Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 131: What is the investigation of choice to determine the depth of cancer invasion?

A. CECT (Contrast-Enhanced Computed Tomography)
B. MRI (Magnetic Resonance Imaging)
C. Barium studies
D. EUS (Endoscopic Ultrasound) (Correct Answer)

Explanation: **Explanation:** The determination of the depth of tumor invasion (T-staging) is critical for deciding between endoscopic resection, neoadjuvant therapy, or radical surgery. **Why EUS is the Correct Answer:** Endoscopic Ultrasound (EUS) is the investigation of choice for assessing the **depth of wall invasion (T-stage)** in gastrointestinal cancers (especially esophageal, gastric, and rectal cancers). Its superiority lies in its high-frequency transducers, which allow for the visualization of the distinct histological layers of the GI wall (mucosa, submucosa, muscularis propria, and adventitia/serosa). It is also highly accurate for identifying regional lymphadenopathy (N-stage). **Analysis of Incorrect Options:** * **CECT (Option A):** While CECT is the "gold standard" for **distant metastasis (M-staging)** and assessing overall resectability, it lacks the spatial resolution to distinguish between the fine layers of the GI wall. * **MRI (Option B):** MRI is excellent for local staging of **rectal cancer** (specifically the mesorectal fascia), but for general GI luminal cancers, EUS remains more accurate for early T-stage depth. * **Barium Studies (Option C):** These are functional and morphological studies used to identify strictures, ulcers, or "apple-core" lesions, but they cannot visualize the depth of invasion beyond the mucosal surface. **High-Yield Clinical Pearls for NEET-PG:** * **T-Staging:** EUS is the most accurate. * **N-Staging:** EUS-FNA (Fine Needle Aspiration) is the most accurate for regional nodes. * **M-Staging:** CECT (Chest/Abdomen/Pelvis) or PET-CT is the investigation of choice. * **Rectal Cancer Exception:** Pelvic MRI is the preferred modality for assessing the circumferential resection margin (CRM).

Question 132: Which of the following can be used in the management of acute pancreatitis?

A. Octreotide
B. Aprotinin
C. Glucagon
D. All the above (Correct Answer)

Explanation: The management of acute pancreatitis focuses on "resting" the pancreas and inhibiting the premature activation of proteolytic enzymes that lead to autodigestion. **Explanation of the Correct Answer:** While the mainstay of treatment is aggressive fluid resuscitation and analgesia, several pharmacological agents have been historically and clinically utilized to reduce pancreatic secretions or neutralize enzymes: * **Octreotide (Option A):** A long-acting somatostatin analogue. It potentally inhibits the exocrine secretion of the pancreas (enzymes and bicarbonate) and reduces splanchnic blood flow. While its routine use in mild cases is debated, it is used to prevent complications like pseudocysts or fistulas. * **Aprotinin (Option B):** A polypeptide that acts as a broad-spectrum protease inhibitor. It was traditionally used to neutralize trypsin and other enzymes already released into the systemic circulation to prevent the systemic inflammatory response syndrome (SIRS). * **Glucagon (Option C):** Glucagon is known to inhibit pancreatic exocrine secretion. In the past, it was used in acute management to "put the pancreas to sleep" by decreasing the volume and enzyme content of pancreatic juice. **Clinical Pearls for NEET-PG:** 1. **Most Common Cause:** Gallstones (worldwide) and Alcohol (second most common). 2. **Early Management:** The most critical step is **aggressive fluid resuscitation** (Isotonic crystalloids like Ringer’s Lactate are preferred). 3. **Antibiotics:** Prophylactic antibiotics are **not** recommended for all cases; they are reserved for infected pancreatic necrosis (documented by CT-guided FNA or gas on CT). 4. **Nutrition:** Early enteral nutrition (via nasojejunal tube) is now preferred over Total Parenteral Nutrition (TPN) as it maintains the gut barrier and reduces bacterial translocation. 5. **Scoring Systems:** Ranson’s criteria, APACHE II, and BISAP are high-yield for predicting severity.

Question 133: A 21-year-old patient attended a party the previous night and presents with the following symptoms: pain in the abdomen radiating to the back, pulse of 100/min, BP of 100/76 mmHg, temperature of 39°C, and vomiting. What is the most probable diagnosis?

A. Acute appendicitis
B. Acute cholecystitis
C. Acute diverticulitis
D. Acute pancreatitis (Correct Answer)

Explanation: **Explanation:** The clinical presentation of epigastric pain radiating to the back, associated with vomiting and a history of recent heavy alcohol consumption (implied by "attending a party"), is a classic hallmark of **Acute Pancreatitis**. **Why Acute Pancreatitis is correct:** * **Pain Pattern:** The hallmark is severe, constant epigastric pain that characteristically radiates to the back (due to the retroperitoneal location of the pancreas). * **Systemic Response:** The patient exhibits signs of Systemic Inflammatory Response Syndrome (SIRS)—tachycardia (100/min) and fever (39°C)—which are common in acute pancreatitis. * **Trigger:** In young adults, binge drinking ("party") is a frequent precipitant of acute attacks. **Why other options are incorrect:** * **Acute Appendicitis:** Typically presents with periumbilical pain migrating to the Right Iliac Fossa (RIF). It does not radiate to the back. * **Acute Cholecystitis:** Pain is usually in the Right Upper Quadrant (RUQ) and radiates to the right scapula or shoulder (Boas' sign), not the mid-back. * **Acute Diverticulitis:** Often referred to as "Left-sided appendicitis," it presents with pain in the Left Lower Quadrant (LLQ) and changes in bowel habits. **NEET-PG High-Yield Pearls:** * **Most common cause:** Gallstones (overall), Alcohol (2nd most common; common in young males). * **Investigation of choice:** Contrast-Enhanced CT (CECT) is the gold standard for diagnosis and assessing severity (ideally done after 72 hours). * **Most sensitive/specific enzyme:** Serum Lipase is more specific and remains elevated longer than Amylase. * **Scoring Systems:** Ranson’s criteria, APACHE II, and BISAP are used to predict prognosis.

Question 134: What is a trichobezoar?

A. A hairball in the stomach, often seen in psychiatric patients. (Correct Answer)
B. A tumor of the stomach.
C. Tuberculosis of the bowel.
D. A collection of worms in the stomach.

Explanation: **Explanation:** A **trichobezoar** is a mass of undigested hair trapped in the gastrointestinal tract, most commonly the stomach. This condition is strongly associated with psychiatric disorders: **trichotillomania** (compulsive hair pulling) and **trichophagia** (compulsive hair eating). Because human hair is resistant to digestive enzymes and peristalsis, it accumulates, becomes matted with food particles, and takes the shape of the gastric cavity. **Analysis of Options:** * **Option A (Correct):** Accurately describes the composition (hair) and the typical patient demographic (psychiatric patients, often adolescent females). * **Option B (Incorrect):** While it may present as a palpable epigastric mass mimicking a tumor, a bezoar is a collection of foreign material, not a neoplastic growth of gastric tissue. * **Option C (Incorrect):** Tuberculosis of the bowel is an infectious process caused by *Mycobacterium tuberculosis*, typically presenting with strictures or ileocecal masses. * **Option D (Incorrect):** A collection of worms (e.g., *Ascaris lumbricoides*) is an intestinal parasitic infestation, not a bezoar. **High-Yield Clinical Pearls for NEET-PG:** * **Rapunzel Syndrome:** An extension of the trichobezoar from the stomach into the small intestine (duodenum/jejunum), which can cause intestinal obstruction. * **Clinical Presentation:** Epigastric mass, abdominal pain, nausea, and halitosis (due to decaying food trapped in the hair). * **Diagnosis:** Upper GI endoscopy is the gold standard for diagnosis. CT scans show a characteristic mottled gas pattern within a well-defined mass. * **Management:** Large trichobezoars usually require **gastrotomy** (surgical removal) as they are too large for endoscopic retrieval. Psychiatric consultation is mandatory to prevent recurrence.

Question 135: All of the following statements about Zenker's diverticulum are true, except?

A. Acquired diverticulum
B. False diverticulum
C. Lateral X-rays on barium swallow are often diagnostic
D. Outpouching of the anterior pharyngeal wall, occurring just above the cricopharyngeus muscle (Correct Answer)

Explanation: **Explanation:** Zenker’s diverticulum is a classic high-yield topic in NEET-PG surgery. The correct answer is **D** because it contains a factual error regarding the anatomical location: Zenker’s diverticulum is an outpouching of the **posterior** pharyngeal wall, not the anterior wall. It occurs through **Killian’s dehiscence**, a triangular area of weakness between the thyropharyngeus and cricopharyngeus muscles (the two components of the inferior constrictor). **Analysis of Options:** * **Option A (True):** It is an **acquired** condition caused by motor dysfunction (incoordination) of the upper esophageal sphincter, leading to increased intraluminal pressure. * **Option B (True):** It is a **false diverticulum** (pulsion type) because the protrusion consists only of mucosa and submucosa, lacking the muscularis layer. * **Option C (True):** **Barium swallow** is the gold standard investigation. Lateral views are diagnostic as they clearly demonstrate the posterior protrusion at the level of the C5-C6 vertebrae. **Clinical Pearls for NEET-PG:** * **Symptoms:** Characterized by "Halitosis" (foul breath due to undigested food), dysphagia, regurgitation, and a "gurgling" sound in the neck (Boyce’s sign). * **Complication:** Recurrent aspiration pneumonia is common. * **Contraindication:** Rigid endoscopy and NG tube insertion are risky due to the high chance of **perforation** of the thin-walled sac. * **Management:** Small symptomatic cases are treated with cricopharyngeal myotomy; larger sacs require diverticulectomy or endoscopic stapling (Dohlman’s procedure).

Question 136: Which of the following conditions does NOT typically present with bleeding per rectum?

A. Meckel's diverticulum
B. Sigmoid volvulus (Correct Answer)
C. Carcinoma rectum
D. Ulcerative colitis

Explanation: **Explanation:** The core clinical presentation of **Sigmoid Volvulus** is an **acute intestinal obstruction**, not gastrointestinal bleeding. It occurs when the sigmoid colon twists around its mesenteric axis, leading to a closed-loop obstruction. The classic triad of symptoms includes sudden onset abdominal pain, massive abdominal distension, and absolute constipation (obstipation). While ischemia can eventually lead to gangrene, the primary presentation is obstructive rather than hemorrhagic. **Analysis of Incorrect Options:** * **Meckel’s Diverticulum:** This is the most common cause of painless, profuse lower GI bleeding in children. It contains ectopic gastric mucosa which secretes acid, leading to ulceration of the adjacent ileal mucosa. * **Carcinoma Rectum:** This typically presents with "red currant jelly" stools or streaks of fresh blood mixed with stool, often accompanied by altered bowel habits and tenesmus. * **Ulcerative Colitis:** This is a chronic inflammatory bowel disease characterized by mucosal friability. Bloody diarrhea with mucus is the hallmark clinical feature of an active flare. **NEET-PG High-Yield Pearls:** * **Sigmoid Volvulus X-ray:** Shows the characteristic **"Coffee Bean sign"** or "Omega sign." * **Sigmoid Volvulus Management:** The initial treatment of choice for non-gangrenous cases is **Sigmoidoscopic detorsion** (flatus tube insertion). * **Meckel’s Diverticulum Diagnosis:** The investigation of choice for a bleeding Meckel's is a **Technetium-99m pertechnetate scan** (Meckel’s scan), which identifies ectopic gastric mucosa.

Question 137: A patient complains of epigastric pain radiating to the back. What is the investigation of choice?

A. MRI
B. CT Scan (Correct Answer)
C. USG
D. Radionuclide scan

Explanation: **Explanation:** The clinical presentation of **epigastric pain radiating to the back** is a classic hallmark of **Acute Pancreatitis**. The pancreas is a retroperitoneal organ; hence, inflammation leads to irritation of the posterior peritoneum, causing the characteristic radiation to the back. **Why CT Scan is the Correct Answer:** Contrast-Enhanced Computed Tomography (CECT) is the **investigation of choice** for acute pancreatitis. It is highly sensitive and specific for confirming the diagnosis, assessing the severity (using the Balthazar score or CT Severity Index), and identifying complications like necrosis, pseudocysts, or abscesses. For NEET-PG purposes, while diagnosis is often clinical (elevated amylase/lipase), CECT remains the gold standard imaging modality, typically performed 48–72 hours after symptom onset for maximum accuracy in detecting necrosis. **Why Other Options are Incorrect:** * **USG (Ultrasound):** This is usually the **initial investigation** to look for gallstones (the most common cause), but it is often limited by overlying bowel gas (ileus) which obscures the view of the pancreas. * **MRI:** While excellent for visualizing the biliary tree (MRCP), it is not the first-line investigation of choice due to cost, duration, and limited availability in emergency settings. * **Radionuclide Scan:** These are used for functional assessments (e.g., HIDA scan for cholecystitis) and have no primary role in the acute diagnosis of pancreatitis. **Clinical Pearls for NEET-PG:** * **Most sensitive enzyme:** Serum Lipase (remains elevated longer than Amylase). * **Initial investigation for etiology:** USG Abdomen (to rule out gallstones). * **Gold Standard for severity:** CECT Abdomen. * **Most common cause:** Gallstones (1st), Alcohol (2nd). * **Cullen’s sign & Grey Turner’s sign:** Indicate hemorrhagic pancreatitis (retroperitoneal hemorrhage).

Question 138: A patient presents with abdominal distention, nausea, and vomiting, reporting a long history of intermittent obstructive symptoms and distention. Radiological examination shows the following presentation. Which of the following statements regarding the treatment of this condition is false?

A. Management involves resuscitation followed by endoscopic detorsion.
B. A rigid proctoscope is a better tool than a flexible sigmoidoscope for this condition.
C. The risk of reoccurrence is up to 40%.
D. Sigmoid colectomy should be performed after confirming the diagnosis. (Correct Answer)

Explanation: ***Sigmoid colectomy should be performed after confirming the diagnosis*** - **Sigmoid colectomy** is not performed immediately after diagnosis; **endoscopic detorsion** is the first-line treatment for sigmoid volvulus. - **Emergency surgery** is only indicated if endoscopic reduction fails or if there are signs of **bowel perforation** or **necrosis**. *Management involves resuscitation followed by endoscopic detorsion* - This is the **correct first-line approach** for sigmoid volvulus, starting with fluid resuscitation and electrolyte correction. - **Endoscopic detorsion** successfully reduces the volvulus in 60-85% of cases and should be attempted before considering surgery. *A rigid proctoscope is a better tool than a flexible sigmoidoscope for this condition* - **Rigid proctoscope** is traditionally preferred for sigmoid volvulus detorsion as it provides better **torque control**. - The rigid instrument allows more effective **decompression** and **untwisting** of the sigmoid colon compared to flexible scopes. *The risk of reoccurrence is up to 40%* - **Recurrence rates** for sigmoid volvulus range from **40-90%** after successful endoscopic reduction. - The high recurrence rate is why **elective sigmoid colectomy** is often recommended after the acute episode resolves.

Question 139: Which of the following statements about gastric carcinoma is incorrect?

A. Hematemesis is present in the majority of patients. (Correct Answer)
B. Helicobacter pylori association is present.
C. D2 gastrectomy includes total gastrectomy.
D. All of the above are true.

Explanation: **Explanation:** **1. Why Option A is Incorrect (The Correct Answer):** While gastric carcinoma can cause bleeding, **hematemesis is NOT present in the majority of patients.** Most patients present with non-specific symptoms like dyspepsia, weight loss, or anemia due to chronic occult blood loss. Significant upper GI bleeding (hematemesis or melena) occurs in only about 10–15% of cases. Therefore, statement A is false. **2. Analysis of Other Options:** * **Option B (H. pylori association):** This is a **true** statement. *H. pylori* is classified as a Class I carcinogen by the WHO. It causes chronic atrophic gastritis and intestinal metaplasia, significantly increasing the risk of the intestinal type of gastric adenocarcinoma. * **Option C (D2 gastrectomy includes total gastrectomy):** This is a **true** statement regarding surgical nomenclature. A D2 gastrectomy refers to the extent of lymphadenectomy (removal of Level 1 and Level 2 lymph nodes). It can be performed as part of either a subtotal or a **total gastrectomy**, depending on the location of the tumor (e.g., proximal tumors require total gastrectomy). **Clinical Pearls for NEET-PG:** * **Most common site:** Historically the antrum, but the incidence of proximal/cardia tumors is rising. * **Most common histological type:** Adenocarcinoma (Intestinal type vs. Diffuse type/Linitis Plastica). * **Virchow’s Node:** Left supraclavicular lymphadenopathy (Troisier’s sign). * **Sister Mary Joseph’s Nodule:** Periumbilical metastasis. * **Krukenberg Tumor:** Metastasis to the ovaries (signet ring cells). * **Investigation of Choice:** Upper GI Endoscopy with biopsy. * **Staging:** Contrast-Enhanced CT (CECT) of the abdomen and chest is the standard for staging.

Question 140: What is the most common nutritional deficiency observed after a gastrectomy?

A. Iron deficiency (Correct Answer)
B. Vitamin B12 deficiency
C. Vitamin D deficiency
D. Vitamin K deficiency

Explanation: **Explanation:** The most common nutritional deficiency following a gastrectomy (total or subtotal) is **Iron deficiency**, affecting up to 50% of patients. **1. Why Iron Deficiency is the Correct Answer:** Iron absorption primarily occurs in the duodenum and proximal jejunum. Gastrectomy leads to iron deficiency through three main mechanisms: * **Achlorhydria:** Gastric acid is essential to convert dietary ferric iron ($Fe^{3+}$) into the more absorbable ferrous form ($Fe^{2+}$). * **Rapid Gastric Emptying:** Reduced transit time limits the duration of exposure to absorptive surfaces. * **Bypass of Duodenum:** In procedures like Billroth II, the primary site of iron absorption (the duodenum) is bypassed. **2. Analysis of Incorrect Options:** * **Vitamin B12 deficiency:** While classic, it is less common than iron deficiency. It occurs due to the loss of **Intrinsic Factor** (secreted by parietal cells), which is necessary for B12 absorption in the terminal ileum. However, the liver stores B12 for 3–5 years, so deficiency takes much longer to manifest clinically. * **Vitamin D deficiency:** This occurs due to fat malabsorption (steatorrhea) and inadequate mixing of bile/pancreatic enzymes, leading to osteomalacia. While significant, its incidence is lower than iron deficiency. * **Vitamin K deficiency:** Also a fat-soluble vitamin, its deficiency can occur but is rare because it is also synthesized by gut flora. **3. NEET-PG High-Yield Pearls:** * **Most common anemia post-gastrectomy:** Iron deficiency anemia (Microcytic Hypochromic). * **Megaloblastic anemia post-gastrectomy:** Usually due to Vitamin B12 deficiency, but can also be caused by **Folate deficiency** (due to poor intake). * **Dumping Syndrome:** The most common "post-gastrectomy syndrome" overall, managed primarily by dietary modification (small, frequent, dry meals).

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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