Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 851: Paralytic ileus is caused by which of the following conditions?

A. Peritonitis (Correct Answer)
B. Hyperkalemia
C. Acute intestinal obstruction
D. Head injury

Explanation: **Explanation:** **Paralytic ileus** is a state of functional intestinal obstruction where there is a failure of peristalsis without a physical mechanical barrier. **1. Why Peritonitis is Correct:** Peritonitis is one of the most common causes of paralytic ileus. Inflammation of the peritoneum (due to infection, bile, or gastric contents) triggers a **reflex inhibition** of the enteric nervous system. This leads to an overactivity of the sympathetic nervous system and the release of inflammatory mediators (like nitric oxide and prostaglandins) that paralyze the smooth muscles of the gut wall. **2. Analysis of Incorrect Options:** * **Hyperkalemia:** This is incorrect because **Hypokalemia** (low potassium) is a classic cause of paralytic ileus. Potassium is essential for the electrical conduction and contraction of smooth muscles; its deficiency leads to gut atony. * **Acute Intestinal Obstruction:** This refers to **mechanical** obstruction (e.g., adhesions, volvulus). In mechanical obstruction, bowel sounds are initially hyperactive (borborygmi), whereas in paralytic ileus, bowel sounds are characteristically absent or "silent." * **Head Injury:** While severe spinal cord injuries can cause ileus, isolated head injuries are not a primary cause. However, **hypokalemia** or **post-operative states** following neurosurgery might lead to it indirectly. **3. NEET-PG High-Yield Pearls:** * **Most common cause overall:** Post-operative state (Physiological ileus). * **Clinical Sign:** Distended abdomen with **absent bowel sounds** (Silent Abdomen). * **Radiology:** X-ray shows gas-filled loops in both the small and large intestines (unlike mechanical obstruction where gas is absent distal to the block). * **Electrolyte triggers:** Hypokalemia, Hypomagnesemia, and Hyponatremia. * **Drugs:** Opioids and Anticholinergics are common pharmacological causes.

Question 852: What is the treatment of choice for this patient?

A. Sigmoidoscopy
B. Resection with anastomosis (Correct Answer)
C. Conservative management
D. Hydrostatic enema

Explanation: ***Resection with anastomosis*** - **Adult intussusception** has a high association with **malignant lead points** (>90%), making surgical resection mandatory to address the underlying pathology. - **Gangrenous bowel** from prolonged obstruction requires immediate resection to prevent **perforation** and **sepsis**. *Sigmoidoscopy* - Used for **sigmoid volvulus decompression** but not effective for **intussusception** where the bowel is telescoped and obstructed. - Cannot address the underlying **malignant lead point** commonly present in adult intussusception cases. *Conservative management* - Inappropriate for **surgical GI emergencies** like intussusception where bowel viability is compromised. - Risk of **bowel perforation**, **necrosis**, and **septic shock** makes conservative approach dangerous. *Hydrostatic enema* - Effective only in **pediatric intussusception** where lead points are rare and reduction is often successful. - **Contraindicated in adults** due to high risk of **malignant lead points** and potential for **bowel perforation** during reduction attempts.

Question 853: What is typically NOT seen following a massive resection of the small bowel?

A. Hypogastrinemia
B. Vitamin B12 Deficiency
C. Malabsorption
D. None of the above (Correct Answer)

Explanation: **Explanation:** Massive resection of the small bowel leads to **Short Bowel Syndrome (SBS)**, a malabsorptive state occurring when there is insufficient functional small intestine to maintain nutrient and fluid homeostasis. **Why "None of the above" is correct:** The question asks what is **NOT** typically seen. However, all the listed conditions (A, B, and C) are classic complications of massive small bowel resection. Therefore, none of the options are incorrect findings. 1. **Hypergastrinemia (Addressing Option A):** Following massive resection, there is a loss of inhibitory hormones (like secretin and GIP) normally secreted by the small bowel. This leads to **gastric acid hypersecretion** and elevated gastrin levels. This can cause peptic ulcers and deactivate pancreatic enzymes due to low luminal pH. *Note: If the option were "Hypogastrinemia," it would be the correct answer as it is NOT seen; however, in many clinical contexts/standard texts, hypergastrinemia is the hallmark.* 2. **Vitamin B12 Deficiency (Addressing Option B):** Vitamin B12 is specifically absorbed in the **terminal ileum** via the intrinsic factor complex. Massive resections almost always involve the ileum, leading to megaloblastic anemia. 3. **Malabsorption (Addressing Option C):** This is the physiological hallmark of SBS. The reduction in mucosal surface area leads to decreased absorption of macronutrients (fats, proteins, carbohydrates) and micronutrients. **NEET-PG High-Yield Pearls:** * **Definition:** SBS usually occurs when <200 cm of viable small bowel remains in adults. * **Oxalate Stones:** Patients with SBS and an intact colon are at high risk for **calcium oxalate nephrolithiasis** because unabsorbed fats bind calcium, leaving oxalate free to be absorbed in the colon (Enteric Hyperoxaluria). * **Adaptation:** The remaining bowel undergoes "intestinal adaptation" (villous hypertrophy) over 1–2 years to increase absorptive capacity. * **Most Critical Site:** Loss of the **Ileocecal valve** significantly worsens prognosis as it leads to bacterial overgrowth (SIBO) and rapid transit.

Question 854: Entero-enteric fistula is found in all EXCEPT:

A. Crohn's disease
B. Colo-rectal malignancy
C. Actinomycosis
D. Ulcerative colitis (Correct Answer)

Explanation: **Explanation:** The core concept differentiating these conditions is the **depth of bowel wall involvement**. **Why Ulcerative Colitis (UC) is the correct answer:** Ulcerative colitis is primarily a **mucosal and submucosal disease**. It does not involve the full thickness of the bowel wall (transmural). Since fistula formation requires a transmural inflammatory process that breaches the serosa to adhere to and penetrate an adjacent loop of bowel, UC typically does not present with entero-enteric or any other types of fistulae. **Why the other options are incorrect:** * **Crohn’s Disease:** This is a **transmural** inflammatory condition. Deep fissuring ulcers (aphthous ulcers) penetrate through the serosa, leading to adhesions and fistula formation (entero-enteric, entero-vesical, or entero-cutaneous). This is a hallmark complication of Crohn’s. * **Colo-rectal Malignancy:** Advanced tumors can invade through the bowel wall into adjacent structures. Necrosis at the center of a locally invasive tumor can create a communication (fistula) between two loops of bowel. * **Actinomycosis:** Caused by *Actinomyces israelii*, this infection is known for causing "woody" induration and **multiple discharging sinuses/fistulae** that cross tissue planes, often involving the ileocecal region. **NEET-PG High-Yield Pearls:** * **Crohn’s vs. UC:** Crohn’s = Transmural (Fistulae common); UC = Mucosal (Fistulae rare). * **Toxic Megacolon:** While fistulae are rare in UC, toxic megacolon is a life-threatening complication seen more frequently in UC than in Crohn’s. * **Most common site for Crohn’s fistula:** Entero-enteric (between two loops of small bowel). * **Actinomycosis:** Look for "Sulfur granules" in the discharge and a history of dental procedures or appendicitis.

Question 855: Hourglass stomach is seen in which of the following conditions?

A. Gastric carcinoma
B. Gastric ulcer (Correct Answer)
C. Gastric Lymphoma
D. Corrosive strictures

Explanation: **Explanation:** The **Hourglass stomach** is a classic radiological and pathological finding most commonly associated with a **chronic gastric ulcer**, typically located on the **lesser curvature**. **1. Why Gastric Ulcer is correct:** The deformity occurs due to chronic cicatrization (scarring) and fibrosis of a gastric ulcer. As the ulcer heals, the fibrous tissue contracts, pulling the greater curvature towards the lesser curvature. This creates a central constriction that divides the stomach into two distinct pouches (upper and lower), resembling an hourglass. This is specifically seen in chronic benign peptic ulcers. **2. Analysis of Incorrect Options:** * **Gastric Carcinoma:** Typically presents with a "Leather bottle stomach" (**Linitis Plastica**) due to diffuse infiltration of the submucosa, leading to a rigid, non-distensible stomach rather than a localized hourglass constriction. * **Gastric Lymphoma:** Usually presents as bulky masses, thickened rugal folds, or multiple ulcerations, but does not typically cause the specific symmetrical cicatrization seen in hourglass deformity. * **Corrosive Strictures:** Ingestion of acids or alkalis usually leads to **pyloric stenosis** or antral narrowing because the corrosive agent pools in the prepyloric region. While it causes strictures, it rarely results in the classic "hourglass" shape of the mid-body. **Clinical Pearls for NEET-PG:** * **Linitis Plastica:** Associated with diffuse-type gastric adenocarcinoma (Signet ring cells). * **Tea-pot deformity:** Also seen in gastric ulcers due to shortening of the lesser curvature. * **Steer-horn stomach:** A normal anatomical variant (hypersthenic habitus) where the stomach is high and transverse. * **Cup-and-spill (Cascade) stomach:** A functional or structural deformity where the fundus folds posteriorly, often seen on barium swallow.

Question 856: Post-vagotomy diarrhea can be effectively managed by which of the following?

A. Steroids
B. Thyroxin
C. Somatostatin analogue (Correct Answer)
D. Parathormone

Explanation: **Explanation:** Post-vagotomy diarrhea is a common complication following truncal vagotomy (occurring in approximately 5–10% of patients). It is characterized by rapid gastric emptying and an increased flow of bile acids into the colon, leading to osmotic and secretory diarrhea. **Why Somatostatin Analogue is Correct:** **Octreotide** (a long-acting somatostatin analogue) is the pharmacological treatment of choice for refractory cases. It works by: 1. **Inhibiting the release of gastrointestinal hormones** (like serotonin, gastrin, and VIP) that stimulate secretion. 2. **Slowing gastrointestinal transit time** and delaying gastric emptying. 3. **Reducing intestinal fluid and electrolyte secretion**, thereby firming the stool. **Why Other Options are Incorrect:** * **A. Steroids:** These are used for inflammatory conditions (like IBD) but have no role in the functional/motility changes seen after vagotomy. * **B. Thyroxin:** Excess thyroxin actually increases gut motility and would worsen diarrhea. * **D. Parathormone:** PTH regulates calcium homeostasis and has no direct effect on post-surgical gastric motility or secretory diarrhea. **NEET-PG High-Yield Pearls:** * **First-line management:** Conservative measures including small, frequent, dry meals (low carbohydrate, high protein) and anti-diarrheals like **Loperamide** or **Cholestyramine** (to bind bile acids). * **Surgical management:** If medical therapy fails, the procedure of choice is the interposition of a **10 cm reversed jejunal segment** (anti-peristaltic loop) in the proximal jejunum. * **Incidence:** Post-vagotomy diarrhea is most common after **Truncal Vagotomy** and least common after Highly Selective Vagotomy (HSV).

Question 857: What is the most appropriate management for advanced stage rectal carcinoma?

A. Anterior resection
B. Abdominoperineal resection (Correct Answer)
C. Proximal colostomy
D. Ileostomy

Explanation: **Explanation:** The management of rectal carcinoma is primarily determined by the tumor's distance from the anal verge and the stage of the disease. **Why Abdominoperineal Resection (APR) is correct:** In **advanced stage rectal carcinoma**, particularly when the tumor is located in the lower third of the rectum (less than 5 cm from the anal verge) or involves the anal sphincter complex, **Abdominoperineal Resection (Miles' Operation)** is the gold standard. It involves the permanent removal of the rectum, anus, and sigmoid colon, resulting in a permanent end-colostomy. This procedure is indicated when a "negative distal margin" (usually 1–2 cm) cannot be achieved without sacrificing the sphincters, or in cases of advanced local invasion where sphincter preservation is oncologically unsafe. **Analysis of Incorrect Options:** * **Anterior Resection (AR):** This is preferred for tumors in the upper and middle thirds of the rectum where the anal sphincter can be preserved. In "advanced" lower rectal cases, AR is often not feasible due to sphincter involvement. * **Proximal Colostomy:** This is a palliative procedure used to relieve intestinal obstruction in inoperable cases. It does not treat the primary malignancy. * **Ileostomy:** Similar to a colostomy, this is a diversionary procedure. While a "defunctioning ileostomy" is often created to protect a low anastomosis after an AR, it is not a definitive treatment for the carcinoma itself. **High-Yield Clinical Pearls for NEET-PG:** * **The 5 cm Rule:** Tumors >5 cm from the anal verge are usually candidates for Sphincter Saving Surgery (SSS/Anterior Resection). * **Total Mesorectal Excision (TME):** This is the standard of care for rectal cancer surgery to reduce local recurrence rates. * **Neoadjuvant Chemoradiotherapy:** Standard for Stage II and III rectal cancers to downstage the tumor before surgery. * **Distance for Margin:** A 2 cm distal margin is traditional, but 1 cm is now considered oncologically acceptable for low rectal cancers.

Question 858: A posteriorly perforating ulcer in the pyloric antrum of the stomach is most likely to produce initial localized peritonitis or abscess formation in which of the following spaces?

A. Omental bursa (lesser sac) (Correct Answer)
B. Greater sac
C. Right subphrenic space
D. Hepato-renal space (pouch of Morison)

Explanation: ### Explanation **1. Why the Correct Answer is Right:** The stomach is an intraperitoneal organ. The **omental bursa (lesser sac)** is the potential space located immediately posterior to the stomach and the lesser omentum. When a peptic ulcer located on the **posterior wall** of the pyloric antrum or body perforates, the gastric contents are initially confined by the boundaries of the lesser sac. This leads to localized peritonitis or the formation of a "lesser sac abscess" before potentially spreading through the foramen of Winslow. **2. Why the Incorrect Options are Wrong:** * **Greater Sac:** This is the main part of the peritoneal cavity. Anterior wall ulcers typically perforate into the greater sac, leading to generalized peritonitis. * **Right Subphrenic Space:** This space is located between the diaphragm and the liver. While fluid can eventually track here, it is not the *initial* site for a posterior antral perforation. * **Hepato-renal space (Pouch of Morison):** This is the deepest part of the intraperitoneal cavity in a supine patient. It is the primary site for fluid collection in **anterior** duodenal perforations or gallbladder ruptures, as fluid tracks along the paracolic gutters. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Most Common Site of Perforation:** The **anterior wall** of the duodenum (D1) is the most common site for peptic ulcer perforation (leads to generalized peritonitis). * **Posterior Duodenal Ulcer:** These typically do not perforate into a space but rather **erode** into the **Gastroduodenal Artery**, causing massive hematemesis. * **Posterior Gastric Ulcer:** These can erode into the **Splenic Artery** or the **Pancreas**, leading to referred back pain. * **Air under Diaphragm:** Seen in 70-80% of cases on an upright X-ray; its absence does not rule out perforation.

Question 859: What is the most common site of an intra-peritoneal abscess?

A. Right superior intra-peritoneal space
B. Left superior intra-peritoneal space
C. Right inferior intra-peritoneal space (Correct Answer)
D. Left inferior intra-peritoneal space

Explanation: **Explanation:** The distribution of intra-peritoneal abscesses is primarily dictated by the **flow of peritoneal fluid** and the anatomical compartments created by the mesentery and the paracolic gutters. The **Right Inferior Intra-peritoneal Space** (specifically the right iliac fossa and the right paracolic gutter) is the most common site for abscess formation. This is due to two main factors: 1. **Source of Infection:** The two most common causes of peritonitis—**acute appendicitis** and **perforated peptic ulcers**—lead to the drainage of infected material into the right paracolic gutter and the right iliac fossa. 2. **Anatomy:** The right paracolic gutter is wider and more continuous than the left, facilitating the downward flow of inflammatory exudate toward the pelvis or its localization in the right lower quadrant. **Analysis of Incorrect Options:** * **Right Superior Space (Subphrenic):** While common, it is less frequent than the inferior space. Fluid usually reaches here from a perforated ulcer or gallbladder disease, but gravity and the phrenicocolic ligament often direct fluid inferiorly. * **Left Superior Space:** This is the least common site because the **phrenicocolic ligament** acts as a physical barrier, preventing the upward flow of infected fluid from the paracolic gutter into the left subphrenic space. * **Left Inferior Space:** This area is less frequently involved because the sigmoid colon and its mesentery tend to localize infections (like diverticulitis) locally, and it does not receive drainage from the common upper GI pathologies. **NEET-PG High-Yield Pearls:** * **Subphrenic Abscess:** The most common site for a subphrenic abscess specifically is the **Right Posterior Superior space** (Morison’s Pouch). * **Pelvic Abscess:** This is the most common site for an abscess to localize following *generalized* peritonitis, as the pelvis is the most dependent part of the peritoneal cavity. * **Clinical Sign:** Persistent fever and "glassy eyes" in a postoperative patient should always raise suspicion of an occult intra-peritoneal abscess.

Question 860: Which of the following is NOT true of cholelithiasis?

A. Biliary fistula is a complication of gallstones.
B. Cholelithiasis is more common in females.
C. Clofibrate therapy is a predisposing factor for cholelithiasis.
D. Ileal resection has no effect on gallstone formation. (Correct Answer)

Explanation: **Explanation:** The correct answer is **D**, as ileal resection is a well-known risk factor for the development of gallstones. **1. Why Option D is the correct choice (The "False" statement):** The terminal ileum is the primary site for the reabsorption of **bile salts** (enterohepatic circulation). When the ileum is resected or diseased (e.g., Crohn’s disease), the bile salt pool is depleted. Since bile salts are essential for keeping cholesterol in a soluble state, their deficiency leads to **supersaturation of bile with cholesterol**, resulting in the formation of cholesterol gallstones. **2. Analysis of other options:** * **Option A:** Biliary fistulas (e.g., cholecystoduodenal fistula) occur when a large stone causes pressure necrosis of the gallbladder wall and an adjacent organ. This can lead to **gallstone ileus**. * **Option B:** Cholelithiasis follows the classic "4 F's" rule: **F**emale, **F**at, **F**ertile, and **F**orty. Estrogen increases cholesterol secretion into bile, making it more lithogenic. * **Option C:** Clofibrate (and other fibrates) inhibits the enzyme *7-alpha-hydroxylase*, reducing bile acid synthesis and increasing biliary cholesterol excretion, thus predisposing to stones. **Clinical Pearls for NEET-PG:** * **Most common type of stone:** Mixed stones (globally), though cholesterol stones are common in the West. * **Black Pigment Stones:** Associated with chronic hemolysis (e.g., Hereditary Spherocytosis, Sickle Cell Anemia) and cirrhosis. * **Brown Pigment Stones:** Associated with biliary stasis and infection (e.g., *E. coli*, *Ascaris lumbricoides*). * **Investigation of Choice:** Ultrasonography (USG) is the gold standard for diagnosis.

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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