Gastrointestinal Surgery Practice Questions

Q: Dysphagia lusoria is caused by which of the following?

Aberrant great vessels. **Explanation:** **Dysphagia lusoria** (derived from *lusus naturae*, meaning "freak of nature") refers to difficulty swallowing caused by extrinsic compression of the esophagus by an **aberrant right subclavian artery**. 1. **Why the Correct Answer is Right:** In this congenital vascular anomaly, the right subclavian artery arises from the descending aorta (distal to the left subclavian) rather than the brachiocephalic trunk. To reach the right arm, it travels behind the esophagus (retro-esophageal) in 80% of cases, creating a "vascular sling" that compresses the esophageal lumen. While often asymptomatic in childhood, symptoms typically manifest in adulthood due to age-related atherosclerotic stiffening or aneurysmal changes (Kommerell’s diverticulum) of the vessel. 2. **Why Incorrect Options are Wrong:** * **Esophageal webs (A):** These are thin mucosal folds (common in Plummer-Vinson syndrome) that cause internal luminal narrowing, not extrinsic vascular compression. * **Achalasia (B):** This is a primary motility disorder caused by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of peristalsis. * **Esophageal stricture (C):** These are usually secondary to chronic acid reflux (GERD) or corrosive ingestion, leading to fibrotic narrowing of the wall. **Clinical Pearls for NEET-PG:** * **Diagnosis:** Barium swallow typically shows a **posterior indentation** on the esophagus. CT/MRI angiography is the gold standard for definitive vascular mapping. * **Treatment:** Surgical management (reconstruction or transposition of the artery) is only indicated for severe, symptomatic cases. * **Association:** Often associated with **Kommerell’s diverticulum** (a dilation at the origin of the aberrant vessel).

Q: Curling's ulcer is commonly found in which part of the duodenum?

1st part. **Explanation:** **Curling’s ulcer** is a stress-induced acute erosion or ulceration of the gastrointestinal tract occurring as a complication of **severe burns**. The underlying pathophysiology involves severe hypovolemia leading to mucosal ischemia and reduced protective bicarbonate production, making the lining susceptible to gastric acid. * **Why the 1st part of the Duodenum is correct:** Statistically and clinically, Curling’s ulcers most frequently involve the **proximal duodenum (1st part)**, though they can also occur in the stomach. The first part of the duodenum is the most common site because it is the most physiologically exposed to acidic gastric contents immediately upon emptying from the pylorus. * **Why other options are incorrect:** The 2nd and 3rd parts of the duodenum are further from the stomach and are partially protected by the neutralizing effect of alkaline bile and pancreatic secretions (which enter at the Ampulla of Vater in the 2nd part). Therefore, primary stress ulceration rarely initiates in these distal segments. **High-Yield Clinical Pearls for NEET-PG:** 1. **Curling vs. Cushing:** * **Curling’s Ulcer:** Associated with **Burns** (Think: *Curling* iron causes burns). * **Cushing’s Ulcer:** Associated with **Increased Intracranial Pressure (ICP)** or head trauma. These are typically deeper and have a higher risk of perforation. 2. **Mechanism:** Curling’s is due to **ischemia** (reduced mucosal blood flow), whereas Cushing’s is due to **vagal overstimulation** leading to hypersecretion of gastric acid. 3. **Prophylaxis:** In modern burn units, the incidence has significantly decreased due to the routine use of H2 blockers, Proton Pump Inhibitors (PPIs), and early enteral feeding.

Q: What is the treatment of gallstone ileus?

Removal of obstruction. **Explanation:** Gallstone ileus is a mechanical intestinal obstruction caused by the impaction of a large gallstone (usually >2.5 cm) in the bowel lumen, most commonly at the **ileocecal valve** (the narrowest part of the small intestine). The stone enters the bowel through a cholecystoenteric fistula. **1. Why "Removal of obstruction" is correct:** The primary goal in the acute setting is to relieve the life-threatening intestinal obstruction. These patients are typically elderly, dehydrated, and have multiple comorbidities. Therefore, the safest and most widely accepted initial procedure is an **enterolithotomy** (removal of the stone via a longitudinal incision in the proximal healthy bowel). This "simple" approach has significantly lower morbidity and mortality compared to more extensive procedures. **2. Why the other options are incorrect:** * **Options A, C, and D:** These involve performing a cholecystectomy and/or fistula repair simultaneously with the enterolithotomy. While this "one-stage" procedure prevents future biliary complications, it is associated with much higher mortality rates in the emergency setting. Definitive biliary surgery is generally reserved for stable, younger patients or performed as a delayed "two-stage" procedure only if the patient remains symptomatic. **Clinical Pearls for NEET-PG:** * **Rigler’s Triad (X-ray findings):** 1. Pneumobilia (air in biliary tree), 2. Small bowel obstruction, 3. Ectopic calcified gallstone. * **Most common site of obstruction:** Terminal ileum. * **Most common fistula:** Cholecystoduodenal fistula. * **Management:** Enterolithotomy is the gold standard. Spontaneous closure of the fistula occurs in over 50% of cases once the distal obstruction is relieved.

Q: Which of the following tumors is most commonly associated with pseudo myxoma peritonei?

Appendix. **Explanation:** **Pseudomyxoma Peritonei (PMP)** is a clinical syndrome characterized by the progressive accumulation of mucinous (gelatinous) ascites within the peritoneal cavity. This condition most commonly results from the rupture of a mucinous tumor, leading to the "redistribution phenomenon" where mucin-producing cells implant on peritoneal surfaces. 1. **Why Appendix is Correct:** The **Appendix** is the most common primary site of origin for PMP (accounting for >90% of cases). It typically arises from a **Low-grade Appendiceal Mucinous Neoplasm (LAMN)** or an appendiceal adenocarcinoma. When these tumors rupture, they leak mucus and neoplastic cells into the abdomen, causing the characteristic "jelly belly" appearance. 2. **Why Other Options are Incorrect:** * **Gallbladder, Stomach, and Pancreas:** While mucinous carcinomas can arise from these organs and occasionally cause peritoneal carcinomatosis, they are rare causes of the classic PMP syndrome. Historically, the ovary was thought to be a primary site, but current evidence suggests most ovarian mucinous tumors associated with PMP are actually metastases from an appendiceal primary. **Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Often presents as increasing abdominal girth, "jelly belly," or an incidental finding during hernia repair or appendectomy. * **Redistribution Phenomenon:** Neoplastic cells follow the normal flow of peritoneal fluid and settle at sites of fluid absorption (e.g., omentum, undersurface of the diaphragm) while sparing the mobile small bowel. * **Treatment of Choice:** Cytoreductive Surgery (CRS) combined with **Hyperthermic Intraperitoneal Chemotherapy (HIPEC)**. * **Tumor Marker:** CEA and CA-19-9 are often elevated and used for monitoring.

Q: Which of the following is FALSE about paraduodenal hernia?

Common in right side. **Explanation:** Paraduodenal hernias are the most common type of internal hernia, accounting for approximately 50% of cases. They result from the entrapment of small bowel loops into congenital fossae formed by folds of the peritoneum during midgut rotation. **Why Option D is False:** Paraduodenal hernias are significantly more common on the **left side** (75%) than on the right side (25%). * **Left-sided hernias** occur through the **Fossa of Landzert**, located to the left of the fourth part of the duodenum. * **Right-sided hernias** occur through the **Fossa of Waldeyer** (also known as the mesentericoparietal fossa), located behind the superior mesenteric artery in the first part of the jejunal mesentery. **Analysis of Other Options:** * **Option A (Congenital):** This is true. They are developmental defects arising from abnormal rotation and fixation of the midgut and its mesentery. * **Option B (Fossa of Kolb):** This is true. The Fossa of Landzert is also referred to as the Fossa of Kolb or the paraduodenal fossa. * **Option C (Fossa of Landzert):** This is true. As mentioned, this is the specific anatomical site for the more common left-sided paraduodenal hernia. **High-Yield Clinical Pearls for NEET-PG:** * **Vascular Landmarks:** In a **Left** paraduodenal hernia, the **Inferior Mesenteric Vein** and left colic artery lie in the anterior margin of the orifice. In a **Right** paraduodenal hernia, the **Superior Mesenteric Artery** and vein lie in the anterior margin. * **Presentation:** Often presents as chronic, intermittent abdominal pain or acute intestinal obstruction. * **Diagnosis:** CT scan is the gold standard, showing a "cluster" of dilated small bowel loops encased in a sac-like appearance.

Q: Which of the following is NOT a feature of paralytic ileus?

Colicky pain. **Explanation:** The core distinction between **Paralytic Ileus** and **Mechanical Bowel Obstruction** lies in the presence or absence of peristalsis. Paralytic ileus is a state of functional adynamic bowel where there is a failure of peristaltic activity without a physical blockage. **Why "Colicky Pain" is the correct answer:** Colicky pain is a hallmark of **mechanical obstruction**, where the bowel contracts vigorously against a physical barrier to overcome it. In contrast, paralytic ileus is characterized by a lack of motor activity; therefore, the patient typically experiences **vague, dull, generalized abdominal discomfort** or distension, but **never true colicky pain.** **Analysis of Incorrect Options:** * **A. Hypoactive bowel sounds:** Since there is no peristalsis, bowel sounds are characteristically absent or "silent." In mechanical obstruction, sounds are initially hyperactive (borborygmi). * **B. Presence of gas in the rectum:** In paralytic ileus, gas is distributed throughout the entire GI tract, including the colon and rectum. In complete mechanical obstruction, gas is absent distal to the site of blockage. * **D. Dilated bowel loops with multiple air-fluid levels:** X-rays in ileus show generalized dilatation of both the small and large bowel. While air-fluid levels are more classic for mechanical obstruction, they can also be seen in ileus due to stagnant fluid and gas. **Clinical Pearls for NEET-PG:** * **Most common cause:** Post-operative state (Physiological ileus: Small bowel recovers in 0–24h, Stomach in 24–48h, Colon in 48–72h). * **Metabolic triggers:** Hypokalemia (most common electrolyte abnormality), hyponatremia, and uremia. * **Management:** Usually conservative (NPO, IV fluids, electrolyte correction, and nasogastric decompression). Prokinetics like Erythromycin or Neostigmine may be used in specific cases (e.g., Ogilvie’s Syndrome).

Q: What is the most common type of gastric tumor in adults?

Adenocarcinoma. **Explanation:** **Adenocarcinoma** is the most common type of gastric tumor, accounting for approximately **90–95%** of all malignant gastric neoplasms in adults. It originates from the glandular epithelium of the gastric mucosa. Risk factors include *H. pylori* infection, smoking, high salt intake, and chronic atrophic gastritis. **Analysis of Incorrect Options:** * **Stromal tumor (GIST):** While Gastrointestinal Stromal Tumors are the most common mesenchymal tumors of the GI tract, they account for only about 1–3% of all gastric malignancies. They originate from the interstitial cells of Cajal. * **Lymphoma:** The stomach is the most common site for extranodal lymphomas (predominantly MALToma and DLBCL), but these represent only about 1–5% of gastric cancers. * **Leiomyosarcoma:** These are rare smooth muscle malignancies. Most tumors previously classified as leiomyosarcomas are now identified as GISTs through immunohistochemistry (CD117/c-kit positivity). **High-Yield Clinical Pearls for NEET-PG:** * **Lauren Classification:** Divides gastric adenocarcinoma into **Intestinal** (associated with environmental factors/metaplasia) and **Diffuse** (associated with younger age and Signet ring cells). * **Virchow’s Node:** Left supraclavicular lymphadenopathy, a classic sign of metastatic gastric cancer. * **Sister Mary Joseph Nodule:** Periumbilical metastasis. * **Krukenberg Tumor:** Metastasis to the ovaries (classically from the diffuse type). * **Investigation of Choice:** Upper GI Endoscopy with biopsy.

Question 1

Dysphagia lusoria is caused by which of the following?

Accepted Answer

Aberrant great vessels

Answer

Esophageal webs

Answer

Achalasia

Answer

Esophageal stricture

Question 2

Curling's ulcer is commonly found in which part of the duodenum?

Accepted Answer

1st part

Answer

2nd part

Answer

3rd part

Answer

Between the 1st and 2nd part

Question 3

The Rossetti modification of Nissen's fundoplication involves which of the following?

Accepted Answer

Including only the anterior stomach wall in the wrap

Answer

Excluding the stomach wall in the wrap

Answer

Including only the posterior stomach wall in the wrap

Answer

Including both the anterior and the posterior stomach wall in the wrap

Question 4

Laparoscopic operation for gastrointestinal reflux should be considered in a patient with any of the following situations, EXCEPT:

Accepted Answer

Significant esophageal shortening

Answer

Barrett's esophagus

Answer

Daily proton pump inhibitors for symptomatic relief

Answer

Esophageal stricture

Question 5

A 65-year-old man diagnosed with adenocarcinoma of the distal esophagus experienced a 25-lb weight loss over the previous 6 months. He underwent a transhiatal esophagectomy complicated by a cervical leak and is receiving enteral feeds through a jejunostomy tube. After one week, his physicians wish to assess his nutritional resuscitation. Which of the following is the most accurate measure of the adequacy of his nutritional support?

Accepted Answer

Serum albumin level

Answer

Urinary nitrogen excretion level

Answer

Total serum protein level

Answer

Serum transferrin level

Question 6

What is the treatment of gallstone ileus?

Accepted Answer

Removal of obstruction

Answer

Cholecystectomy

Answer

Cholecystectomy, closure of fistula, and removal of stone by enterotomy

Answer

Cholecystectomy with closure of fistula

Question 7

Which of the following tumors is most commonly associated with pseudo myxoma peritonei?

Accepted Answer

Appendix

Answer

Gall bladder

Answer

Stomach

Answer

Pancreas

Question 8

Which of the following is FALSE about paraduodenal hernia?

Accepted Answer

Common in right side

Answer

Congenital

Answer

Found in fossa of Kolb

Answer

Found in fossa of Landzert

Question 9

Which of the following is NOT a feature of paralytic ileus?

Accepted Answer

Colicky pain

Answer

Hypoactive bowel sounds

Answer

Presence of gas in the rectum

Answer

Dilated bowel loops with multiple air-fluid levels on X-ray

Question 10

What is the most common type of gastric tumor in adults?

Accepted Answer

Adenocarcinoma

Answer

Stromal tumor

Answer

Leiomyosarcoma

Answer

Lymphoma

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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