Gastrointestinal Surgery — MCQs

A 24-year-old man presents to the emergency department with a 12-hour history of intermittent, crampy abdominal pain and five episodes of vomiting. He denies any rectal bleeding. On examination, his abdomen is distended with absent bowel sounds. Per-rectal examination is normal. An abdominal X-ray reveals findings suggestive of a specific condition. Based on the X-ray findings, which of the following statements are true?

Q805Easy

Highest incidence of acute appendicitis occurs in which decade of life?

Q806Easy

What is the most common cause of upper gastrointestinal bleeding?

Q807Medium

Which investigations are needed in intestinal obstruction?

Q808Medium

What is the treatment of choice for a bleeding gastric ulcer?

Q809Medium

A 64-year-old male presented with severe diarrhea, having more than 20 bowel movements per day, following an elective operation for duodenal ulcer disease. Medications have been ineffective. The exact details of his operation cannot be ascertained. What operation was most likely performed?

Q810Easy

What is the indication for PAIR treatment in a hydatid cyst?

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 801: Malignant transformation is commonly seen in which type of ulcer?

A. Stomal ulcer
B. Gastric ulcer
C. Chronic duodenal ulcer
D. None of the above (Correct Answer)

Explanation: **Explanation:** The correct answer is **None of the above** because peptic ulcers (gastric, duodenal, or stomal) are essentially benign inflammatory conditions and do not undergo "malignant transformation." **1. Understanding the Concept:** In clinical practice, a gastric ulcer may be found to be malignant upon biopsy, but this is almost always because the lesion was a **primary gastric carcinoma** that underwent ulceration (ulcerated-type cancer), rather than a benign ulcer turning into cancer. True malignant transformation of a pre-existing chronic benign gastric ulcer is extremely rare (less than 1%). **2. Analysis of Options:** * **Gastric Ulcer (Option B):** While gastric ulcers carry a risk of being malignant at the time of diagnosis (necessitating mandatory biopsy), they do not "transform" from benign to malignant. * **Chronic Duodenal Ulcer (Option C):** Duodenal ulcers are virtually **never** malignant. If a lesion is found in the first part of the duodenum, it is almost certainly benign. * **Stomal Ulcer (Option A):** These occur at the site of a previous anastomosis (e.g., Gastrojejunostomy). Like duodenal ulcers, they are complications of acid-pepsin aggression and do not possess premalignant potential. **3. NEET-PG High-Yield Pearls:** * **Rule of Thumb:** All gastric ulcers must be biopsied (6–8 samples from the edge) to rule out malignancy, whereas duodenal ulcers do not require routine biopsy. * **Premalignant Conditions of the Stomach:** These include Adenomatous gastric polyps (especially >2cm), Chronic atrophic gastritis, Gastric remnants (post-gastrectomy after 15–20 years), and Menetrier’s disease. * **Most Common Site for Gastric Cancer:** Historically the antrum, though the incidence of proximal/cardia lesions is rising.

Question 802: All are true about acute appendicitis except:

A. Clinically indifferent from Meckel diverticulum in children
B. Lymphoid hyperplasia may cause acute appendicitis
C. Pain shifts to the right iliac fossa
D. Ultrasound is more diagnostic than CT scan (Correct Answer)

Explanation: In acute appendicitis, the diagnosis is primarily clinical, but imaging is often required in equivocal cases. **Explanation of the Correct Answer:** **Option D** is the incorrect statement because **CT scan (with contrast) is the gold standard** and is more diagnostic than Ultrasound (USG). CT has a sensitivity and specificity of >95%, whereas USG is operator-dependent, limited by obesity or bowel gas, and has lower sensitivity (approx. 85%). While USG is the preferred initial investigation in children and pregnant women to avoid radiation, CT remains the most accurate diagnostic tool overall. **Analysis of Other Options:** * **Option A:** Meckel’s diverticulitis often mimics appendicitis perfectly because both cause periumbilical pain shifting to the right iliac fossa (RIF) and signs of peritoneal irritation. It is the most common differential diagnosis to consider when a normal appendix is found during surgery. * **Option B:** In children and young adults, **lymphoid hyperplasia** (often following a viral infection) is the most common cause of luminal obstruction leading to appendicitis. In adults, fecaliths are more common. * **Option C:** This describes the classic **Murphy’s triad** (Pain, Vomiting, Fever). Pain typically begins in the periumbilical region (visceral pain) and later shifts to the RIF (somatic pain) due to parietal peritoneal irritation. **Clinical Pearls for NEET-PG:** * **Most common cause of obstruction:** Fecalith (Adults), Lymphoid hyperplasia (Children). * **Alvarado Score:** A score of $\geq$ 7 is highly suggestive of appendicitis. (Mnemonic: **MANTRELS**). * **Most common position:** Retrocecal (75%). * **Most common sign:** Right iliac fossa tenderness. * **Investigation of choice:** CT Scan (Adults/Non-pregnant), USG (Children/Pregnant).

Question 803: Which is the most common site for iatrogenic esophageal perforation?

A. Abdominal portion
B. Cervical portion (Correct Answer)
C. Above aortic arch
D. Below aortic arch

Explanation: **Explanation:** Iatrogenic injury is the most common cause of esophageal perforation, typically occurring during diagnostic or therapeutic endoscopy. **1. Why the Cervical Portion is Correct:** The **cervical esophagus** is the most common site for iatrogenic perforation, specifically at the **Killian’s triangle**. This is a physiological site of weakness located between the thyropharyngeus and cricopharyngeus muscles (parts of the inferior constrictor). During endoscopy, the most difficult step is passing the instrument through the **upper esophageal sphincter (cricopharyngeus)**. The posterior wall here is thin and lacks longitudinal muscle reinforcement, making it highly susceptible to perforation if the patient resists or if force is applied. **2. Analysis of Incorrect Options:** * **Abdominal Portion (Option A):** While this is a common site for spontaneous perforation (Boerhaave Syndrome), it is rarely the primary site for iatrogenic injury during routine endoscopy. * **Above/Below Aortic Arch (Options C & D):** These represent the thoracic esophagus. While the esophagus narrows slightly at the level of the aortic arch and the left main bronchus, these areas are more resilient than the cricopharyngeal region during intubation. Thoracic perforations are more common during secondary procedures like balloon dilation or stenting, but not as frequent as cervical injuries. **3. NEET-PG High-Yield Pearls:** * **Most common site overall (Iatrogenic):** Cervical esophagus (Killian’s Triangle). * **Most common site for Boerhaave Syndrome:** Left posterolateral aspect of the distal (abdominal/lower thoracic) esophagus, 2-3 cm above the GE junction. * **Most common cause of perforation:** Iatrogenic (Endoscopy/Instrumentation). * **Clinical Sign:** Subcutaneous emphysema (crepitus) in the neck is a classic early sign of cervical perforation. * **Investigation of Choice:** Gastrografin (water-soluble) swallow study.

Question 804: A 24-year-old man presents to the emergency department with a 12-hour history of intermittent, crampy abdominal pain and five episodes of vomiting. He denies any rectal bleeding. On examination, his abdomen is distended with absent bowel sounds. Per-rectal examination is normal. An abdominal X-ray reveals findings suggestive of a specific condition. Based on the X-ray findings, which of the following statements are true?

A. Distribution of intestinal loops is mainly in the center.
B. No visible plicae circulares.
C. Haustra are not visible. (Correct Answer)
D. String of beads sign is present.

Explanation: ***Haustra are not visible*** - In **small bowel obstruction**, haustra are absent because haustra are characteristic features of the **large bowel** (colon), not the small bowel. - The absence of haustra on X-ray helps differentiate **small bowel** from **large bowel obstruction**, making this a key diagnostic feature. *Distribution of intestinal loops is mainly in the center* - While small bowel loops are typically **centrally located**, this distribution can vary and is not as definitive as other radiological features. - **Large bowel** can also occupy central areas, making this feature less reliable for distinguishing small bowel obstruction. *No visible plicae circulares* - **Plicae circulares** (valvulae conniventes) are actually **visible** in small bowel obstruction and are a characteristic feature of the small bowel. - These **mucosal folds** extend across the full width of the small bowel lumen and help identify small bowel on X-ray. *String of beads sign is present* - The **string of beads sign** represents alternating **gas and fluid levels** and can be seen in small bowel obstruction, but it's not consistently present. - This sign is more suggestive than diagnostic and may not be visible in all cases of **small bowel obstruction**.

Question 805: Highest incidence of acute appendicitis occurs in which decade of life?

A. First decade
B. Second decade (Correct Answer)
C. Fifth decade
D. Sixth decade

Explanation: **Explanation:** The highest incidence of acute appendicitis occurs in the **second decade** of life (ages 10–19). This peak is primarily attributed to the anatomical and physiological changes in the lymphoid tissue. During adolescence, there is a significant proliferation and hyperplasia of the **submucosal lymphoid follicles** (Peyer’s patches) within the appendix. This lymphoid hyperplasia is the most common cause of luminal obstruction in younger patients, which triggers the inflammatory cascade leading to appendicitis. **Analysis of Options:** * **First decade (A):** While appendicitis occurs in children, it is less common in the very young. In infants, the appendix is funnel-shaped, making obstruction less likely. * **Second decade (B):** Correct. This is the peak period due to maximal lymphoid development. * **Fifth and Sixth decades (C & D):** The incidence declines with age as the lymphoid tissue undergoes atrophy and the appendiceal lumen tends to become obliterated by fibrosis. In these older age groups, obstruction is more commonly caused by **fecaliths** or **neoplasms** (e.g., adenocarcinoma or carcinoid) rather than lymphoid hyperplasia. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of obstruction:** Lymphoid hyperplasia (children/adolescents); Fecalith/Appendicolith (adults). * **Most common position:** Retrocecal (75%), followed by Pelvic (20%). * **First symptom:** Periumbilical pain (visceral pain via T10 dermatome), which later shifts to the Right Iliac Fossa (somatic pain). * **Most common surgical emergency:** Acute appendicitis remains the most frequent cause of an "acute abdomen" requiring surgery worldwide.

Question 806: What is the most common cause of upper gastrointestinal bleeding?

A. Gastric ulcer (Correct Answer)
B. Esophageal varices
C. Gastritis
D. Carcinoma of the stomach

Explanation: **Explanation:** **Peptic Ulcer Disease (PUD)** is the most common cause of upper gastrointestinal bleeding (UGIB) worldwide, accounting for approximately 50% of all cases. Among the subtypes of PUD, **gastric ulcers** are frequently cited as the leading specific cause in many clinical series, followed closely by duodenal ulcers. The bleeding occurs when the ulcer erodes into a vessel in the submucosa, most commonly the **left gastric artery** (for gastric ulcers) or the **gastroduodenal artery** (for posterior duodenal ulcers). **Analysis of Incorrect Options:** * **B. Esophageal varices:** While variceal bleeding is the most common cause of *massive* or life-threatening UGIB (especially in patients with portal hypertension/cirrhosis), it accounts for only 10–15% of total UGIB cases. * **C. Gastritis:** Erosive gastritis and gastropathy (often due to NSAIDs or alcohol) are common causes but are statistically less frequent than discrete peptic ulcers. * **D. Carcinoma of the stomach:** Malignancy is a significant cause of chronic occult bleeding (anemia), but it is an uncommon cause of acute, overt upper GI hemorrhage. **Clinical Pearls for NEET-PG:** * **Rockall Score and Glasgow-Blatchford Score:** These are the two primary scoring systems used to risk-stratify patients with UGIB. * **Dieulafoy’s Lesion:** A rare but high-yield cause of UGIB involving a large tortuous submucosal artery that erodes through the mucosa. * **Management:** The first step in management is always **hemodynamic stabilization** (ABC), followed by early endoscopy (within 24 hours) for both diagnosis and therapeutic intervention.

Question 807: Which investigations are needed in intestinal obstruction?

A. Intestinal barium meal, erect X-ray abdomen, and supine X-ray abdomen (Correct Answer)
B. Barium swallow, erect X-ray abdomen, and supine X-ray abdomen
C. Barium swallow, intestinal barium meal, and erect X-ray abdomen
D. Intestinal barium meal, barium swallow, and erect X-ray abdomen

Explanation: **Explanation:** The diagnosis of intestinal obstruction relies on a combination of clinical assessment and radiological imaging to determine the site, level, and cause of the blockage. 1. **Why Option A is Correct:** * **Plain X-rays (Erect and Supine Abdomen):** These are the initial investigations of choice. The **erect film** is essential to visualize **multiple air-fluid levels** (stepladder pattern) and pneumoperitoneum (gas under the diaphragm). The **supine film** helps identify the distribution of gas, allowing the clinician to differentiate between small bowel (central loops, valvulae conniventes) and large bowel (peripheral loops, haustrations) obstruction. * **Intestinal Barium Meal (Follow-through):** While CT is now the gold standard, a barium meal/follow-through is used in subacute or chronic cases to identify the specific site of obstruction or transit time abnormalities. 2. **Why Other Options are Incorrect:** * **Barium Swallow (Options B, C, and D):** This investigation is specifically designed to evaluate the **esophagus** and the upper part of the stomach. It has no diagnostic value in intestinal obstruction, which typically involves the small or large bowel. Including it in the workup for a suspected distal obstruction is clinically irrelevant. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Contrast-Enhanced CT (CECT) of the abdomen is the most accurate investigation for diagnosing the cause and site of obstruction. * **Classic X-ray Sign:** "String of beads" or "String of pearls" sign is highly suggestive of small bowel obstruction (gas trapped between valvulae conniventes). * **Contraindication:** Barium should **never** be given orally if a complete or large bowel obstruction is suspected, as it can inspissate and worsen the blockage. Gastrografin (water-soluble contrast) is preferred in such cases. * **Cut-off for Air-Fluid Levels:** More than 2–3 fluid levels are considered pathological in an adult.

Question 808: What is the treatment of choice for a bleeding gastric ulcer?

A. Gastrectomy
B. Antrectomy
C. Under-running of the ulcer (Correct Answer)
D. Vagotomy and drainage

Explanation: **Explanation:** The management of a bleeding gastric ulcer focuses on immediate hemostasis. **Under-running of the ulcer** (also known as suture ligation) is the treatment of choice because it is the quickest and most effective surgical method to control active hemorrhage, especially in emergency settings where the patient may be hemodynamically unstable. * **Why Option C is correct:** The procedure involves a gastrotomy followed by placing non-absorbable sutures (usually in a figure-of-eight fashion) to ligate the bleeding vessel (often the left gastric artery or its branches) at the ulcer base. This stops the life-threatening bleed without the morbidity associated with major resections. * **Why Options A & B are incorrect:** Gastrectomy and Antrectomy are major resectional surgeries. While they definitive treat the ulcer, they are time-consuming and carry high mortality rates in an exsanguinating patient. They are generally reserved for cases where primary ligation fails or if malignancy is suspected. * **Why Option D is incorrect:** Vagotomy and drainage (like pyloroplasty) were historically used to reduce acid secretion. However, in an acute bleed, acid reduction is secondary to mechanical hemostasis. Furthermore, with the advent of PPIs and *H. pylori* eradication, the need for routine surgical vagotomy has significantly declined. **High-Yield Pearls for NEET-PG:** 1. **First-line management:** Endoscopic therapy (Adrenaline injection, clips, or thermal coagulation) is the overall first-line treatment. Surgery is indicated only if endoscopic therapy fails. 2. **Vessel involved:** For gastric ulcers on the lesser curvature, the **Left Gastric Artery** is the most common source of bleeding. For duodenal ulcers (posterior wall), it is the **Gastroduodenal Artery**. 3. **Biopsy:** Unlike duodenal ulcers, all gastric ulcers must be biopsied (or the edges excised) to rule out **Gastric Adenocarcinoma**.

Question 809: A 64-year-old male presented with severe diarrhea, having more than 20 bowel movements per day, following an elective operation for duodenal ulcer disease. Medications have been ineffective. The exact details of his operation cannot be ascertained. What operation was most likely performed?

A. Antrectomy and Billroth I anastomosis
B. Gastric surgery combined with cholecystectomy
C. Truncal vagotomy (Correct Answer)
D. Highly selective vagotomy

Explanation: **Explanation:** The patient is presenting with **Post-Vagotomy Diarrhea**, a known complication of gastric acid-reduction surgeries. **Why Truncal Vagotomy is correct:** Truncal vagotomy (TV) involves the division of the main vagal trunks at the esophageal hiatus. This results in the denervation of not only the stomach but also the biliary tree, small intestine, and proximal colon. The loss of vagal innervation leads to: 1. **Rapid gastric emptying** of hypertonic liquids (osmotic load). 2. **Increased bile acid malabsorption**, which irritates the colon and stimulates secretion. 3. **Altered intestinal motility.** While mild diarrhea occurs in 20-30% of patients, **severe, "explosive" diarrhea** (as seen in this case) occurs in about 5-10% of patients after Truncal Vagotomy. **Why other options are incorrect:** * **Antrectomy and Billroth I:** While this can cause Dumping Syndrome, the primary symptom is usually vasomotor (palpitations, sweating) and abdominal cramping rather than isolated, severe diarrhea. * **Gastric surgery with Cholecystectomy:** While cholecystectomy can cause mild "cholecystogenic diarrhea" due to continuous bile flow, it rarely presents with 20+ bowel movements per day unless combined with a truncal vagotomy. * **Highly Selective Vagotomy (HSV):** This is the most physiological procedure. It denervates only the acid-secreting parietal cell mass while **preserving the hepatic and celiac branches** (and the nerve of Latarjet). Consequently, it has the lowest incidence of post-operative diarrhea (<1%). **NEET-PG High-Yield Pearls:** * **Most common complication** of Truncal Vagotomy: Diarrhea. * **Most common metabolic complication** after Gastrectomy: Iron deficiency anemia. * **Treatment for Post-Vagotomy Diarrhea:** Initially conservative (dietary modification, Loperamide). If refractory, **Cholestyramine** (to bind bile acids) or **Octreotide** are used. Surgical option: Reversed jejunal interposition (10 cm).

Question 810: What is the indication for PAIR treatment in a hydatid cyst?

A. Size > 5 cm (Correct Answer)
B. Multiloculated
C. Cyst in lung
D. Recurrence after surgery

Explanation: **Explanation:** **PAIR (Puncture, Aspiration, Injection, Re-aspiration)** is a minimally invasive percutaneous treatment for cystic echinococcosis (hydatid cyst), primarily caused by *Echinococcus granulosus*. 1. **Why Option A is Correct:** The primary indication for PAIR is a **Type CE1 (unilocular)** or **Type CE3a (early transitional)** cyst that is **> 5 cm in diameter**. Cysts smaller than 5 cm are often managed conservatively ("watch and wait") or with medical therapy (Albendazole) alone. PAIR is most effective in large, unilocular cysts where the fluid can be easily aspirated and the germinal layer can be reached by the scolicidal agent. 2. **Why Other Options are Incorrect:** * **B. Multiloculated:** This corresponds to WHO Type CE2. These cysts contain multiple daughter cysts and internal septations, making it impossible to aspirate all compartments effectively. Surgery or Modified Catheterization Technique (MCT) is preferred. * **C. Cyst in lung:** PAIR is **contraindicated** in the lungs due to the high risk of cyst rupture into the bronchial tree, leading to anaphylaxis or severe chemical pneumonitis. It is primarily used for liver, bone, and kidney cysts. * **D. Recurrence after surgery:** While PAIR can be used in some recurrences, it is not a standard "indication" for the procedure itself. Management of recurrence depends on the cyst type and location. **High-Yield Clinical Pearls for NEET-PG:** * **WHO Classification:** PAIR is indicated for **CE1 and CE3a**. It is contraindicated in **CE2, CE3b** (multiloculated), and **CE4, CE5** (calcified/inactive). * **Scolicidal Agents:** Commonly used agents include 20% hypertonic saline or 95% ethanol. * **Prophylaxis:** Albendazole must be started **1 week before** and continued for **4 weeks after** PAIR to prevent secondary hydatidosis from accidental spillage. * **Absolute Contraindication:** Superficial cysts (risk of rupture) and cysts communicating with the biliary tree.

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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