Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 141: What is the most common cause of bowel obstruction?

A. Malignancy
B. Volvulus
C. Peritoneal adhesions (Correct Answer)
D. External hernia

Explanation: **Explanation:** Intestinal obstruction is a common surgical emergency, and understanding its etiology is crucial for NEET-PG. **1. Why Peritoneal Adhesions are Correct:** Peritoneal adhesions are the **most common cause of small bowel obstruction (SBO)** and overall bowel obstruction in developed and developing countries alike. They typically occur following prior abdominal or pelvic surgery (found in up to 90% of patients undergoing laparotomy). Adhesions create fibrous bands that can kink, compress, or entrap loops of the bowel, leading to mechanical interference. **2. Analysis of Incorrect Options:** * **Malignancy:** While a leading cause of **large bowel obstruction (LBO)**, it is less common than adhesions when considering the entire intestinal tract. * **Volvulus:** This refers to the twisting of a loop of intestine around its mesenteric axis. While common in specific regions (e.g., the "sigmoid belt"), it is not the leading cause globally. * **External Hernia:** Historically, incarcerated hernias were the leading cause of obstruction. However, with the rise in elective surgical procedures and better hernia management, they have been surpassed by post-operative adhesions. It remains the most common cause in patients with a **virgin abdomen** (no prior surgery). **3. NEET-PG High-Yield Pearls:** * **Most common cause of SBO:** Adhesions. * **Most common cause of LBO:** Colorectal Malignancy. * **Most common cause of SBO in a "virgin abdomen":** Incarcerated Hernia. * **Most common cause of Intussusception (Adults):** Tumor (Lead point); in **Children**, it is Idiopathic. * **Classic X-ray finding:** "Step-ladder pattern" of dilated small bowel loops with multiple air-fluid levels.

Question 142: Which of the following is NOT a cause of stress-related mucosal injury?

A. Head injury
B. Helicobacter pylori (Correct Answer)
C. Severe burns
D. Sepsis

Explanation: **Explanation:** Stress-related mucosal injury (SRMI) refers to acute gastric mucosal lesions that develop in patients under severe physiological stress. The underlying pathophysiology involves **splanchnic hypoperfusion**, which leads to mucosal ischemia, reduced bicarbonate production, and a breakdown of the protective mucosal barrier. **Why B is the correct answer:** * **Helicobacter pylori:** This is a chronic colonizer of the gastric antrum. While it is the primary cause of **chronic antral gastritis** and **peptic ulcer disease (PUD)**, it is not a cause of acute stress-related injury. SRMI is triggered by systemic physiological collapse, whereas *H. pylori* damage is mediated by chronic inflammation and urease production. **Why the other options are incorrect:** * **A. Head Injury:** Specifically associated with **Cushing’s Ulcers**. Increased intracranial pressure stimulates the vagus nerve, leading to gastric acid hypersecretion. * **C. Severe Burns:** Associated with **Curling’s Ulcers**. Significant fluid loss leads to reduced plasma volume and gastric mucosal ischemia. * **D. Sepsis:** A classic cause of SRMI due to the release of inflammatory mediators and systemic hypotension, which compromises the gastric microcirculation. **High-Yield Clinical Pearls for NEET-PG:** * **Curling’s Ulcer:** Seen in **Burns** (Think: Curling iron causes burns). * **Cushing’s Ulcer:** Seen in **CNS** injury/Head trauma (Think: Cushing = CNS). * **Location:** Stress ulcers are typically multiple, shallow, and found in the **acid-secreting portions (fundus and body)** of the stomach, unlike chronic PUD which is often solitary and found in the antrum or duodenum. * **Prophylaxis:** Indicated for high-risk patients (e.g., mechanical ventilation >48 hours, coagulopathy).

Question 143: In case of appendicitis, if the pain is exacerbated on medial rotation of the thigh, what is the likely position of the appendix?

A. Pelvic (Correct Answer)
B. Preileal
C. Paracaecal
D. Mid-inguinal

Explanation: ### Explanation The correct answer is **A. Pelvic**. This clinical finding describes the **Obturator Sign**. When the appendix is in the **pelvic position**, it lies in close proximity to the **obturator internus muscle**. If the appendix is inflamed, any movement that stretches this muscle—specifically **passive internal (medial) rotation of the flexed right thigh**—causes irritation of the overlying parietal peritoneum, resulting in hypogastric pain. #### Analysis of Options: * **Pelvic (Correct):** This is the second most common position (approx. 30%). It is associated with the Obturator Sign and may also present with urinary frequency or rectal tenesmus due to irritation of the bladder or rectum. * **Preileal:** In this position, the appendix lies anterior to the terminal ileum. It often presents with "silent" appendicitis because it does not irritate the parietal peritoneum early on, and it lacks specific muscle-stretch signs. * **Paracaecal:** Here, the appendix lies lateral to the caecum. While it causes localized tenderness in the right iliac fossa, it does not typically involve the obturator or psoas muscles. * **Mid-inguinal:** This is not a standard anatomical term for appendiceal positions. The most common position is **Retrocaecal** (approx. 65%), which is associated with the **Psoas Sign** (pain on hip extension). #### High-Yield Clinical Pearls for NEET-PG: * **Psoas Sign:** Pain on passive extension of the right hip; indicates a **Retrocaecal** appendix. * **Rovsing’s Sign:** Pain in the RIF when the LIF is palpated; indicates general peritoneal irritation. * **Baldwing’s Sign:** Pain in the loin when the right leg is lifted with the knee kept straight; also suggests a **Retrocaecal** position. * **McBurney’s Point:** Located at the junction of the lateral 1/3rd and medial 2/3rds of the line joining the ASIS to the umbilicus; the site of maximum tenderness.

Question 144: Which of the following is true about acute dilatation of the stomach?

A. Dilatation of stomach seen on X-ray (Correct Answer)
B. Presents with vomiting
C. Aspiration
D. Atony of the stomach

Explanation: **Explanation:** **Acute Dilatation of the Stomach (ADS)** is a rare but life-threatening condition characterized by rapid, massive distension of the stomach. It is often associated with postoperative states (especially after abdominal or orthopedic surgery), binge eating (polyphagia), or superior mesenteric artery (SMA) syndrome. **1. Why Option A is Correct:** The hallmark of diagnosis is a **plain abdominal X-ray**, which reveals a massive, gas-filled stomach shadow occupying the majority of the abdominal cavity, often extending down to the pelvis. This "gastric bubble" is the most definitive radiological sign of the condition. **2. Analysis of Incorrect Options:** * **Option B (Vomiting):** Paradoxically, patients with ADS often **cannot vomit** effectively despite intense nausea. This is due to the extreme distension causing an angulation of the gastroesophageal junction, which acts as a one-way valve. If vomiting does occur, it is usually small-volume "overflow" vomiting. * **Option C (Aspiration):** While aspiration is a potential complication of many GI issues, it is not a defining feature or a "true" statement regarding the primary pathology of ADS compared to the diagnostic certainty of an X-ray. * **Option D (Atony of the stomach):** While the stomach becomes atonic *eventually* due to overstretching, the primary mechanism is often mechanical or obstructive (like SMA syndrome) or related to aerophagia. "Atony" is a consequence rather than the defining characteristic. **High-Yield Clinical Pearls for NEET-PG:** * **Management:** The immediate treatment is **Nasogastric (NG) tube decompression**. If the stomach is too distended, the NG tube may fail, requiring emergency gastrostomy. * **Complication:** The most dreaded complication is **gastric necrosis and perforation** (usually along the greater curvature) due to intramural vessel compression. * **SMA Syndrome (Wilkie’s Syndrome):** A common cause where the 3rd part of the duodenum is compressed between the SMA and the Aorta.

Question 145: A patient presents with hematemesis and melena. An initial upper GI endoscopy reveals no significant findings. Two days later, the patient rebleeds. What is the next appropriate investigation?

A. Emergency angiography
B. Repeat upper GI endoscopy
C. Enteroscopy
D. Exploratory laparotomy (Correct Answer)

Explanation: **Explanation:** The management of obscure gastrointestinal bleeding (OGIB) follows a specific diagnostic algorithm. When a patient presents with significant rebleeding (hematemesis/melena) after an initial negative upper GI endoscopy (UGIE), the priority is to identify the source while managing hemodynamic stability. **Why Exploratory Laparotomy is correct:** In the context of acute, life-threatening rebleeding where initial endoscopic measures have failed to identify a source, **Exploratory Laparotomy with On-table Enteroscopy** is considered the "gold standard" and the definitive next step. It allows for direct visualization and palpation of the entire bowel, especially the small intestine, which is the most common site for obscure bleeding (e.g., Meckel’s diverticulum, GIST, or Dieulafoy’s lesion). **Analysis of Incorrect Options:** * **Repeat Upper GI Endoscopy:** While often done in clinical practice for "missed" lesions (like a Dieulafoy’s lesion), it is unlikely to yield new results if the first was thorough and the patient is now actively rebleeding. * **Emergency Angiography:** This is useful only if the bleeding rate is >0.5 ml/min. While it can be diagnostic and therapeutic, it is often bypassed for surgery in unstable patients or when surgical intervention is deemed more definitive. * **Enteroscopy:** Push or double-balloon enteroscopy is time-consuming and technically demanding. It is preferred for hemodynamically stable patients with chronic occult bleeding, not for acute, massive rebleeding. **Clinical Pearls for NEET-PG:** * **Obscure GI Bleed:** Defined as bleeding from a source not identified by routine UGIE and colonoscopy. * **Most common cause of obscure GI bleed in patients <40 years:** Meckel’s Diverticulum. * **Most common cause in patients >60 years:** Angiodysplasia. * **Investigation of choice for stable obscure bleed:** Capsule Endoscopy. * **Investigation of choice for unstable/massive obscure bleed:** Exploratory Laparotomy.

Question 146: Pulled up caecum is a feature of?

A. Malignancy
B. Intussusception
C. Necrotising enterocolitis
D. TB (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. TB (Tuberculosis)**. **Why TB is the correct answer:** Abdominal tuberculosis, specifically the **hyperplastic variety** involving the ileocaecal region, is characterized by significant transmural inflammation and subsequent fibrosis. As the disease progresses, the healing process leads to the contraction and shortening of the mesentery and the longitudinal muscle fibers of the ascending colon. This fibrotic scarring "pulls" the caecum upward from the right iliac fossa into a subhepatic position. This radiological and clinical finding is classically known as a **"Pulled-up Caecum."** On a barium meal follow-through, this often results in the loss of the normal ileocaecal angle (Stierlin’s sign). **Why other options are incorrect:** * **Malignancy:** While caecal carcinoma can cause a fixed mass or filling defects, it typically does not cause the symmetrical fibrotic contraction required to "pull" the caecum superiorly. * **Intussusception:** This involves the telescoping of one segment of the bowel into another. While the caecum may be displaced or "absent" from the iliac fossa (Dance’s sign), it is due to invagination, not chronic fibrotic pulling. * **Necrotising Enterocolitis (NEC):** This is an acute inflammatory condition primarily in neonates characterized by pneumatosis intestinalis and bowel necrosis, not chronic cicatrization. **High-Yield Clinical Pearls for NEET-PG:** * **Stierlin’s Sign:** Rapid emptying of the inflamed terminal ileum into the caecum (seen in ileocaecal TB). * **Goose-neck deformity:** Seen in the terminal ileum due to narrowing and loss of mucosal patterns. * **Fleischner Sign:** An inverted umbrella appearance of the ileocaecal valve due to thickening. * **Most common site of GI TB:** Ileocaecal region (due to increased lymphoid tissue/Peyer's patches and physiological stasis).

Question 147: Diverticular disease is not common in which part of the gastrointestinal tract?

A. Colon
B. Jejunum
C. Duodenum
D. Stomach (Correct Answer)

Explanation: **Explanation:** The correct answer is **Stomach**. Diverticular disease occurs when the mucosa and submucosa herniate through the muscular layers of the gastrointestinal wall. The stomach is the **least common** site for diverticula in the entire GI tract because it possesses a thick, three-layered muscularis externa (longitudinal, circular, and oblique layers) that provides significant structural integrity against herniation. **Analysis of Options:** * **A. Colon:** This is the **most common** site for diverticula, specifically the sigmoid colon. The presence of *taeniae coli* creates areas of relative weakness where nutrient arteries (vasa recta) penetrate the muscle wall, facilitating herniation. * **B. Jejunum:** Small bowel diverticula are most common in the duodenum, followed by the jejunum. These are typically "false" diverticula (pulsion type) occurring at the mesenteric border where vessels enter. * **C. Duodenum:** This is the second most common site for diverticula after the colon. They are usually found in the second part of the duodenum near the Ampulla of Vater (periampullary diverticula). **Clinical Pearls for NEET-PG:** * **Most common site overall:** Sigmoid Colon (due to high intraluminal pressure). * **Meckel’s Diverticulum:** The most common **true** diverticulum (contains all layers of the bowel wall) and the most common congenital anomaly of the GI tract. * **Zenker’s Diverticulum:** A pulsion diverticulum occurring at the Killian’s dehiscence (pharynx). * **Gastric Diverticula:** Rare; when they occur, they are usually located on the posterior wall of the fundus.

Question 148: Dumping syndrome is associated with which of the following?

A. Reduction of part of the stomach (Correct Answer)
B. Decreased gastric secretion
C. Hyperglycemia
D. Decreased absorption

Explanation: **Explanation:** **Dumping Syndrome** is a common complication following gastric surgeries that bypass or remove the pylorus, such as **Billroth I & II reconstructions, total gastrectomy, or sleeve gastrectomy**. **1. Why Option A is Correct:** The underlying pathophysiology involves the **loss of the stomach's reservoir function** and the absence of the pyloric sphincter. When a "reduction of part of the stomach" occurs, hypertonic chyme is rapidly "dumped" into the small intestine. This leads to a massive osmotic shift of fluid from the intravascular space into the intestinal lumen, causing bowel distension and vasomotor symptoms (Early Dumping). **2. Why the Other Options are Incorrect:** * **B. Decreased gastric secretion:** While surgeries like vagotomy reduce acid, dumping is primarily a **motility and osmotic issue**, not a secretory deficiency. * **C. Hyperglycemia:** While "Late Dumping" involves rapid glucose absorption, it results in **reactive hypoglycemia** due to an exaggerated insulin surge (incretin effect), not sustained hyperglycemia. * **D. Decreased absorption:** While malabsorption can occur post-gastrectomy, dumping syndrome itself is defined by the **rapid transit and osmotic effects**, not primarily by a failure to absorb nutrients. **NEET-PG High-Yield Pearls:** * **Early Dumping (75%):** Occurs 15–30 minutes post-meals. Symptoms: Palpitations, diaphoresis, and abdominal colic. * **Late Dumping (25%):** Occurs 1–3 hours post-meals. Mechanism: Hyperinsulinemic hypoglycemia. * **Management:** Initial treatment is **dietary modification** (small, frequent, dry meals; high protein/low carb; avoiding liquids during meals). * **Medical/Surgical Rx:** **Octreotide** (somatostatin analogue) is the drug of choice for refractory cases. If surgery is needed, **Roux-en-Y reconstruction** is preferred.

Question 149: Which of the following is NOT true about Pseudomyxoma peritonei?

A. It is common in males. (Correct Answer)
B. It is associated with ovarian tumors.
C. It involves the collection of yellow, jelly-like fluid.
D. It is associated with appendiceal adenocarcinoma.

Explanation: **Pseudomyxoma Peritonei (PMP)** is a rare clinical condition characterized by the progressive accumulation of mucinous (jelly-like) ascites within the peritoneal cavity, leading to the "jelly belly" appearance. ### **Explanation of Options:** * **Option A (Correct Answer):** This statement is **false**. Pseudomyxoma peritonei is significantly **more common in females** than in males. In women, it often presents as an ovarian mass, which historically led to confusion regarding the primary site of origin. * **Option B:** This is **true**. PMP is frequently associated with ovarian tumors (often mucinous cystadenocarcinomas). However, modern immunohistochemistry suggests that most of these ovarian involvements are actually metastases from an appendiceal primary. * **Option C:** This is **true**. The hallmark of PMP is the accumulation of **yellow, gelatinous, or jelly-like fluid** (mucin) produced by neoplastic goblet cells. * **Option D:** This is **true**. The most common primary site for PMP is the **appendix** (specifically low-grade mucinous neoplasms or appendiceal adenocarcinomas). ### **Clinical Pearls for NEET-PG:** * **Primary Site:** The **Appendix** is the most common primary site of origin (not the ovary). * **Redistribution Phenomenon:** This is a characteristic feature where tumor cells follow the natural flow of peritoneal fluid and settle in "static" areas like the greater omentum and retrohepatic space, while sparing the mobile small bowel. * **Treatment of Choice:** The current gold standard is **Cytoreductive Surgery (CRS)** combined with **Hyperthermic Intraperitoneal Chemotherapy (HIPEC)**, often referred to as the **Sugarbaker Procedure**. * **Diagnosis:** Often an incidental finding during laparotomy or suggested by "scalloping" of the liver and spleen on CT scans.

Question 150: What are the predisposing factors for esophageal cancer?

A. Tylosis
B. Smoking
C. Lye stricture
D. All of the above (Correct Answer)

Explanation: Esophageal cancer is primarily classified into two histological types: **Squamous Cell Carcinoma (SCC)** and **Adenocarcinoma**. The predisposing factors listed in the options are classic triggers for chronic mucosal irritation and genetic predisposition, leading predominantly to SCC. **Explanation of Options:** * **Tylosis (Howel-Evans Syndrome):** This is an autosomal dominant condition characterized by hyperkeratosis of the palms and soles. It is associated with a near **100% lifetime risk** of developing esophageal SCC due to a mutation in the RHBDF2 gene. * **Smoking:** Tobacco use is a potent carcinogen for the entire upper aerodigestive tract. It acts synergistically with alcohol to significantly increase the risk of SCC. * **Lye (Caustic) Stricture:** Ingestion of corrosive agents causes severe mucosal injury and chronic inflammation. The risk of SCC increases significantly (about 1000-fold) approximately 20–40 years after the initial injury. **Why "All of the Above" is Correct:** Each of these factors contributes to the multi-step process of carcinogenesis—either through direct DNA damage (smoking), chronic regenerative hyperplasia (lye strictures), or inherited genetic susceptibility (tylosis). **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** SCC is most common in the **middle third** of the esophagus; Adenocarcinoma is most common in the **lower third** (associated with GERD and Barrett’s Esophagus). * **Plummer-Vinson Syndrome:** Characterized by the triad of iron deficiency anemia, glossitis, and esophageal webs; it is a high-yield risk factor for SCC in the post-cricoid region. * **Achalasia Cardia:** Long-standing stasis of food leads to chronic esophagitis, increasing the risk of SCC. * **Dietary factors:** Deficiencies in Vitamin A, C, and Zinc, as well as the consumption of nitrosamines and very hot beverages, are linked to SCC.

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

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