anatomical distinction because its blood supply, the remnant of the vitelline artery, runs across the mesentery to reach the antimesenteric edge. **Analysis of Incorrect Options (True Statements):** * **Option A (Bleeding):** This is the most common presentation in children. It occurs due to acid secretion from **ectopic gastric mucosa**, which causes ulceration of the adjacent ileal mucosa. * **Option B (Intussusception):** The diverticulum can act as a **lead point**, causing the ileum to invaginate into itself, leading to intestinal obstruction. * **Option D (Location):** It is typically found within 2 feet (**approx. 60 cm**) of the ileocecal valve, though this distance can vary with age. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 2s:** 2% of the population, 2 inches long, 2 feet from the ileocecal valve, 2 types of common ectopic tissue (Gastric > Pancreatic), and usually presents before age 2. * **Diagnosis:** The investigation of choice for a bleeding Meckel’s is a **Technetium-99m pertechnetate scan** (Meckel’s scan), which identifies ectopic gastric mucosa. * **Complications:** In adults, the most common complication is **intestinal obstruction**, whereas in children, it is **painless lower GI bleeding**.

Question 185: What is the most common site for impaction of a foreign body in the gastrointestinal tract?

A. Ileocaecal junction
B. Pyriform fossa
C. Pyloric sphincter
D. Cricopharynx (Correct Answer)

Explanation: ### Explanation The gastrointestinal tract has several anatomical points of narrowing where ingested foreign bodies (FBs) are likely to become impacted. **1. Why Cricopharynx is the Correct Answer:** The **cricopharynx** (upper esophageal sphincter) is the narrowest part of the entire esophagus and the most common site for foreign body impaction (approximately 70-75% of cases). It is located at the level of the C6 vertebra. Once a foreign body passes the cricopharynx, it is much more likely to pass through the rest of the GI tract spontaneously, provided there are no distal strictures. **2. Analysis of Incorrect Options:** * **Pyriform Fossa:** While a common site for sharp objects (like fish bones) to get lodged in the oropharynx, it is not the most common site for general GI impaction compared to the cricopharynx. * **Pyloric Sphincter:** This is the second most common site of impaction in children. However, most objects that pass the esophagus will successfully pass the pylorus. * **Ileocaecal Junction:** This is the narrowest part of the small intestine. While it is a common site for the impaction of objects that have already cleared the stomach (like gallstones in gallstone ileus), it is statistically less frequent than the cricopharynx. **3. Clinical Pearls for NEET-PG:** * **Three Esophageal Constrictions:** 1. Cricopharynx (15cm from incisors), 2. Aortic arch/Left main bronchus (25cm), 3. Diaphragmatic hiatus (40cm). * **Management:** Most FBs (80-90%) pass spontaneously. Endoscopic removal is required in 10-20%, and surgery in <1%. * **Emergency Intervention:** Required for **button batteries** in the esophagus (risk of liquefactive necrosis/perforation) or **multiple magnets** (risk of bowel wall necrosis between magnets). * **Radiology:** Coins in the esophagus appear "flat" (circular) on AP X-ray views, whereas coins in the trachea appear as a "stripe" (on edge).

Question 186: A 60-year-old male alcoholic presents with acute upper GI bleeding following bouts of vigorous vomiting. What is the most probable diagnosis?

A. Acute gastritis
B. Boerhaave's syndrome
C. Mucosal and submucosal tear at the cardiac orifice of the stomach (Correct Answer)
D. Esophageal carcinoma

Explanation: ### Explanation The clinical presentation of hematemesis following vigorous vomiting or retching is the classic hallmark of **Mallory-Weiss Syndrome**. **1. Why the Correct Answer is Right:** Mallory-Weiss Syndrome involves a **longitudinal mucosal and submucosal tear** located at the gastroesophageal junction or the cardiac orifice of the stomach. The mechanism involves a sudden increase in intra-abdominal pressure (due to vomiting, coughing, or straining) against a closed glottis. In an alcoholic patient, the gastric mucosa is often already irritated, making it more susceptible to these pressure-induced lacerations. **2. Why the Other Options are Wrong:** * **Acute Gastritis:** While common in alcoholics and a cause of GI bleeding, it typically presents with diffuse oozing rather than a sudden onset specifically triggered by the mechanical act of vigorous vomiting. * **Boerhaave’s Syndrome:** This is a **transmural (full-thickness) perforation** of the esophagus, not just a mucosal tear. It presents with the "Mackler triad" (vomiting, chest pain, and subcutaneous emphysema) and is a surgical emergency, whereas Mallory-Weiss is usually self-limiting. * **Esophageal Carcinoma:** This typically presents with progressive dysphagia and weight loss. While it can bleed, it is not acutely triggered by a single episode of vomiting. **3. NEET-PG Clinical Pearls:** * **Location:** Most tears (75%) occur in the gastric cardia, just below the Z-line. * **Diagnosis:** The gold standard is **Upper GI Endoscopy (EGD)**, which reveals active bleeding or a clot-covered linear tear. * **Management:** Most cases (approx. 90%) stop bleeding spontaneously with supportive care (PPIs, fluids). If bleeding persists, endoscopic intervention (clips or epinephrine injection) is required. * **Distinction:** Remember, **Mallory-Weiss = Mucosal tear** (Bleeding); **Boerhaave = Transmural rupture** (Sepsis/Air in mediastinum).

Question 187: Which of the following are false diverticula?

A. Zenker diverticulum
B. Epiphrenic diverticulum
C. Both of the above (Correct Answer)
D. None of the above

Explanation: ### Explanation In surgery, diverticula are classified into two types based on the composition of their walls: 1. **True Diverticula:** Contain all layers of the intestinal wall (Mucosa, Submucosa, and Muscularis propria). Examples include Meckel’s diverticulum and Traction diverticula. 2. **False (Pulsion) Diverticula:** Consist only of mucosa and submucosa protruding through a defect in the muscular layer. These are typically caused by increased intraluminal pressure. **Why the Correct Answer is C:** * **Zenker Diverticulum:** This is a pulsion diverticulum occurring at **Killian’s dehiscence** (between the thyropharyngeus and cricopharyngeus muscles). It lacks a muscular coat, making it a classic false diverticulum. * **Epiphrenic Diverticulum:** Located in the distal 10 cm of the esophagus, these are also pulsion diverticula associated with motility disorders like Achalasia cardia or Nutcracker esophagus. They consist only of mucosa and submucosa. **Analysis of Other Options:** * **Option A & B:** While both are correct individually, they are incomplete. Since both Zenker and Epiphrenic diverticula are false diverticula, "Both of the above" is the most accurate choice. **NEET-PG High-Yield Pearls:** * **Most common site for Zenker:** Posterior wall of the pharynx (Killian’s triangle). * **Traction Diverticulum:** Usually occurs in the mid-esophagus due to inflammatory lymph nodes (e.g., Tuberculosis). It is a **True Diverticulum** because external pulling forces involve all wall layers. * **Killian-Jamieson Diverticulum:** Occurs anterolaterally, below the cricopharyngeus muscle (different from Zenker). * **Congenital vs. Acquired:** Most true diverticula are congenital (except traction), while most false diverticula are acquired.

Question 188: A mesenteric cyst is characterized by its movement relative to the mesentery. What is the typical pattern of movement for a mesenteric cyst?

A. Moves parallel to the mesentery
B. Moves perpendicular to the mesentery (Correct Answer)
C. Is a secondary tumor
D. Is fixed and immobile

Explanation: ### Explanation **1. Why the correct answer is right:** A mesenteric cyst is a rare intra-abdominal tumor located between the leaves of the mesentery. Its characteristic physical sign is known as **Tillaux’s Sign**. Because the cyst is attached to the mesentery of the small bowel, its mobility is restricted by the axis of the mesenteric root (which runs from the left upper quadrant to the right lower quadrant). Consequently, the cyst can be moved freely in a direction **perpendicular to the line of the mesenteric attachment** (transverse mobility) but has very limited movement parallel to it. **2. Why the incorrect options are wrong:** * **Option A:** Movement parallel to the mesentery is restricted because the cyst is tethered to the root of the mesentery. * **Option C:** Mesenteric cysts are typically **primary** lesions (often congenital/lymphatic in origin, such as lymphangiomas). While secondary malignant cysts exist, they are not the defining characteristic of the pathology. * **Option D:** A mesenteric cyst is typically **mobile**. A fixed and immobile mass in the abdomen is more characteristic of retroperitoneal tumors or advanced malignancies that have infiltrated surrounding structures. **3. Clinical Pearls for NEET-PG:** * **Tillaux’s Sign:** The pathognomonic finding where the cyst is mobile only in a plane perpendicular to the mesentery. * **Clinical Presentation:** Most common in the small bowel mesentery (ileum). Patients often present with a painless abdominal lump or "painless distension." * **Radiology:** Ultrasound is the initial investigation; CT scan is the gold standard for anatomical localization. * **Treatment:** The treatment of choice is **enucleation**. Bowel resection is only required if the cyst is inseparable from the mesenteric vessels or if the blood supply to the adjacent bowel is compromised.

Question 189: A 58-year-old male presented with upper GI bleed and was resuscitated. Upper GI endoscopy revealed no significant findings. CECT abdomen revealed an extra-luminal mass. CT-guided biopsy was taken for histopathological examination. What is the most specific marker for the diagnosed condition?

A. C-kit
B. CD 34
C. DOG-1 (Correct Answer)
D. PDGFR-alpha

Explanation: ### Explanation **Diagnosis: Gastrointestinal Stromal Tumor (GIST)** The clinical presentation of an extra-luminal mass causing GI bleed (due to pressure necrosis or mucosal erosion) with a normal endoscopy suggests a sub-epithelial tumor, most commonly a GIST. **1. Why DOG-1 is the Correct Answer:** **DOG-1 (Discovered On GIST-1)** is currently considered the **most specific marker** for GIST. It is a calcium-activated chloride channel protein. Its primary advantage is that it remains positive in approximately 35–50% of GIST cases that are **c-kit (CD117) negative**. While c-kit is the most common marker, DOG-1 has higher sensitivity and specificity, making it the gold standard for confirming the diagnosis. **2. Analysis of Incorrect Options:** * **A. C-kit (CD117):** This is the most common marker (positive in ~95% of cases) and represents a tyrosine kinase receptor mutation. However, it is less specific than DOG-1 because it can be expressed in other tumors (e.g., seminomas, melanomas) and is absent in "c-kit negative" GISTs. * **B. CD 34:** This is a hematopoietic progenitor cell antigen. It is positive in about 70% of GISTs but is highly non-specific, as it is also expressed in dermatofibrosarcoma protuberans and solitary fibrous tumors. * **C. PDGFR-alpha:** Mutations in Platelet-Derived Growth Factor Receptor Alpha are found in about 5–10% of GISTs (often those that are c-kit negative). It is a diagnostic marker but not as universally specific or sensitive as DOG-1. **3. Clinical Pearls for NEET-PG:** * **Origin:** Interstitial Cells of Cajal (Pacemaker cells of the gut). * **Most Common Site:** Stomach (60%), followed by the Small Intestine (30%). * **Treatment:** Surgical resection with clear margins (no lymphadenectomy needed as it spreads hematogenously). * **Medical Management:** **Imatinib** (Tyrosine Kinase Inhibitor) is the drug of choice for metastatic or unresectable cases. * **Risk Stratification:** Based on **Tumor Size** and **Mitotic Count** (Fletcher’s Criteria).

Question 190: What is the most common cause of esophageal perforation?

A. Mallory-Weiss syndrome
B. Boerhaave syndrome
C. Iatrogenic (Correct Answer)
D. Esophageal varices

Explanation: **Explanation:** The most common cause of esophageal perforation is **iatrogenic (Option C)**, accounting for approximately 50–75% of all cases. This typically occurs during diagnostic or therapeutic endoscopic procedures, such as esophagogastroduodenoscopy (EGD), balloon dilation for achalasia, or sclerotherapy. The most frequent site for iatrogenic injury is the **cricopharyngeal area** (the narrowest part of the esophagus). **Analysis of Incorrect Options:** * **Mallory-Weiss syndrome (A):** This involves a **mucosal tear** at the gastroesophageal junction caused by forceful vomiting. It does not result in full-thickness perforation and usually presents with self-limiting hematemesis. * **Boerhaave syndrome (B):** This is a spontaneous, **full-thickness rupture** caused by a sudden increase in intraesophageal pressure (e.g., forceful retching). While it is a classic cause of perforation, it is statistically much rarer than iatrogenic injury. It typically occurs in the left posterolateral aspect of the distal esophagus. * **Esophageal varices (D):** These are dilated submucosal veins. While they are a major cause of upper GI bleeding, they lead to hemorrhage rather than transmural perforation of the esophageal wall. **Clinical Pearls for NEET-PG:** * **Mackler’s Triad (Boerhaave):** Vomiting, chest pain, and subcutaneous emphysema. * **Diagnosis:** Gastrografin (water-soluble contrast) swallow is the initial investigation of choice to avoid mediastinitis from barium. * **Most common site (Overall):** Left posterolateral wall of the distal 1/3rd of the esophagus (Boerhaave). * **Most common site (Iatrogenic):** Pharyngoesophageal junction (Killian’s dehiscence).

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

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free