Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 301: What is true about Peutz-Jeghers syndrome?

A. Pigmentary changes in skin and mucous membrane around the mouth (Correct Answer)
B. Adenomatous polyps in the intestine
C. The most common pattern of inheritance is autosomal recessive
D. 20-30% are premalignant

Explanation: **Peutz-Jeghers Syndrome (PJS)** is an autosomal dominant condition characterized by the association of gastrointestinal polyposis and mucocutaneous hyperpigmentation. ### **Explanation of Options** * **A (Correct):** The hallmark of PJS is **melanocytic macules** (dark brown/blue spots) found typically on the lips, perioral area, buccal mucosa, palms, and soles. These often appear in infancy and may fade after puberty, except for those on the buccal mucosa, which tend to persist. * **B (Incorrect):** The polyps in PJS are **hamartomatous**, not adenomatous. They are characterized histologically by a "Christmas tree" appearance due to the branching of smooth muscle into the lamina propria. * **C (Incorrect):** PJS follows an **autosomal dominant** inheritance pattern, primarily due to a germline mutation in the **STK11 (LKB1)** tumor suppressor gene on chromosome 19p13.3. * **D (Incorrect):** While the polyps themselves have low malignant potential, the **cumulative lifetime risk of cancer** in PJS patients is extremely high (up to **93%**). This includes both GI cancers (colorectal, gastric, pancreatic) and extra-intestinal cancers (breast, ovary, cervix, and Sertoli cell tumors of the testes). ### **High-Yield Clinical Pearls for NEET-PG** * **Most common site of polyps:** Small intestine (specifically the **jejunum**), followed by the colon and stomach. * **Most common complication:** Recurrent **intussusception** (often leading to "bowel-sparing" surgical interventions). * **Diagnostic Criteria:** Requires histologically confirmed hamartomatous polyps plus at least two of the following: family history, mucocutaneous hyperpigmentation, or small bowel polyposis. * **Surveillance:** Regular screening via upper GI endoscopy, colonoscopy, and capsule endoscopy/MRCP is mandatory starting in late childhood.

Question 302: An X-ray of the abdomen reveals a specific finding. Identify the finding and its associated pathology:

A. Bird beak sign - Achalasia
B. Coffee bean sign - Cecal volvulus
C. Coffee bean sign - Sigmoid volvulus (Correct Answer)
D. Bird of prey sign - Sigmoid volvulus

Explanation: ***Coffee bean sign - Sigmoid volvulus*** - The **coffee bean sign** on plain abdominal X-ray is **pathognomonic** for sigmoid volvulus, showing a characteristic dilated sigmoid loop resembling a coffee bean. - This finding represents **twisted sigmoid colon** with air-fluid levels, typically seen in the **left upper quadrant** extending toward the right side. *Bird beak sign - Achalasia* - The **bird beak sign** is seen on **barium swallow studies**, not plain abdominal X-rays, showing narrowed gastroesophageal junction. - This finding is specific to **achalasia** involving the **esophagus**, not intestinal pathology visible on abdominal radiographs. *Coffee bean sign - Cecal volvulus* - **Cecal volvulus** typically presents with a **dilated cecum** in the left upper quadrant, but lacks the characteristic coffee bean configuration. - The radiographic appearance is more of a **kidney-shaped** or **comma-shaped** dilated bowel loop rather than the coffee bean sign. *Bird of prey sign - Sigmoid volvulus* - The **bird of prey sign** is a **barium enema** finding, not visible on plain abdominal X-rays. - This sign shows the **twisted point** of sigmoid volvulus on contrast studies, appearing like a bird's beak, but requires contrast enhancement to visualize.

Question 303: Which of the following is NOT true about appendicular rupture?

A. It is common in extremes of age.
B. It is common in individuals with fecalith obstruction.
C. Early antibiotics prevent rupture. (Correct Answer)
D. Appendectomy is always performed in the presence of rupture.

Explanation: **Explanation:** The correct answer is **C**. While antibiotics are a crucial part of the management of appendicitis, they **do not prevent rupture** if the underlying cause is a mechanical luminal obstruction. Appendicular rupture is primarily a mechanical process: obstruction leads to increased intraluminal pressure, which compromises venous and then arterial supply, resulting in gangrene and perforation. Antibiotics cannot reverse this mechanical progression. **Analysis of Options:** * **Option A:** True. Extremes of age (very young and elderly) are at higher risk. Children have a thin appendiceal wall and an underdeveloped omentum, while the elderly often present late due to vague symptoms and have age-related vascular compromise. * **Option B:** True. A fecalith (appendicolith) is the most common cause of luminal obstruction. Its presence is strongly associated with a higher risk of gangrene and early perforation compared to non-obstructive appendicitis. * **Option D:** True (in the context of standard surgical teaching). While "interval appendectomy" is a debated topic for stable appendicular masses, the standard surgical principle for a ruptured appendix with generalized peritonitis is immediate appendectomy and peritoneal lavage. **High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Rupture typically occurs 24–48 hours after the onset of symptoms. * **Site:** The most common site of perforation is the **antimesenteric border**, just distal to the site of obstruction (the point of poorest blood supply). * **Clinical Sign:** A sudden, temporary relief of pain followed by worsening generalized abdominal pain and high-grade fever often indicates that the appendix has ruptured. * **Diagnosis:** Contrast-Enhanced CT (CECT) is the gold standard for diagnosing complications like perforation or abscess.

Question 304: What permanent deleterious effects are seen if 25% of the small intestine is resected?

A. Diarrhea (Correct Answer)
B. Fat malabsorption syndrome
C. Intestinal failure
D. None

Explanation: The small intestine possesses a remarkable functional reserve. In an average adult, the small intestine measures approximately 6 meters. Clinical consequences of resection depend entirely on the **extent** and **site** of the segment removed. **1. Why Diarrhea is the Correct Answer:** Resection of 25% of the small intestine (approximately 1.5 meters) is generally well-tolerated without causing global malabsorption. However, it frequently leads to **diarrhea**. This occurs due to: * **Decreased Transit Time:** A shorter bowel increases the speed of bolus movement. * **Bile Acid Malabsorption:** If the resection involves the terminal ileum, bile salts enter the colon, stimulating water and electrolyte secretion (choleretic diarrhea). * **Reduced Surface Area:** Even minor reductions can slightly decrease the compensatory capacity for fluid absorption. **2. Why Other Options are Incorrect:** * **B. Fat Malabsorption Syndrome:** This typically requires resection of >50% of the small intestine or significant loss of the terminal ileum (where bile salts are recycled). At 25%, the remaining 75% compensates for nutrient absorption. * **C. Intestinal Failure:** This is defined as the inability to maintain protein-energy, fluid, electrolyte, or micronutrient balance. It usually occurs when **<100 cm** of the small bowel remains (Short Bowel Syndrome). A 25% resection leaves ~450 cm, which is far above the threshold for failure. * **D. None:** While the body compensates well, the physiological change in transit and bile acid handling almost always results in altered bowel habits (diarrhea). **NEET-PG High-Yield Pearls:** * **Short Bowel Syndrome (SBS):** Usually occurs when <2 meters of the small intestine remains. * **The "Rule of 100":** Patients with <100 cm of small bowel usually require parenteral nutrition. * **Critical Site:** The **Ileocecal Valve** is the most important landmark; its preservation significantly improves outcomes by preventing bacterial overgrowth and slowing transit. * **Adaptation:** Following resection, the remaining bowel undergoes "intestinal adaptation" (villous hypertrophy) over 1–2 years.

Question 305: Hiatus hernia is treated by:

A. Surgery when medical treatment has failed
B. Nissens' fundoplication (Correct Answer)
C. Medical treatment only
D. None of the above

Explanation: **Explanation:** Hiatal hernia occurs when the upper part of the stomach protrudes through the esophageal hiatus of the diaphragm. The definitive management for symptomatic hiatal hernias, particularly those associated with Gastroesophageal Reflux Disease (GERD) or paraesophageal types, is surgical correction. **Why Nissen’s Fundoplication is Correct:** **Nissen’s Fundoplication (360° wrap)** is the gold standard surgical procedure for hiatal hernia and GERD. It involves mobilizing the lower esophagus and wrapping the gastric fundus completely around the distal esophagus. This reinforces the Lower Esophageal Sphincter (LES) pressure, prevents acid reflux, and anchors the stomach below the diaphragm after the hiatal defect is repaired (crural repair). **Analysis of Incorrect Options:** * **Option A:** While surgery is often indicated after medical failure in GERD, the question asks for the specific *treatment* of the hernia itself. Anatomical defects like hiatal hernias cannot be "cured" by medicine; surgery is the definitive corrective method. * **Option C:** Medical treatment (PPIs, lifestyle changes) only manages the symptoms of reflux but does not address the mechanical herniation or the risk of incarceration/strangulation seen in paraesophageal hernias. **High-Yield Clinical Pearls for NEET-PG:** * **Types:** Type I (Sliding) is most common (95%); Type II-IV are Paraesophageal. * **Indications:** All symptomatic paraesophageal hernias should be operated on due to the risk of gastric volvulus. * **Other Wraps:** **Toupet** (270° posterior wrap) and **Dor** (180-200° anterior wrap) are used if esophageal motility is poor to prevent postoperative dysphagia. * **Complication:** "Gas bloat syndrome" is a known side effect of a wrap that is too tight.

Question 306: What is the earliest manifestation observed after a gastrectomy?

A. Increased incidence of infection
B. Loss of storage capacity (Correct Answer)
C. Loss of hydrochloric acid
D. Loss of intrinsic factor

Explanation: ### Explanation The stomach serves three primary functions: **storage (reservoir)**, **mechanical digestion (churning)**, and **chemical secretion** (HCl, Pepsin, and Intrinsic Factor). **Why "Loss of storage capacity" is correct:** The stomach’s most immediate physiological role upon the ingestion of food is its "reservoir function," facilitated by **receptive relaxation**. When a gastrectomy (partial or total) is performed, this reservoir is physically removed or significantly reduced. This is the **earliest manifestation** because it occurs the very first time the patient attempts to ingest a meal post-operatively. The loss of this capacity leads to early satiety and is the primary trigger for **Dumping Syndrome**, where hyperosmolar food boluses enter the small intestine too rapidly. **Analysis of Incorrect Options:** * **A. Increased incidence of infection:** While the loss of gastric acid (which is bactericidal) can lead to bacterial overgrowth in the long term, it is not the earliest manifestation. * **C. Loss of hydrochloric acid:** While HCl secretion stops immediately after total gastrectomy, its clinical manifestation (achlorhydria or impaired iron absorption) takes time to become symptomatic compared to the immediate loss of volume. * **D. Loss of intrinsic factor:** Intrinsic factor is essential for Vitamin B12 absorption. However, the body has significant hepatic stores of Vitamin B12 (lasting 3–5 years). Therefore, megaloblastic anemia is a **late manifestation** of gastrectomy. **NEET-PG High-Yield Pearls:** * **Dumping Syndrome:** The most common post-gastrectomy complication. Early dumping (15–30 mins) is due to osmotic fluid shift; Late dumping (1–3 hours) is due to reactive hypoglycemia. * **Anemia post-gastrectomy:** Most common is **Iron deficiency anemia** (due to bypass of duodenum/loss of HCl), followed by **Vitamin B12 deficiency**. * **Metabolic Bone Disease:** Patients are at risk for osteomalacia and osteoporosis due to decreased calcium absorption.

Question 307: Which of the following statements is false regarding the Sengstaken-Blakemore tube?

A. Used to arrest acute variceal bleeding.
B. The gastric balloon should be inflated with 200-250 mL of air.
C. Pressure in the esophageal balloon is maintained at 60 mm Hg. (Correct Answer)
D. Endotracheal intubation prior to tube insertion reduces the risk of pulmonary aspiration.

Explanation: The **Sengstaken-Blakemore (SB) tube** is a triple-lumen device used for the emergency tamponade of bleeding esophageal and gastric varices. ### Why Option C is False The pressure in the esophageal balloon should be maintained between **30–45 mm Hg**. Maintaining a pressure of **60 mm Hg** is dangerously high and carries a significant risk of **esophageal necrosis or rupture**. The pressure should be monitored using a manometer and should be the minimum required to achieve hemostasis. ### Analysis of Other Options * **Option A:** The SB tube is a classic "bridge therapy" used to **arrest acute variceal bleeding** when pharmacological therapy (octreotide) and endoscopic band ligation (EBL) fail or are unavailable. * **Option B:** The gastric balloon acts as an anchor and compresses the gastroesophageal junction. It is typically inflated with **200–250 mL of air** (some protocols suggest up to 300 mL). It must be inflated *before* the esophageal balloon. * **Option C:** **Endotracheal intubation** is strongly recommended before insertion in patients with altered sensorium or massive hematemesis to protect the airway and **reduce the risk of pulmonary aspiration**. ### NEET-PG High-Yield Pearls * **Minnesota Tube:** A modification of the SB tube with a **fourth lumen** for suctioning secretions above the esophageal balloon. * **Maximum Duration:** The tube should not remain inflated for more than **24 hours** to prevent pressure necrosis. * **Safety Tip:** Always keep a pair of scissors at the bedside; if the tube migrates upward and causes airway obstruction, all ports must be cut immediately. * **Confirmation:** Always confirm the position of the gastric balloon via X-ray before full inflation to avoid inflating it in the esophagus.

Question 308: Which of the following is NOT true about hyperplastic tuberculosis?

A. Most common site is the ileo-caecal region.
B. Presents as a mass in the right iliac fossa.
C. Surgery is the treatment of choice. (Correct Answer)
D. Barium studies are characteristic.

Explanation: Abdominal tuberculosis primarily manifests in two forms: **ulcerative** (associated with malnutrition and poor immunity) and **hyperplastic** (associated with high host resistance). ### Why Option C is the Correct Answer (The "False" Statement) The primary treatment for hyperplastic tuberculosis is **Medical Management** using Anti-Tubercular Therapy (ATT) for 6–9 months. Surgery is **not** the treatment of choice; it is reserved only for complications such as intestinal obstruction, perforation, or fistula formation. Even when a mass is present, ATT often leads to significant regression. ### Analysis of Other Options * **Option A (Most common site is ileo-caecal):** This is **true**. The ileocaecal region is the most common site for intestinal TB due to the abundance of lymphoid tissue (Peyer's patches), physiological stasis, and increased absorption of water which allows the bacilli to stay in contact with the mucosa longer. * **Option B (Mass in right iliac fossa):** This is **true**. Hyperplastic TB causes significant thickening of the bowel wall and mesenteric lymphadenopathy, typically presenting as a firm, non-tender, mobile mass in the Right Iliac Fossa (RIF). * **Option C (Barium studies are characteristic):** This is **true**. Classic radiological signs include the **Stierlin sign** (rapid emptying of the inflamed segment), **Fleischner sign** (inverted umbrella appearance of the ileocaecal valve), and the **Goose-neck deformity**. ### Clinical Pearls for NEET-PG * **Differential Diagnosis:** The most important differential for hyperplastic TB is **Crohn’s Disease** and **Carcinoma Caecum**. * **Surgical Procedures:** If surgery is required for obstruction, the procedure of choice is **Limited Resection** (e.g., limited ileocaecal resection). Historically, bypass procedures like ileotransverse colostomy were done but are now avoided due to "blind loop syndrome." * **Pathology:** Hyperplastic TB is characterized by a "cobblestone" appearance and transmural inflammation, but unlike Crohn's, it features **caseating granulomas**.

Question 309: What is the most common complication of achalasia?

A. Recurrent pulmonary infections (Correct Answer)
B. Stricture of esophagus
C. Pleurisy
D. Peptic ulcer

Explanation: **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 esophageal peristalsis. This leads to the progressive stasis of undigested food and saliva within a dilated esophagus. **Why Recurrent Pulmonary Infections is correct:** The most common complication of achalasia is **recurrent pulmonary infections** (aspiration pneumonia). Due to the aperistalsis and LES obstruction, food contents remain in the esophagus. When the patient lies flat (especially at night), this stagnant material regurgitates into the pharynx and is subsequently aspirated into the tracheobronchial tree. This leads to chronic cough, nocturnal choking, aspiration pneumonia, and potentially bronchiectasis or lung abscess. **Analysis of Incorrect Options:** * **B. Stricture of esophagus:** While long-standing inflammation can occur, strictures are more characteristic of Gastroesophageal Reflux Disease (GERD) or corrosive injury. In achalasia, the "narrowing" seen on imaging is functional (spasm), not a fixed fibrotic stricture. * **C. Pleurisy:** This is an inflammation of the pleural sheets. While it can occur secondary to severe pneumonia, it is not a direct or common complication of achalasia itself. * **D. Peptic ulcer:** Achalasia involves the esophagus; peptic ulcers occur in the stomach or duodenum. There is no direct pathophysiological link between achalasia and acid-peptic disease. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Barium Swallow Finding:** "Bird’s beak" or "Rat-tail" appearance. * **Most Common Symptom:** Dysphagia to both solids and liquids (often starting simultaneously). * **Malignancy Risk:** Long-standing achalasia increases the risk of **Squamous Cell Carcinoma** of the esophagus due to chronic irritation from food stasis. * **Treatment of Choice:** Laparoscopic Heller’s Myotomy with partial fundoplication.

Question 310: High-resolution manometry is the investigation of choice in all except:

A. Achalasia cardia
B. Diffuse esophageal spasm (DES)
C. Gastroesophageal reflux disease (GERD) (Correct Answer)
D. Nutcracker syndrome

Explanation: **Explanation:** High-resolution manometry (HRM) is the **gold standard** for assessing esophageal motor function. It measures the pressure and coordination of esophageal contractions and the relaxation of the lower esophageal sphincter (LES). **Why GERD is the correct answer:** The diagnosis of **Gastroesophageal Reflux Disease (GERD)** is primarily clinical, supported by **24-hour ambulatory pH monitoring** (the gold standard for diagnosis) and Upper GI Endoscopy (to check for complications like Barrett’s or esophagitis). While manometry is performed *before* anti-reflux surgery to rule out motility disorders (like Achalasia) and to locate the LES for pH probe placement, it is **not** the investigation of choice for diagnosing GERD itself. **Why the other options are incorrect:** * **Achalasia Cardia:** HRM is the investigation of choice. It shows incomplete LES relaxation (Integrated Relaxation Pressure >15 mmHg) and aperistalsis. * **Diffuse Esophageal Spasm (DES):** HRM is the investigation of choice, characterized by "corkscrew esophagus" on barium swallow and premature contractions (reduced Distal Latency) on manometry. * **Nutcracker Esophagus (Jackhammer Esophagus):** HRM is the investigation of choice, showing high-amplitude peristaltic contractions (Distal Contractile Integral >8000 mmHg·s·cm). **Clinical Pearls for NEET-PG:** * **Gold Standard for GERD:** 24-hour pH monitoring (DeMeester Score). * **Gold Standard for Motility Disorders:** High-Resolution Manometry (Chicago Classification). * **Bird’s Beak Appearance:** Classic radiological sign of Achalasia Cardia. * **Heller’s Myotomy:** The surgical treatment of choice for Achalasia, usually combined with a partial fundoplication.

Practice by Chapter

Esophageal Disorders

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Gastric Disorders

Practice Questions

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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