Gastrointestinal Surgery Practice Questions

Q: What percentage of patients with a perforated peptic ulcer show free gas under the diaphragm?

75%. **Explanation:** The presence of pneumoperitoneum (free gas under the diaphragm) is a hallmark sign of a hollow viscus perforation. In the case of a **perforated peptic ulcer (PPU)**, free gas is visualized on an erect chest X-ray in approximately **75% of cases**. **Why 75% is correct:** The absence of air in the remaining 25% of patients occurs because the perforation may be "sealed" by the omentum (Graham’s patch effect), the gallbladder, or the liver. Additionally, if the stomach is empty at the time of perforation or if the site is located posteriorly into the lesser sac, gas may not reach the subdiaphragmatic space. **Analysis of Incorrect Options:** * **A (100%) & D (90%):** These are overestimates. While X-ray is the first-line investigation, its sensitivity is not high enough to detect gas in every patient, especially if the volume of leaked air is less than 1–2 ml. * **C (50%):** This is an underestimate. While some older studies suggested lower rates, modern clinical consensus and standard textbooks (like Bailey & Love) cite the 70–80% range. **High-Yield Clinical Pearls for NEET-PG:** * **Best Initial Investigation:** Erect Chest X-ray (it is more sensitive than an abdominal X-ray for detecting small amounts of free air). * **Most Sensitive Investigation:** Non-contrast CT (NCCT) of the abdomen (can detect >95% of perforations). * **Positioning:** If the patient cannot stand, a **left lateral decubitus** X-ray is performed; air will be seen over the liver shadow. * **Clinical Sign:** Loss of liver dullness on percussion (Jobert's sign) is a classic physical finding of pneumoperitoneum.

Q: A 23-year-old woman with a history of an eating disorder complains of vomiting, nausea, and severe abdominal pain. Physical examination shows abdominal distension and constipation. An X-ray film of the abdomen reveals air-fluid levels and a hyperlucent shadow at the epigastric area. The material obstructing the gastrointestinal tract is removed surgically and shown. Which of the following is the most likely diagnosis?

Trichobezoar. ***Trichobezoar*** - Young women with **eating disorders** are at high risk for trichobezoars due to **trichotillomania** and **trichophagia** (hair pulling and eating behaviors). - The **hyperlucent shadow** at the epigastric area on X-ray is characteristic of a **hair mass**, which appears less dense than other gastric contents. *Diverticulum of the stomach* - **Gastric diverticula** are rare and typically **asymptomatic**, not causing complete gastric outlet obstruction. - They appear as **outpouchings** on imaging, not as intraluminal obstructing masses with air-fluid levels. *Gastric lymphoma* - Presents with **weight loss**, **night sweats**, and **lymphadenopathy**, which are not described in this case. - Would appear as a **solid mass** on imaging, not as a hyperlucent shadow, and wouldn't cause mechanical obstruction. *Phytobezoar* - Composed of **indigestible plant material** and more common in patients with **previous gastric surgery** or **gastroparesis**. - Typically appears **denser** on X-ray compared to the hyperlucent appearance described, and less associated with eating disorders.

Q: Charcot's triad includes all EXCEPT:

Cholangitis. **Explanation:** The question asks for the components of **Charcot’s Triad**, a classic clinical sign used to diagnose **Acute Cholangitis** (inflammation/infection of the bile duct). **1. Understanding Charcot’s Triad:** Charcot’s Triad consists of three specific clinical findings: * **Fever** (usually with chills and rigors) * **Jaundice** * **Right Upper Quadrant (RUQ) Pain** The correct answer is **Cholangitis** because the triad is the diagnostic hallmark of this condition. The presence of these three symptoms indicates an obstructed biliary system with a superimposed infection. **2. Analysis of Options:** * **Gallstones (A):** While gallstones (choledocholithiasis) are the most common *cause* of the obstruction leading to cholangitis, they are not a "component" of the triad itself. * **Diverticulosis (C) & Hiatal Hernia (D):** These are unrelated gastrointestinal conditions. Diverticulosis involves outpocketings of the colonic wall, and a hiatal hernia involves the stomach protruding through the diaphragm. Neither presents with the triad of fever, jaundice, and RUQ pain. **3. High-Yield Clinical Pearls for NEET-PG:** * **Reynold’s Pentad:** If a patient with Charcot’s Triad also develops **Altered Mental Status** and **Hypotension (Shock)**, it is known as Reynold’s Pentad, indicating severe, life-threatening suppurative cholangitis. * **Tokyo Guidelines (TG18):** Modern diagnosis of cholangitis relies on the Tokyo Guidelines, which incorporate systemic inflammation, cholestasis, and imaging evidence of biliary obstruction. * **Management:** The definitive treatment for acute cholangitis is biliary decompression, most commonly via **ERCP (Endoscopic Retrograde Cholangiopancreatography)**.

Q: Heller's operation is indicated for which of the following conditions?

Achalasia. **Explanation:** **1. Why Achalasia is Correct:** Heller’s operation (specifically **Heller’s Myotomy**) is the surgical gold standard for **Achalasia Cardia**. The underlying pathology in Achalasia is the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of esophageal peristalsis due to the loss of myenteric (Auerbach’s) plexus. Heller’s Myotomy involves cutting the longitudinal and circular muscle fibers of the distal esophagus and the proximal stomach (cardia) to reduce the resting pressure of the LES, thereby relieving the functional obstruction. **2. Why Other Options are Incorrect:** * **Gastric Cancer:** Treatment typically involves gastrectomy (subtotal or total) with lymphadenectomy (D2 dissection). * **Esophageal Cancer:** Management usually requires esophagectomy (e.g., McKeown or Ivor Lewis procedure) combined with chemoradiotherapy. * **Hiatal Hernia:** Small hernias are managed medically; large or symptomatic hernias require **Cruroplasty** (repair of the diaphragmatic hiatus) and an anti-reflux procedure (Fundoplication). **3. NEET-PG High-Yield Clinical Pearls:** * **Modified Heller’s Myotomy:** Today, it is almost always performed laparoscopically and combined with an **anti-reflux procedure** (like **Dor** or **Toupet fundoplication**) to prevent postoperative GERD. * **Bird’s Beak Appearance:** The classic radiographic finding on Barium Swallow for Achalasia. * **Manometry:** The **gold standard diagnostic investigation** for Achalasia, showing incomplete LES relaxation (IRP >15 mmHg) and aperistalsis. * **POEM (Per-Oral Endoscopic Myotomy):** A newer, minimally invasive endoscopic alternative to Heller’s Myotomy.

Q: Most common type of malignancy of the stomach is:

Adenocarcinoma. **Explanation:** **Adenocarcinoma** is the most common histological type of gastric malignancy, accounting for approximately **90–95%** of all stomach cancers. It originates from the mucus-producing glandular cells of the gastric mucosa. According to the Lauren classification, it is further divided into two main types: **Intestinal** (associated with environmental factors and H. pylori) and **Diffuse** (associated with genetic factors like E-cadherin mutations and a poorer prognosis). **Analysis of Incorrect Options:** * **Squamous Cell Carcinoma:** Extremely rare in the stomach. While it is the most common type in the upper and middle esophagus, the stomach lacks native squamous epithelium unless there is heterotopic mucosa or extension from the esophagus. * **Anaplastic Carcinoma:** A rare, highly aggressive undifferentiated variant of gastric cancer with a very poor prognosis, representing a negligible percentage of cases. * **Lymphoma:** The stomach is the most common site for extranodal lymphomas (primarily MALToma and DLBCL), but they only account for about **1–5%** of all gastric malignancies. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** The **Antrum** (lesser curvature) is the most common location for gastric cancer. * **Risk Factors:** *H. pylori* infection (most important), smoking, salted/smoked foods (nitrosamines), and Blood Group A. * **Virchow’s Node:** Left supraclavicular lymphadenopathy indicating metastasis. * **Sister Mary Joseph Nodule:** Periumbilical metastasis. * **Krukenberg Tumor:** Metastasis to the ovaries (classically showing signet ring cells). * **Investigation of Choice:** Upper GI Endoscopy with biopsy.

Q: Where does a posterior perforation of a peptic ulcer typically drain?

Omental bursa. **Explanation:** The stomach is anatomically divided into anterior and posterior surfaces. The **omental bursa (lesser sac)** lies directly behind the stomach, separated from the pancreas and other retroperitoneal structures. 1. **Why Option A is correct:** When a peptic ulcer (typically a gastric ulcer on the posterior wall) perforates, the leaked gastric contents are anatomically confined by the boundaries of the lesser sac. This often leads to the formation of a **lesser sac abscess**. Because this space is contained, posterior perforations may present more insidiously compared to the dramatic "board-like rigidity" seen in anterior perforations. 2. **Why other options are incorrect:** * **Greater Sac:** This is the main peritoneal cavity. Anterior wall ulcers perforate into the greater sac, causing generalized peritonitis. * **Foramen of Winslow:** This is the communication between the greater and lesser sacs. While fluid can theoretically pass through here, it is a narrow opening; gravity and anatomical positioning usually keep posterior leaks localized to the omental bursa. * **Paracolic Gutter:** These are peritoneal recesses lateral to the ascending and descending colon. They typically drain fluid from the gallbladder or appendix (right) or are sites for fluid collection in generalized peritonitis, but they are not the primary drainage site for posterior gastric leaks. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of perforation:** Anterior wall of the duodenum (First part). * **Most common site of bleeding:** Posterior wall of the duodenum (due to erosion of the **Gastroduodenal artery**). * **Posterior Gastric Ulcers:** Can erode into the **Pancreas**, leading to referred pain in the back. * **X-ray finding:** "Gas under the diaphragm" is classic for anterior perforations but may be absent in posterior perforations if the gas is trapped in the lesser sac.

Question 1

Which of the following factors is responsible for causing diarrhea after vagotomy?

Accepted Answer

None of the above

Answer

Rapid gastric emptying

Answer

Hypoacidity in the duodenum

Answer

Irregular peristalsis

Question 2

What percentage of patients with a perforated peptic ulcer show free gas under the diaphragm?

Accepted Answer

75%

Answer

100%

Answer

50%

Answer

90%

Question 3

A 23-year-old woman with a history of an eating disorder complains of vomiting, nausea, and severe abdominal pain. Physical examination shows abdominal distension and constipation. An X-ray film of the abdomen reveals air-fluid levels and a hyperlucent shadow at the epigastric area. The material obstructing the gastrointestinal tract is removed surgically and shown. Which of the following is the most likely diagnosis?

Accepted Answer

Trichobezoar

Answer

Diverticulum of the stomach

Answer

Gastric lymphoma

Answer

Phytobezoar

Question 4

Which of the following nutritional consequences is possible following peptic ulcer surgeries other than vagotomy?

Accepted Answer

Folic acid deficiency

Answer

Iron deficiency

Answer

Weight loss

Answer

Vitamin B12 deficiency

Question 5

Charcot's triad includes all EXCEPT:

Accepted Answer

Cholangitis

Answer

Gallstones

Answer

Diverticulosis

Answer

Hiatal hernia

Question 6

A 35-year-old woman presents to the emergency department with abdominal pain and bilious vomiting, but no bowel distension. Abdominal X-ray shows no air-fluid levels. What is the most likely diagnosis?

Accepted Answer

Duodenal obstruction

Answer

Carcinoma of the rectum

Answer

Adynamic ileus

Answer

Pseudo-obstruction

Question 7

Heller's operation is indicated for which of the following conditions?

Accepted Answer

Achalasia

Answer

Gastric cancer

Answer

Esophageal cancer

Answer

Hiatal hernia

Question 8

Most common type of malignancy of the stomach is:

Accepted Answer

Adenocarcinoma

Answer

Squamous carcinoma

Answer

Anaplastic carcinoma

Answer

Lymphoma

Question 9

Where does a posterior perforation of a peptic ulcer typically drain?

Accepted Answer

Omental bursa

Answer

Greater sac

Answer

Foramen of Winslow

Answer

Paracolic gutter

Question 10

What is the management of appendicular mass/abscess?

Accepted Answer

Antibiotics and appendectomy 6 weeks later

Answer

Antibiotics only

Answer

Immediate appendectomy

Answer

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Gastrointestinal Surgery — MCQs

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