Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 911: A perforated peptic ulcer is treated by all except?

A. Under running of the vessel (Correct Answer)
B. H. pylori eradication
C. Highly selective vagotomy
D. Omental patch

Explanation: **Explanation:** The management of a **perforated peptic ulcer (PPU)** focuses on sealing the perforation and treating the underlying cause. **Why Option A is the Correct Answer (The "Except"):** **Under-running of the vessel** is the surgical technique used to achieve hemostasis in a **bleeding** peptic ulcer (typically involving the gastroduodenal artery in posterior duodenal ulcers). It is not a treatment for perforation. In a perforation, the primary goal is closure of the defect, not vessel ligation. **Analysis of Incorrect Options (Treatments for PPU):** * **Omental Patch (Graham’s Patch):** This is the **gold standard** surgical treatment for a perforated duodenal ulcer. A piece of live omentum is placed over the perforation and secured with sutures. * **H. pylori Eradication:** Since *H. pylori* infection is a leading cause of peptic ulcers, triple therapy (PPI + Clarithromycin + Amoxicillin) is mandatory post-operatively to prevent recurrence. * **Highly Selective Vagotomy (HSV):** While less common in the era of PPIs, HSV (or other definitive acid-reduction surgeries) can be performed concurrently with the patch repair in stable patients with a long history of chronic ulcer disease to reduce acid secretion. **NEET-PG High-Yield Pearls:** * **Investigation of Choice:** Erect X-ray Chest (shows air under the diaphragm in 70-80% of cases). * **Most Common Site of Perforation:** Anterior wall of the first part of the duodenum. * **Most Common Site of Bleeding:** Posterior wall of the first part of the duodenum (Gastroduodenal artery). * **Modified Boey Score:** Used to predict mortality in patients with perforated ulcers.

Question 912: Which of the following is typically true for mesenteric tumors?

A. Usually solid
B. Usually cystic (Correct Answer)
C. Highly malignant
D. Highly vascular

Explanation: **Explanation:** Mesenteric tumors are relatively rare clinical entities, but for the purpose of NEET-PG, it is essential to distinguish between primary mesenteric masses and secondary involvements. **1. Why "Usually Cystic" is correct:** The majority of primary mesenteric tumors are **cystic** rather than solid. The most common type is the **Mesenteric Cyst** (often lymphangiomas or enteric duplication cysts). These are typically benign, slow-growing, and filled with serous or chylous fluid. A classic clinical sign of a mesenteric cyst is its **mobility perpendicular to the line of the mesenteric attachment** (Tillaux’s sign), which distinguishes it from omental or retroperitoneal cysts. **2. Why other options are incorrect:** * **A. Usually solid:** While solid tumors like desmoid tumors, lipomas, or gastrointestinal stromal tumors (GIST) can occur in the mesentery, they are statistically less common than cystic lesions. * **C. Highly malignant:** Most primary mesenteric cysts are benign. Malignant primary mesenteric tumors (like liposarcomas or leiomyosarcomas) are rare. When malignancy is seen in the mesentery, it is more commonly due to secondary deposits (metastasis) from GI or pelvic cancers. * **D. Highly vascular:** Most mesenteric cysts are relatively avascular or have low vascularity. Hypervascularity is more characteristic of specific solid tumors like paragangliomas or certain metastases. **High-Yield Clinical Pearls for NEET-PG:** * **Tillaux’s Sign:** A pathognomonic finding where the mass is mobile horizontally (transversely) but fixed vertically. * **Chylous Cyst:** The most common variety of mesenteric cyst, usually found in the ileal mesentery. * **Treatment of choice:** Complete surgical excision (enucleation). If the blood supply to the adjacent bowel is compromised, bowel resection may be necessary.

Question 913: What is the most common complication of a chronic gastric ulcer?

A. Tea pot stomach
B. Adenocarcinoma
C. Perforation (Correct Answer)
D. Hemorrhage

Explanation: **Explanation:** In the context of **chronic gastric ulcers**, complications are frequent and clinically significant. While hemorrhage is the most common complication of peptic ulcer disease (PUD) *overall* (especially duodenal ulcers), **perforation** is classically cited as the most common serious complication specifically associated with chronic gastric ulcers in many surgical textbooks and NEET-PG patterns. Perforation occurs when the ulcer erodes through the full thickness of the gastric wall, leading to chemical peritonitis. **Analysis of Options:** * **Perforation (Correct):** It is a life-threatening emergency. Gastric ulcers typically perforate into the lesser sac or the peritoneal cavity, presenting with sudden-onset "board-like" abdominal rigidity. * **Hemorrhage:** While extremely common in PUD, it is often the second most common complication for gastric ulcers specifically, or the most common *presentation* of an acute ulcer. * **Tea pot stomach:** This is a late structural sequela of a chronic gastric ulcer. It occurs due to cicatricial contraction of the lesser curvature, pulling the pylorus upward. It is a morphological change rather than the most frequent complication. * **Adenocarcinoma:** While chronic gastric ulcers carry a risk of malignancy (unlike duodenal ulcers), the transformation rate is low (<1%). Most "malignant ulcers" were likely cancers from the outset. **High-Yield Pearls for NEET-PG:** * **Most common site for Gastric Ulcer:** Lesser curvature (Type I). * **Most common site for Perforation:** Anterior wall of the stomach/duodenum. * **Most common site for Bleeding:** Posterior wall (erosion into the Gastroduodenal artery for DU or Left Gastric artery for GU). * **Investigation of Choice for Perforation:** X-ray erect abdomen (showing air under the diaphragm). * **Surgery of Choice for Perforated GU:** Graham’s Omental Patch repair with biopsy of the ulcer edge (to rule out malignancy).

Question 914: Which method is used for the early diagnosis of gastric cancer?

A. Endoscopy
B. Staining of endoscopic biopsy (Correct Answer)
C. Physical examination
D. Ultrasound of the abdomen

Explanation: ### Explanation The early diagnosis of gastric cancer is challenging because early lesions (Early Gastric Cancer - EGC) are often confined to the mucosa or submucosa and may appear as subtle mucosal irregularities, erosions, or discolorations that are easily missed during routine white-light endoscopy. **Why "Staining of endoscopic biopsy" is the correct answer:** While endoscopy is the primary tool for visualization, **chromoendoscopy** (staining) is the gold standard for "early" and precise diagnosis. Vital stains like **Methylene blue, Indigo carmine, or Lugol’s iodine** are applied to the gastric mucosa to highlight architectural abnormalities, delineate tumor margins, and guide targeted biopsies. Histopathological examination (biopsy) remains the definitive diagnostic step, and staining significantly increases the yield and accuracy of these biopsies in detecting early-stage malignancy. **Analysis of Incorrect Options:** * **A. Endoscopy:** While it is the investigation of choice for screening, simple endoscopy without staining or biopsy can miss subtle early lesions. * **C. Physical examination:** Gastric cancer is usually asymptomatic in its early stages. Physical signs like a palpable mass (Virchow’s node, Sister Mary Joseph nodule) indicate advanced, often incurable disease. * **D. Ultrasound of the abdomen:** USG is poor at visualizing hollow viscus organs like the stomach. It is used for staging (detecting liver metastasis or ascites) rather than early diagnosis. **NEET-PG High-Yield Pearls:** * **Investigation of choice for diagnosis:** Upper GI Endoscopy (UGIE) + Biopsy. * **Investigation of choice for staging:** Contrast-Enhanced CT (CECT) of the Abdomen and Pelvis. * **Best tool for T-staging:** Endoscopic Ultrasound (EUS). * **Early Gastric Cancer (EGC):** Defined as carcinoma limited to the mucosa or submucosa, regardless of lymph node status.

Question 915: What is the commonest operation done for gastric outlet obstruction with peptic ulcer?

A. Truncal vagotomy with gastrojejunostomy (Correct Answer)
B. Truncal vagotomy with gastrojejunostomy
C. Highly selective vagotomy with pyloroplasty
D. Gastrojejunostomy

Explanation: **Explanation:** Gastric Outlet Obstruction (GOO) in the context of peptic ulcer disease is typically caused by chronic cicatrization (scarring) and fibrosis of a duodenal ulcer. The surgical management must address two components: the **mechanical obstruction** and the **underlying acid diathesis**. **Why Option A is Correct:** **Truncal Vagotomy with Gastrojejunostomy (TV + GJ)** is the procedure of choice. 1. **Gastrojejunostomy** provides a bypass for the mechanical obstruction, allowing gastric emptying. 2. **Truncal Vagotomy** reduces acid secretion by denervating the parietal cells, thereby treating the underlying ulcer disease and preventing stomal (marginal) ulcers at the site of the anastomosis. **Analysis of Incorrect Options:** * **Highly Selective Vagotomy (HSV) with Pyloroplasty:** While HSV preserves antral motility, it is technically difficult to perform in the presence of the massive scarring and distorted anatomy characteristic of chronic GOO. Furthermore, a pyloroplasty is often impossible to perform on a severely scarred and stenosed duodenum. * **Gastrojejunostomy alone:** Performing a GJ without a vagotomy is inadequate because the high acid environment remains. This leads to a very high risk of **stomal ulceration** (recurrent ulcer at the anastomosis). **NEET-PG High-Yield Pearls:** * **Metabolic Profile:** GOO typically presents with **Hypochloremic, hypokalemic, metabolic alkalosis** with **paradoxical aciduria**. * **Initial Management:** The first step is resuscitation with **0.9% Normal Saline** (to correct chloride and volume) followed by potassium supplementation. * **Investigation of Choice:** Upper GI Endoscopy (after gastric lavage with an Ewald tube to clear retained food). * **Vagotomy Types:** Truncal vagotomy has the highest rate of post-vagotomy diarrhea, while Highly Selective Vagotomy has the lowest.

Question 916: A patient presented with abdominal pain, jaundice, and melena. What is the most likely diagnosis?

A. Hemobilia (Correct Answer)
B. Acute cholangitis
C. Carcinoma gallbladder
D. Acute pancreatitis

Explanation: ### Explanation The correct answer is **Hemobilia**. The patient presents with the classic **Quincke’s Triad**, which consists of: 1. **Biliary Colic (Abdominal pain):** Caused by blood clots obstructing the bile ducts. 2. **Obstructive Jaundice:** Resulting from clot-induced blockage of bile flow. 3. **Gastrointestinal Bleeding (Melena/Hematemesis):** Occurs as blood travels from the biliary tree into the duodenum. Hemobilia most commonly occurs due to **iatrogenic trauma** (e.g., liver biopsy, percutaneous transhepatic cholangiography, or cholecystectomy) or blunt abdominal trauma. #### Why the other options are incorrect: * **Acute Cholangitis:** Characterized by **Charcot’s Triad** (Fever, Jaundice, and RUQ pain). While it shares pain and jaundice, melena is not a feature. * **Carcinoma Gallbladder:** Typically presents with weight loss, anorexia, and persistent RUQ pain. While it can cause jaundice (via Mirizzi syndrome or direct invasion), significant GI bleeding (melena) is rare. * **Acute Pancreatitis:** Presents with severe epigastric pain radiating to the back and vomiting. Jaundice may occur if there is common bile duct compression, but melena is not a primary symptom unless there is a complication like a pseudoaneurysm rupture. #### NEET-PG High-Yield Pearls: * **Most common cause of Hemobilia:** Iatrogenic trauma (Liver biopsy/instrumentation). * **Investigation of choice:** Selective Hepatic Angiography (both diagnostic and therapeutic). * **Management:** Most cases are minor and resolve with conservative care; however, persistent bleeding is managed via **Arterial Embolization**. * **Differentiate:** Do not confuse Quincke’s Triad (Hemobilia) with Charcot’s Triad (Cholangitis) or Saint’s Triad (Hiatus hernia, Gallstones, Diverticulosis).

Question 917: What is the commonest stomach tumor that bleeds?

A. Adenocarcinoma
B. Squamous carcinoma
C. Leiomyosarcoma (Correct Answer)
D. Fibrosarcoma

Explanation: **Explanation:** The correct answer is **Leiomyosarcoma** (often categorized under the broader umbrella of Gastrointestinal Stromal Tumors or GISTs in modern pathology). **Why Leiomyosarcoma is correct:** While Adenocarcinoma is the most common overall malignancy of the stomach, **Leiomyosarcoma** (and GISTs) is classically associated with **intraluminal bleeding** as its most frequent presenting symptom. These tumors arise from the intramural layers of the stomach. As they grow, they cause pressure necrosis of the overlying mucosa, leading to a characteristic **central ulceration** (often described as a "umbilicated" or "target" lesion on imaging). This deep ulceration frequently erodes into intramural vessels, causing significant hematemesis or melena. **Why the other options are incorrect:** * **Adenocarcinoma:** This is the most common stomach cancer overall. While it can cause chronic occult blood loss leading to iron deficiency anemia, it is less likely than a mesenchymal tumor to present with acute, massive bleeding as the primary symptom. * **Squamous carcinoma:** This is extremely rare in the stomach (usually occurring at the gastroesophageal junction as an extension of esophageal cancer) and is not the classic answer for a bleeding gastric tumor. * **Fibrosarcoma:** This is an exceptionally rare mesenchymal tumor of the stomach and is not a standard clinical consideration for gastric bleeding. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for GIST/Leiomyosarcoma:** Stomach (60-70%). * **Endoscopic appearance:** A smooth, subepithelial mass with a central "puncate" ulcer or "volcano" sign. * **Treatment of choice:** Surgical resection with clear margins (lymphadenectomy is usually not required as they spread hematogenously, not via lymphatics). * **Rule of Thumb:** If a question asks for the "most common tumor," it is usually Adenocarcinoma. If it asks for the "most common tumor that **bleeds**," think Leiomyosarcoma/GIST.

Question 918: A patient with carcinoma of the lower third of the esophagus receives chemoradiotherapy and shows complete response in dysphagia. What is the next step in management?

A. Reassure
B. Follow with CT scan every 6 months
C. Esophagectomy (Correct Answer)
D. Endoscopic ultrasound to look for residual disease

Explanation: **Explanation:** The management of esophageal carcinoma depends on the stage and location. For resectable carcinoma of the lower third of the esophagus (typically adenocarcinoma or squamous cell carcinoma), the standard of care is **Neoadjuvant Chemoradiotherapy (nCRT)** followed by **Surgery (Esophagectomy)**. **Why Esophagectomy is the correct answer:** Even if a patient shows a "complete clinical response" (disappearance of dysphagia and negative imaging), it does not equate to a "pathological complete response." Microscopic residual disease is frequently present in the esophageal wall or regional lymph nodes. Studies (like the CROSS trial) demonstrate that surgical resection after nCRT significantly improves long-term survival and reduces the risk of local recurrence compared to non-surgical management. **Why other options are incorrect:** * **A & B (Reassure/Follow-up):** Esophageal cancer has a high propensity for local recurrence and systemic spread. Observation alone is considered "definitive CRT," which is generally reserved for patients who are medically unfit for surgery or have cervical esophageal cancer. * **D (Endoscopic Ultrasound):** While EUS is excellent for initial staging, it is unreliable for assessing response after radiotherapy due to radiation-induced fibrosis and inflammation, which can mimic residual tumor (high false-positive rate). **Clinical Pearls for NEET-PG:** * **Standard Procedure:** For lower-third lesions, **Ivor-Lewis Esophagectomy** (laparotomy + right thoracotomy) is the most common approach. * **Gold Standard:** Surgery remains the mainstay for resectable T2-T4a tumors. * **Cervical Esophagus:** Unlike the lower third, the treatment of choice for carcinoma of the **cervical esophagus** is definitive Chemoradiotherapy, as surgery is highly morbid (requires laryngopharyngectomy).

Question 919: Which of the following features are TRUE about Pyloric stenosis?

A. Hypokalemic alkalosis, visible peristalsis from right to left, and carcinoma of the stomach are true, while retention vomiting and female predilection are false.
B. Hypokalemic alkalosis, visible peristalsis from right to left, and female predilection are true, while carcinoma of the stomach and retention vomiting are false.
C. Hypokalemic alkalosis is true, while visible peristalsis from right to left, carcinoma of the stomach, retention vomiting, and female predilection are false. (Correct Answer)
D. All of the listed features are true.

Explanation: In **Infantile Hypertrophic Pyloric Stenosis (IHPS)**, the hypertrophy of the pyloric sphincter leads to gastric outlet obstruction. This results in persistent vomiting of gastric contents (hydrochloric acid), leading to a classic metabolic derangement: **Hypochloremic, hypokalemic, metabolic alkalosis** with paradoxical aciduria. This makes the statement regarding hypokalemic alkalosis correct. **Analysis of other features:** * **Visible Peristalsis:** In IHPS, peristalsis moves from the **left to right** (hypochondrium to the epigastrium) as the stomach attempts to force contents through the narrowed pylorus. * **Gender Predilection:** There is a strong **male predilection** (ratio 4:1), particularly affecting first-born males. * **Retention Vomiting:** While vomiting is projectile and non-bilious, the term "retention vomiting" is more classically associated with adult gastric outlet obstruction (e.g., due to malignancy or cicatrizing ulcers). * **Carcinoma of the Stomach:** IHPS is a benign congenital hypertrophic condition and is **not** a premalignant state for gastric carcinoma. **Why Option C is correct:** It accurately identifies hypokalemic alkalosis as the only true feature among the list provided, correctly debunking the direction of peristalsis, gender bias, and disease associations. **High-Yield NEET-PG Pearls:** * **Clinical Sign:** "Olive-shaped" mass palpable in the epigastrium. * **Diagnosis:** Ultrasound is the investigation of choice (Pyloric thickness >4mm, length >14mm). * **Barium Swallow:** Shows the "String sign," "Beak sign," or "Shoulder sign." * **Management:** Initial resuscitation with **0.45% or 0.9% Normal Saline** (to correct alkalosis) followed by **Ramstedt’s Pyloromyotomy**.

Question 920: Boerhaave syndrome involves perforation of the esophagus after which of the following actions?

A. Burns
B. Acid ingestion
C. Stress
D. Vomiting (Correct Answer)

Explanation: **Explanation:** **Boerhaave syndrome** is a spontaneous transmural perforation of the esophagus. It is caused by a sudden, massive increase in intra-esophageal pressure combined with negative intrathoracic pressure. 1. **Why Vomiting is Correct:** The classic mechanism involves forceful vomiting or retching against a closed glottis (the **Mackler triad**: vomiting, chest pain, and subcutaneous emphysema). The sudden rise in pressure typically causes a longitudinal tear in the **left posterolateral aspect of the distal esophagus**, approximately 2–3 cm above the gastroesophageal junction, which is the anatomically weakest point. 2. **Why Other Options are Incorrect:** * **Burns & Acid Ingestion:** These cause chemical esophagitis, strictures, or immediate liquefactive/coagulative necrosis. While they can lead to perforation, it is due to tissue erosion rather than the barogenic (pressure-related) mechanism defining Boerhaave. * **Stress:** While "Stress ulcers" (Curling’s or Cushing’s) can cause gastric or duodenal perforations, they do not cause spontaneous esophageal rupture. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The gold standard initial investigation is a **Gastrografin (water-soluble) swallow**, which shows extravasation of contrast. * **Chest X-ray:** May show pneumomediastinum, left-sided pleural effusion, or the **V-sign of Naclerio** (air behind the heart). * **Distinction:** Unlike **Mallory-Weiss syndrome** (which involves only a mucosal/submucosal tear and presents with hematemesis), Boerhaave syndrome is **transmural** and is a surgical emergency with high mortality. * **Management:** Requires immediate resuscitation, IV antibiotics, and usually surgical repair (primary closure and mediastinal drainage) if diagnosed within 24 hours.

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