Gastrointestinal Surgery Practice Questions

Q: All of the following are causes of duodenal obstruction syndrome, except?

Malnutrition. **Explanation:** The question refers to **Superior Mesenteric Artery (SMA) Syndrome**, also known as Wilkie’s syndrome or Cast syndrome. This condition occurs when the third part of the duodenum is compressed between the **Abdominal Aorta** and the **Superior Mesenteric Artery** at an acute angle (normally 38°–56°). **Why Malnutrition is the Correct Answer (The Exception):** The primary pathophysiological trigger for SMA syndrome is the **loss of the retroperitoneal mesenteric fat pad**, which normally acts as a cushion to keep the SMA away from the aorta. Therefore, **malnutrition is a cause** of the syndrome, not an exception. Rapid weight loss (due to eating disorders, cancer, or burns) leads to the depletion of this fat pad, narrowing the aortomesenteric angle and causing obstruction. **Analysis of Other Options:** * **High attachment of mesentery (Ligament of Treitz):** An abnormally high or short ligament of Treitz suspends the duodenum in a more superior position, placing it directly within the narrowest part of the aortomesenteric angle. * **Long mesentery:** A long, heavy mesentery can cause the SMA to sag downward (visceroptosis), which decreases the angle and increases the risk of compression. * **Pancreatic cancer:** Tumors of the head of the pancreas or surrounding lymphadenopathy can cause extrinsic compression of the duodenum, mimicking or exacerbating the syndrome. **NEET-PG High-Yield Pearls:** * **Normal Aortomesenteric Angle:** 38°–56°. In SMA syndrome, it is typically **<25°**. * **Normal Aortomesenteric Distance:** 10–28 mm. In SMA syndrome, it is **<8 mm**. * **Clinical Presentation:** Postprandial fullness, vomiting, and relief of pain in the **left lateral decubitus** or knee-chest position (which opens the angle). * **Management:** Initial treatment is conservative (nutritional support/weight gain); surgery (Duodenojejunostomy) is reserved for refractory cases.

Q: Which of the following is NOT a risk factor for carcinoma of the stomach?

Duodenal peptic ulcer. **Explanation:** The correct answer is **Duodenal peptic ulcer**. In surgical pathology, duodenal ulcers (DU) are associated with high gastric acid secretion (hyperchlorhydria). Gastric cancer, conversely, thrives in an environment of low acid (hypochlorhydria) and mucosal atrophy. Therefore, patients with a history of DU actually have a **decreased risk** of developing gastric adenocarcinoma. **Analysis of Options:** * **Blood Group A:** There is a well-established genetic association between Blood Group A and the **diffuse type** of gastric cancer (Lauren classification). * **Atrophic Gastritis:** This is a precursor lesion. Chronic inflammation leads to intestinal metaplasia and dysplasia, significantly increasing the risk of the **intestinal type** of gastric cancer. * **Partial Gastrectomy:** Patients who have undergone a distal gastrectomy (especially Billroth II reconstruction) for benign disease are at increased risk after 15–20 years. This is due to chronic **alkaline reflux** (bile reflux) causing "stump cancer" in the remnant stomach. **NEET-PG High-Yield Pearls:** 1. **H. pylori Paradox:** While *H. pylori* is the #1 risk factor for both, the strain and host response determine the outcome. Antral-predominant infection leads to DU (low cancer risk), while pangastritis leads to atrophy and cancer. 2. **Lauren Classification:** * **Intestinal Type:** Associated with environmental factors (diet, *H. pylori*), older age, and hematogenous spread. * **Diffuse Type:** Associated with Blood Group A, younger age, and transmural/lymphatic spread (e.g., Linitis Plastica). 3. **Dietary Factors:** High intake of nitrates/nitrites (smoked foods) and low Vitamin C intake are significant risk factors.

Q: Which blood group is associated with gastric cancer?

A. **Explanation:** The association between **Blood Group A** and **Gastric Cancer** (specifically the intestinal type) is a classic high-yield association in surgical oncology. **1. Why Blood Group A is Correct:** Epidemiological studies have consistently shown that individuals with Blood Group A have an approximately **20% higher risk** of developing gastric adenocarcinoma compared to other blood groups. While the exact molecular mechanism is still being researched, it is hypothesized that the A-antigen may facilitate the binding of *Helicobacter pylori* to the gastric mucosa or influence the inflammatory response, leading to chronic atrophic gastritis and subsequent neoplasia. **2. Why Other Options are Incorrect:** * **Blood Group O:** This group is strongly associated with **Peptic Ulcer Disease (PUD)**, specifically **Duodenal Ulcers**. This is often a point of confusion; remember: **A** for **A**denocarcinoma and **O** for **O**lcer (Ulcer). * **Blood Groups B and AB:** There are no significant or consistently proven clinical associations between these blood groups and the risk of gastric malignancy in standard surgical literature. **3. Clinical Pearls for NEET-PG:** * **Lauren Classification:** The association with Blood Group A is more prominent in the **Intestinal type** of gastric cancer (associated with environmental factors) rather than the Diffuse type. * **Most Common Site:** The most common site for gastric cancer globally is the **Antrum**, but the incidence of proximal (cardia) lesions is rising. * **Virchow’s Node:** Left supraclavicular lymphadenopathy is a classic sign of metastatic gastric cancer. * **Sister Mary Joseph Nodule:** Periumbilical metastasis indicating advanced disease. * **Dietary Factors:** High intake of nitrates, smoked foods, and low Vitamin C are other major risk factors.

Q: Boerhaave's syndrome is due to what?

Spontaneous perforation. **Explanation:** **Boerhaave’s syndrome** is defined as a **spontaneous transmural perforation** of the esophagus. The underlying mechanism involves a sudden, massive increase in intra-esophageal pressure combined with negative intrathoracic pressure, typically caused by forceful vomiting or retching against a closed glottis (the Mackler triad: vomiting, chest pain, and subcutaneous emphysema). * **Why Option C is correct:** It is termed "spontaneous" because it does not result from direct trauma or instrumentation (iatrogenic). The perforation most commonly occurs in the **left posterolateral aspect of the distal esophagus**, approximately 2–3 cm above the gastroesophageal junction, which is the anatomically weakest point. **Analysis of Incorrect Options:** * **Option A:** Drug-induced perforation (pill esophagitis) usually causes localized mucosal ulceration rather than full-thickness rupture. * **Option B:** Corrosive injury leads to chemical burns and strictures; while it can cause perforation, it is categorized as caustic ingestion, not Boerhaave’s. * **Option D:** GERD leads to esophagitis, Barrett’s esophagus, or strictures, but not acute transmural rupture. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The initial investigation of choice is a **Gastrografin (water-soluble) swallow**, which shows extravasation of dye. Chest X-ray may show a "V sign of Naclerio" or pneumomediastinum. * **Distinction:** Unlike **Mallory-Weiss syndrome** (which involves only a mucosal/submucosal tear and presents with hematemesis), Boerhaave’s is a **full-thickness rupture** and is a surgical emergency. * **Management:** If diagnosed within 24 hours, primary surgical repair is preferred. Beyond 24 hours, management often involves drainage and diversion due to mediastinitis.

Q: What is true about small bowel diverticula?

Contains all the layers of the bowel wall. **Explanation:** Small bowel diverticula are classified into two types: **congenital** and **acquired**. The most common small bowel diverticulum is **Meckel’s diverticulum**, which is a **true diverticulum**. * **Why Option A is Correct:** By definition, a **true diverticulum** (like Meckel’s) involves all layers of the intestinal wall, including the mucosa, submucosa, and the muscularis propria. This distinguishes it from acquired (false) diverticula, which are typically mucosal herniations through muscular defects. * **Why Option B is Incorrect:** Meckel’s diverticulum is characteristically found in the **ileum**, specifically within 2 feet (60 cm) of the ileocecal valve, but not typically at the terminal ileum itself. Acquired diverticula (jejunal) are most common in the proximal jejunum. * **Why Option C is Incorrect:** Small bowel diverticula can be visualized radiographically using **Technetium-99m pertechnetate scans** (Meckel’s scan), CT scans (showing enteroliths or inflammation), or enteroclysis. * **Why Option D is Incorrect:** While asymptomatic cases may be managed conservatively, surgical treatment (diverticulectomy or segmental resection) is **mandatory** if complications arise, such as diverticulitis, perforation, hemorrhage, or intestinal obstruction. **High-Yield Clinical Pearls for NEET-PG:** 1. **Meckel’s Diverticulum Rule of 2s:** 2% of the population, 2 inches long, 2 feet from the ileocecal valve, 2 types of ectopic tissue (Gastric > Pancreatic), and presents before age 2. 2. **Most common presentation:** In children, it is painless lower GI bleeding; in adults, it is intestinal obstruction. 3. **Jejunal Diverticula:** These are usually "false" diverticula and are associated with bacterial overgrowth leading to Vitamin B12 deficiency and malabsorption.

Q: Which artery is most likely to bleed in a duodenal ulcer hemorrhage?

Gastroduodenal artery. ### Explanation **1. Why Gastroduodenal Artery (GDA) is Correct:** The most common site for a chronic peptic ulcer is the **first part of the duodenum (D1)**. While anterior wall ulcers are more prone to perforation, **posterior wall ulcers** are more likely to erode into adjacent vascular structures. The **Gastroduodenal Artery** runs vertically directly behind the first part of the duodenum. When a posterior duodenal ulcer penetrates the muscularis and serosa, it erodes into the GDA, leading to massive, life-threatening upper gastrointestinal hemorrhage. **2. Analysis of Incorrect Options:** * **Splenic Artery:** This artery runs along the superior border of the pancreas. It is the most common site of visceral artery aneurysms and can be involved in gastric ulcers on the posterior wall of the *stomach* or pancreatic pathology, but not duodenal ulcers. * **Left Gastric Artery:** This is the most common source of bleeding in **gastric ulcers** (typically located on the lesser curvature of the stomach). * **Superior Mesenteric Artery (SMA):** The SMA lies much lower, passing over the third part of the duodenum. It is associated with "SMA Syndrome" (compression of D3) but is not involved in D1 ulcer bleeds. **3. NEET-PG High-Yield Pearls:** * **Anterior Duodenal Ulcer:** Most likely to **Perforate** (presents with pneumoperitoneum). * **Posterior Duodenal Ulcer:** Most likely to **Bleed** (due to GDA erosion). * **Most common cause of Upper GI Bleed:** Peptic Ulcer Disease. * **Management:** Initial stabilization followed by endoscopy. If endoscopic thermal/clip therapy fails, surgical ligation of the GDA (via a duodenotomy) is required.

Question 1

All of the following are causes of duodenal obstruction syndrome, except?

Accepted Answer

Malnutrition

Answer

High attachment of mesentery

Answer

Long mesentery

Answer

Pancreatic cancer

Question 2

Which of the following is NOT a risk factor for carcinoma of the stomach?

Accepted Answer

Duodenal peptic ulcer

Answer

Blood group A

Answer

Atrophic gastritis

Answer

Partial gastrectomy

Question 3

Which statement is true regarding esophageal leiomyoma?

Accepted Answer

On CT, it appears as an ovoid intramural mass with a smooth outline.

Answer

Commonly found in the proximal third of the esophagus.

Answer

It represents an overgrowth of skeletal muscle.

Answer

The overall prognosis is typically poor.

Question 4

What is the investigation of choice for esophageal stricture caused by corrosive poisoning?

Accepted Answer

Endoscopy

Answer

Barium meal

Answer

Pharyngoscopy

Answer

X-rays

Question 5

Achalasia cardia is due to which of the following?

Accepted Answer

Degeneration and absence of ganglion cells in Auerbach's Plexus

Answer

Degeneration of myenteric plexus due to toxin

Answer

Excess of ganglion cells in Auerbach's Plexus

Answer

Degeneration of Meissner's Plexus

Question 6

What is the procedure of choice for elective removal of common bile duct stones in most patients?

Accepted Answer

Endoscopic choledocholithotomy

Answer

Open choledocholithotomy

Answer

Laparoscopic choledocholithotomy

Answer

Percutaneous choledocholithotomy

Question 7

Which blood group is associated with gastric cancer?

Accepted Answer

A

Answer

O

Answer

B

Answer

AB

Question 8

Boerhaave's syndrome is due to what?

Accepted Answer

Spontaneous perforation

Answer

Drug-induced esophageal perforation

Answer

Corrosive injury

Answer

Gastroesophageal reflux disease

Question 9

What is true about small bowel diverticula?

Accepted Answer

Contains all the layers of the bowel wall

Answer

Seen in the terminal ileum

Answer

Radiographically not visualized

Answer

Surgical treatment is not required

Question 10

Which artery is most likely to bleed in a duodenal ulcer hemorrhage?

Accepted Answer

Gastroduodenal artery

Answer

Splenic artery

Answer

Left gastric artery

Answer

Superior mesenteric artery

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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