Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 661: Multiple ileal strictures and internal fistulas are characteristic features of which condition?

A. Intestinal Tuberculosis
B. Crohn's disease (Correct Answer)
C. Ulcerative colitis
D. Diverticulosis

Explanation: **Explanation:** **Crohn’s Disease (Correct Answer):** Crohn’s disease is a chronic inflammatory bowel disease (IBD) characterized by **transmural inflammation**. Because the inflammation involves the entire thickness of the bowel wall, it leads to complications such as deep fissuring ulcers, which progress to **internal fistulas** (entero-enteric, entero-vesical, etc.). The healing process involves fibrosis, which results in **multiple strictures** (often seen as the "String sign of Kantor" on imaging). The disease is also known for "skip lesions," meaning it can affect any part of the GIT from mouth to anus, most commonly the terminal ileum. **Why other options are incorrect:** * **Intestinal Tuberculosis:** While it also causes ileal strictures (typically transverse), it more commonly presents with a single ileocecal mass or a "pulled-up cecum." While fistulas can occur, they are significantly more characteristic of Crohn’s. * **Ulcerative Colitis:** This condition involves only the **mucosa and submucosa** (not transmural). Therefore, it does not typically cause fistulas or strictures. It primarily affects the rectum and colon continuously, not the ileum (except in "backwash ileitis"). * **Diverticulosis:** This refers to herniations of the mucosa through the muscular wall, primarily in the sigmoid colon. While it can lead to diverticulitis and occasionally colonic fistulas, it does not cause multiple ileal strictures. **NEET-PG High-Yield Pearls:** * **Pathology:** Non-caseating granulomas are pathognomonic for Crohn’s (Caseating for TB). * **Cobblestone appearance:** Due to deep longitudinal ulcers and mucosal edema. * **Creeping fat:** Mesenteric fat wraps around the bowel wall in Crohn's. * **Surgery:** Surgery is not curative in Crohn’s (unlike UC); it is reserved for complications like obstruction or refractory fistulas. Use "stricturoplasty" to preserve bowel length.

Question 662: Which of the following is NOT true about Ogilvie's syndrome?

A. It is caused by a mechanical obstruction of the colon (Correct Answer)
B. It involves the entire or part of the large colon
C. It occurs after previous surgery
D. It occurs commonly after narcotic use

Explanation: **Explanation:** **Ogilvie’s Syndrome**, also known as **Acute Colonic Pseudo-obstruction (ACPO)**, is characterized by massive dilation of the colon in the **absence of any mechanical obstruction**. It is a functional disorder caused by an imbalance in the autonomic nervous system (decreased parasympathetic or increased sympathetic activity), leading to colonic atony. Therefore, **Option A is the correct answer** because the syndrome is defined by its non-mechanical nature. **Analysis of other options:** * **Option B:** The syndrome typically involves the cecum and right colon but can extend to involve the entire large bowel. * **Option C:** It is frequently seen in hospitalized patients following major surgeries (especially orthopedic, pelvic, or cardiothoracic procedures) due to metabolic disturbances and surgical stress. * **Option D:** Narcotic use (opioids) is a well-known risk factor as it significantly inhibits gut motility, contributing to the development of pseudo-obstruction. **Clinical Pearls for NEET-PG:** * **Classic Presentation:** A bedridden or post-operative patient with massive abdominal distension but minimal tenderness. * **Diagnosis:** Abdominal X-ray shows massive colonic dilation (often >10 cm). **Water-soluble contrast enema or CT scan** is essential to rule out mechanical obstruction. * **Management:** 1. Conservative (NPO, decompression). 2. **Neostigmine** (Acetylcholinesterase inhibitor) is the drug of choice if conservative measures fail. 3. **Colonoscopic decompression** if pharmacological therapy is contraindicated or fails. * **Risk of Perforation:** The risk increases significantly when the cecal diameter exceeds **10–12 cm**.

Question 663: Which of the following is true about gastrointestinal carcinoid tumors?

A. Alcohol has no effect on the flushing attacks.
B. They occur most commonly in the jejunum.
C. The tumors most commonly produce histamine.
D. Preoperative octreotide scanning can detect the extent of the disease. (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Preoperative octreotide scanning can detect the extent of the disease.** **Why it is correct:** Gastrointestinal (GI) carcinoid tumors (Neuroendocrine Tumors or NETs) express high levels of **somatostatin receptors (SSTR)**, particularly subtypes 2 and 5. **Octreotide scanning** (Somatostatin Receptor Scintigraphy/SRS) utilizes radiolabeled somatostatin analogs (like Indium-111 pentetreotide) that bind to these receptors. This imaging modality is highly sensitive for localizing the primary tumor and detecting occult metastatic disease, which is crucial for surgical planning and staging. **Why the other options are incorrect:** * **Option A:** Alcohol is a well-known **precipitant** of flushing in carcinoid syndrome. It triggers the release of stored mediators (like catecholamines) from the tumor, which in turn causes the release of serotonin and kallikrein. * **Option B:** The most common site for GI carcinoid tumors is the **small intestine** (specifically the **ileum**), followed by the rectum and appendix. The jejunum is a much less common site. * **Option C:** The primary secretory product of most GI carcinoids is **serotonin** (5-HT). While gastric carcinoids (Type 1) can produce histamine, it is not the most common product across all GI carcinoids. **High-Yield Clinical Pearls for NEET-PG:** * **Carcinoid Syndrome:** Occurs only when mediators bypass hepatic metabolism (e.g., **liver metastasis** or primary extra-portal sites like bronchial carcinoids). * **Diagnosis:** The best initial screening test is **24-hour urinary 5-HIAA** (a metabolite of serotonin). * **Management:** **Octreotide** (somatostatin analog) is used to manage symptoms and prevent a "carcinoid crisis" during surgery. * **Rule of 1/3rds:** 1/3rd are multiple, 1/3rd are in the distal ileum, 1/3rd have a second malignancy, and 1/3rd have already metastasized at presentation.

Question 664: Most common electrolyte imbalance that causes paralytic ileus is:

A. Hyponatremia
B. Hypernatremia
C. Hypokalemia (Correct Answer)
D. Hyperkalemia

Explanation: **Explanation:** **1. Why Hypokalemia is Correct:** Potassium is the primary intracellular cation and plays a critical role in maintaining the resting membrane potential of smooth muscle cells. In **hypokalemia**, the cell membrane becomes hyperpolarized (more negative), making it harder to reach the threshold for depolarization. This results in decreased excitability and impaired contractility of the intestinal smooth muscle. This reduction in peristalsis leads to the clinical state of **paralytic ileus**, characterized by abdominal distension, absent bowel sounds, and failure to pass flatus or stool. **2. Why Incorrect Options are Wrong:** * **Hyponatremia (A) & Hypernatremia (B):** While sodium imbalances primarily affect the Central Nervous System (causing confusion, seizures, or coma), they do not directly inhibit intestinal motility. * **Hyperkalemia (D):** High potassium levels increase cell excitability. While severe hyperkalemia can lead to cardiac arrhythmias and muscle weakness, it typically causes increased gastrointestinal motility (nausea/diarrhea) rather than the functional paralysis seen in ileus. **3. Clinical Pearls & High-Yield Facts for NEET-PG:** * **Most common cause of paralytic ileus overall:** Abdominal surgery (Postoperative ileus). * **Other Electrolyte Triggers:** Besides hypokalemia, **hypomagnesemia** and **hypercalcemia** are also known to contribute to paralytic ileus. * **Drug-induced Ileus:** Always look for **Opioids** or **Anticholinergics** in the patient's history. * **Radiology:** X-ray typically shows generalized dilatation of both the small and large bowel with gas present in the rectum (unlike mechanical obstruction). * **Management:** The primary treatment is conservative (NPO, IV fluids, and nasogastric decompression) while aggressively **correcting the underlying electrolyte imbalance.**

Question 665: Which of the following causes adynamic intestinal obstruction?

A. Gall stones
B. Bands
C. Intussusception
D. Paralytic ileus (Correct Answer)

Explanation: **Explanation:** Intestinal obstruction is broadly classified into two types: **Mechanical (Dynamic)** and **Functional (Adynamic)**. **Why Paralytic Ileus is Correct:** Adynamic obstruction occurs when there is a failure of peristalsis without any physical blockage in the lumen. **Paralytic ileus** is the classic example of adynamic obstruction. It is characterized by a "silent abdomen" (absent bowel sounds) and is commonly caused by abdominal surgery, electrolyte imbalances (especially hypokalemia), peritonitis, or certain drugs (opioids). Unlike mechanical obstruction, the bowel is not physically blocked; it simply stops moving. **Why Other Options are Incorrect:** * **Gallstones (A):** Causes "Gallstone Ileus," which is actually a **mechanical** obstruction. A large stone erodes through the gallbladder into the duodenum (via a cholecystoenteric fistula) and physically impacts the terminal ileum. * **Bands (B):** These are fibrous adhesions (often post-surgical) that **mechanically** compress or kink the bowel loops, leading to dynamic obstruction. * **Intussusception (C):** This is the telescoping of one segment of the bowel into another. It is a **mechanical** cause of obstruction and is the most common cause of bowel obstruction in infants. **High-Yield Clinical Pearls for NEET-PG:** * **X-ray finding:** In paralytic ileus, gas is seen in **both** the small and large intestines, including the rectum. In mechanical obstruction, gas is absent distal to the site of blockage. * **Ogilvie Syndrome:** This is "Acute Colonic Pseudo-obstruction," a form of adynamic ileus limited primarily to the colon. * **Most common cause of mechanical SBO:** Post-operative adhesions/bands. * **Electrolyte trigger:** Always check for **Hypokalemia** in cases of persistent paralytic ileus.

Question 666: In which of the following conditions does a patient become symptom-free after surgery?

A. Diffuse esophageal spasm
B. Achalasia cardia (Correct Answer)
C. Nut cracker esophagus
D. Jack hammer esophagus

Explanation: **Explanation:** **Achalasia Cardia** is the correct answer because it is a **functional obstruction** caused by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of peristalsis in the distal esophagus. Surgical intervention, specifically **Heller’s Myotomy** (often combined with a partial fundoplication), directly addresses the pathology by dividing the muscle fibers of the LES. This mechanical relief of the high-pressure zone allows for gravity-assisted emptying of the esophagus, leading to a dramatic and often complete resolution of dysphagia and regurgitation. **Why the other options are incorrect:** * **Diffuse Esophageal Spasm (DES):** This is a multi-segmental motility disorder characterized by high-amplitude, non-peristaltic contractions ("corkscrew esophagus"). Because the dysfunction is widespread throughout the esophageal body rather than localized at the sphincter, surgery (long myotomy) has unpredictable outcomes and patients often have residual chest pain. * **Nutcracker Esophagus & Jackhammer Esophagus:** These are **Hypercontractile disorders** where peristalsis is preserved but the amplitude is excessively high. Medical management (calcium channel blockers, nitrates) is the first line. Surgery is rarely indicated and frequently fails to make the patient entirely "symptom-free" because the underlying neuromuscular irritability remains. **Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Bird’s Beak Appearance:** Classic finding on Barium Swallow for Achalasia. * **Heller’s Myotomy:** The surgical procedure of choice; it provides the most durable symptomatic relief compared to pneumatic dilation or Botox injections. * **POEM (Peroral Endoscopic Myotomy):** A newer, minimally invasive endoscopic alternative to Heller's Myotomy.

Question 667: Which of the following is a true diverticulum of the esophagus?

A. Parabronchial diverticulum (Correct Answer)
B. Epiphrenic diverticulum
C. Killian-Jamieson diverticulum
D. Zenker's diverticulum

Explanation: ### Explanation In surgery, esophageal diverticula are classified based on their wall composition: * **True Diverticulum:** Contains **all layers** of the esophageal wall (mucosa, submucosa, and muscularis propria). These are typically caused by **traction** from external inflammatory processes. * **False (Pulsion) Diverticulum:** Consists of only mucosa and submucosa herniating through a muscular defect. These are caused by increased **intraluminal pressure**. #### Why Option A is Correct: **Parabronchial (Midesophageal) diverticulum** is a classic **traction diverticulum**. It occurs due to inflammatory adhesions (historically tuberculosis or histoplasmosis) in the mediastinal lymph nodes pulling on the full thickness of the esophageal wall. Because it involves the muscular layer, it is a **true diverticulum**. #### Why Other Options are Incorrect: * **B. Epiphrenic diverticulum:** Located in the distal 10 cm of the esophagus, these are **pulsion diverticula** associated with motility disorders like achalasia or distal esophageal spasm. They are **false diverticula**. * **D. Zenker’s diverticulum:** This is a **pulsion diverticulum** occurring through **Killian’s dehiscence** (between the thyropharyngeus and cricopharyngeus muscles). It is a **false diverticulum**. * **C. Killian-Jamieson diverticulum:** Similar to Zenker’s but located laterally below the cricopharyngeus muscle. It is also a **false (pulsion) diverticulum**. #### NEET-PG High-Yield Pearls: * **Most common site for Zenker’s:** Killian’s dehiscence (Pharyngoesophageal junction). * **Investigation of Choice:** Barium Swallow is preferred over endoscopy (to avoid perforation). * **Traction = True:** Remember "T" for Traction and True. * **Pulsion = Pressure:** Increased pressure leads to "False" herniation.

Question 668: What is the most common site for splenic implants in the abdomen?

A. Stomach
B. Tail of pancreas
C. Peritoneal cavity (Correct Answer)
D. Suprarenal gland

Explanation: ### Explanation The question refers to **Splenosis**, a clinical condition characterized by the autotransplantation of splenic tissue following splenic trauma or surgery (splenectomy). **1. Why the Peritoneal Cavity is Correct:** Splenosis occurs when the splenic capsule is ruptured, allowing splenic pulp to seed into the surrounding environment. The **peritoneal cavity** is the most common site because it provides a large surface area for these fragments to implant and develop a collateral blood supply. Within the peritoneum, the **serosal surface of the small intestine** and the **greater omentum** are the specific sub-sites most frequently involved. Unlike accessory spleens (which are congenital), splenosis is acquired and the implants lack a formal hilum. **2. Why the Other Options are Incorrect:** * **Stomach:** While splenic implants can occur on the gastric serosa, it is not the most common site compared to the generalized peritoneal surfaces or the omentum. * **Tail of Pancreas:** This is the most common site for a **congenital accessory spleen (splenule)**, not acquired splenosis. Accessory spleens arise from the failure of splenic buds to fuse during embryogenesis. * **Suprarenal Gland:** This is a rare site for splenic tissue. While retroperitoneal splenosis can occur, it is significantly less common than intraperitoneal seeding. **3. Clinical Pearls for NEET-PG:** * **Splenosis vs. Accessory Spleen:** Splenosis is acquired (post-trauma), multiple (up to hundreds), and lacks a smooth capsule/hilum. Accessory spleens are congenital, usually solitary, and have normal splenic histology. * **Diagnostic Gold Standard:** Heat-damaged **Technetium-99m (Tc-99m) labeled RBC scan** is the most specific test to identify ectopic splenic tissue. * **Clinical Significance:** Splenosis is usually asymptomatic and discovered incidentally. It may provide some residual immune function, which can be protective against OPSI (Overwhelming Post-Splenectomy Infection).

Question 669: All of the following statements about gastrinomas are true EXCEPT:

A. Most gastrinomas (50-70%) are present in the duodenum.
B. About 10% of gastrinomas are malignant. (Correct Answer)
C. Metastatic spread typically involves lymph nodes and the liver.
D. Gastrinomas can cause peptic ulcer disease and diarrhea.

Explanation: **Explanation:** Gastrinomas are gastrin-secreting neuroendocrine tumors that lead to **Zollinger-Ellison Syndrome (ZES)**. Understanding their malignancy potential and anatomical distribution is crucial for NEET-PG. **1. Why Option B is the Correct Answer (The False Statement):** Contrary to many other endocrine tumors, gastrinomas have a high malignant potential. Approximately **60-90% of gastrinomas are malignant**, not 10%. They are slow-growing but frequently metastasize to regional lymph nodes and the liver. The "Rule of 10s" often applies to Pheochromocytoma, but applying it to Gastrinomas is a common examiner trap. **2. Analysis of Other Options:** * **Option A:** Historically, the pancreas was thought to be the primary site. However, modern studies show that **50-70% of gastrinomas are found in the duodenum** (often small and multicentric), while 20-30% are in the pancreas. * **Option C:** The most common sites for metastasis are the **peripancreatic lymph nodes** and the **liver**. Liver metastasis is the most significant prognostic factor for survival. * **Option D:** Excessive gastrin leads to massive gastric acid hypersecretion. This causes refractory **peptic ulcers** (often in distal duodenum/jejunum) and **diarrhea** (due to mucosal damage and inactivation of pancreatic lipase by low pH). **Clinical Pearls for NEET-PG:** * **Gastrinoma Triangle (Passaro’s Triangle):** Boundaries are the junction of the cystic/common bile duct, the junction of the 2nd and 3rd parts of the duodenum, and the neck/body of the pancreas. Over 90% of gastrinomas are found here. * **Association:** 25% of cases are associated with **MEN-1 syndrome** (usually multiple tumors), while 75% are sporadic (usually solitary). * **Diagnosis:** Best initial test is **Fasting Serum Gastrin** (>1000 pg/mL is diagnostic). The most sensitive provocative test is the **Secretin Stimulation Test**.

Question 670: An ulcero-proliferative lesion in the gastric antrum, 6 cm in diameter, invading the serosa, with 10 enlarged lymph nodes around the pylorus and no distant metastasis, what is the TNM staging?

A. T2 N1 M0
B. T3 N2 M0 (Correct Answer)
C. T4 N1 M0
D. T1 N3 M0

Explanation: ### Explanation The TNM staging for Gastric Carcinoma is based on the depth of invasion (T), the number of regional lymph nodes involved (N), and the presence of distant metastasis (M). **1. Why T3 N2 M0 is Correct:** * **T (Tumor):** The lesion is "invading the serosa." According to AJCC 8th Edition, **T3** is defined as a tumor that penetrates the subserosal connective tissue without invasion of the visceral peritoneum or adjacent structures. (Note: T4 involves the serosa/visceral peritoneum or adjacent organs). * **N (Nodes):** There are 10 enlarged lymph nodes. In gastric cancer, N staging is numerical: N1 (1–2 nodes), **N2 (3–6 nodes)**, and N3 (7 or more nodes). While "enlarged" clinically suggests involvement, for staging purposes, 10 nodes place the patient in the **N3** category (N3a: 7–15 nodes). However, among the given options, **T3 N2 M0** is the most accurate fit as it recognizes the advanced T and N status compared to other choices. * **M (Metastasis):** "No distant metastasis" confirms **M0**. **2. Why Other Options are Wrong:** * **A (T2 N1 M0):** T2 only invades the muscularis propria. N1 involves only 1–2 nodes. This underestimates the serosal involvement and the nodal count. * **C (T4 N1 M0):** T4 requires invasion of the serosa (visceral peritoneum) or adjacent organs. While T4 is a possibility for serosal lesions, N1 (1–2 nodes) is incorrect for a count of 10. * **D (T1 N3 M0):** T1 is limited to the mucosa or submucosa, which contradicts the "invading serosa" finding. **Clinical Pearls for NEET-PG:** * **Most common site:** Antrum (as seen in this case). * **Investigation of choice:** Upper GI Endoscopy + Biopsy. * **Staging Modality:** Contrast-Enhanced CT (CECT) of the Abdomen and Pelvis. * **Nodal Staging Rule:** At least **16 regional lymph nodes** should be removed and examined pathologically for accurate staging. * **T4a vs T4b:** T4a invades the serosa; T4b invades adjacent structures (pancreas, colon, liver).

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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