Gastrointestinal Surgery Practice Questions

Q: Oesophageal manometry is used in the diagnosis of which of the following conditions?

Achalasia cardia. **Explanation:** **Achalasia Cardia (Correct Answer):** Oesophageal manometry is the **gold standard investigation** for diagnosing Achalasia Cardia. It measures the pressure and coordination of esophageal muscle contractions. In Achalasia, manometry typically reveals a classic triad: 1. **Incomplete relaxation of the Lower Esophageal Sphincter (LES)** upon swallowing (residual pressure >8 mmHg). 2. **Aperistalsis** in the distal two-thirds of the esophagus. 3. **Elevated resting LES pressure** (hypertensive LES >45 mmHg). Modern High-Resolution Manometry (HRM) further classifies Achalasia into three types (Chicago Classification), which guides prognosis and treatment. **Why other options are incorrect:** * **A. Cancer Esophagus:** Diagnosis is primarily made via **Upper GI Endoscopy (UGIE) and biopsy**. Imaging (CT/PET) is used for staging. Manometry has no role in diagnosing malignancy. * **B. Barrett Esophagus:** This is a histological diagnosis (metaplasia) requiring **Endoscopy and biopsy** to identify specialized columnar epithelium. * **C. Schatzki Ring:** This is a structural/mechanical narrowing at the squamocolumnar junction. It is best diagnosed using a **Barium Swallow** (showing a thin, diaphragm-like ring) or Endoscopy. **High-Yield Clinical Pearls for NEET-PG:** * **Bird’s Beak Appearance:** Classic finding on Barium Swallow for Achalasia. * **Heller’s Myotomy:** The surgical treatment of choice (often combined with a partial fundoplication). * **Nutcracker Esophagus:** Characterized by high-amplitude peristaltic contractions (>180 mmHg) on manometry. * **Diffuse Esophageal Spasm (DES):** Shows "corkscrew esophagus" on barium swallow and uncoordinated "simultaneous" contractions on manometry.

Q: What is the most desirable structure to anastomose with the esophagus?

Stomach. **Explanation:** In esophageal reconstruction (following esophagectomy for malignancy or corrosive injury), the **Stomach (Option A)** is the most desirable organ for anastomosis. This is primarily due to its **excellent intrinsic blood supply** (based on the right gastric and right gastro-epiploic arteries), its **natural proximity** to the esophagus, and the fact that it requires only a **single anastomosis** (esophagogastrostomy). The stomach is highly distensible, allowing it to reach as high as the neck without excessive tension, which is crucial for preventing anastomotic leaks. **Why other options are less desirable:** * **Jejunum (Option B):** While used in "Roux-en-Y" reconstructions or as a free graft, the jejunum has a complex mesenteric vascular anatomy that makes it difficult to mobilize to the neck. It is usually the second choice if the stomach is unavailable. * **Colon (Option C):** Colonic interposition (using the left or right colon) is a major procedure with higher morbidity. It requires three anastomoses and is typically reserved as a third-line option when the stomach is diseased or previously operated upon. * **Duodenum (Option D):** The duodenum is retroperitoneal and fixed; it lacks the length and mobility required to reach the mediastinum or neck for an esophageal anastomosis. **Clinical Pearls for NEET-PG:** * **Gastric Pull-up:** The most common procedure for esophageal replacement. * **Vascularity:** The mobilized stomach survives on the **Right Gastro-epiploic artery**, which becomes the primary blood supply for the conduit. * **Route of Choice:** The **posterior mediastinum** (the original esophageal bed) is the shortest and most physiological route for the gastric conduit.

Q: What is the most common site of gastrointestinal stromal tumors (GIST)?

Stomach. **Explanation:** Gastrointestinal Stromal Tumors (GISTs) are the most common mesenchymal neoplasms of the gastrointestinal tract, originating from the **Interstitial Cells of Cajal (ICC)**—the "pacemaker" cells of the gut. **1. Why Stomach is Correct:** The **stomach** is the most frequent site, accounting for approximately **60%** of all GIST cases. These tumors typically present as submucosal masses and are most commonly found in the gastric body. **2. Analysis of Incorrect Options:** * **Small Intestine:** This is the second most common site, accounting for about **25–30%** of cases (most frequently in the duodenum). While common, it remains significantly less frequent than the stomach. * **Large Intestine:** Colorectal GISTs are relatively rare, representing only about **5%** of cases. * **Spleen:** GISTs are tumors of the GI tract wall. The spleen is a lymphoid organ and is not a primary site for GISTs. Extra-gastrointestinal stromal tumors (EGISTs) can occur in the omentum or mesentery, but rarely involve the spleen. **3. High-Yield Clinical Pearls for NEET-PG:** * **Molecular Marker:** Most GISTs (95%) express **CD117 (c-KIT)**, a tyrosine kinase receptor. **DOG1** is another highly sensitive marker. * **Genetics:** Most cases involve mutations in the *c-KIT* gene; a subset involves the *PDGFRA* gene. * **Treatment:** The gold standard for localized GIST is **surgical resection** with negative margins (lymphadenectomy is usually not required). * **Targeted Therapy:** **Imatinib mesylate** (a tyrosine kinase inhibitor) is the first-line treatment for metastatic, unresectable, or recurrent GIST. * **Rule of 10s:** Roughly 10-30% of GISTs are clinically malignant. Size (>5 cm) and mitotic index (>5/50 HPF) are the best predictors of malignant potential.

Q: Which of the following is NOT an indication for prophylactic cholecystectomy?

Diabetes mellitus. **Explanation:** Asymptomatic gallstones generally do not require surgery, as the risk of complications is lower than the risk of surgery. However, certain conditions warrant **prophylactic cholecystectomy** due to a significantly increased risk of gallbladder carcinoma or severe complications. **1. Why Diabetes Mellitus is the Correct Answer:** In the past, diabetes was considered an indication for prophylactic cholecystectomy due to fears of rapidly progressing gangrenous cholecystitis. However, modern evidence shows that diabetics do not have a higher risk of developing complications compared to non-diabetics. Therefore, **asymptomatic gallstones in a diabetic patient are managed expectantly**, just like in the general population. **2. Why the other options are wrong (Indications for Surgery):** * **Hemoglobinopathy (e.g., Sickle Cell Anemia, Hereditary Spherocytosis):** These patients have a high rate of pigment stone formation. Prophylactic surgery is recommended to avoid "diagnostic confusion" between a hemolytic crisis and acute cholecystitis. * **Gallstone size >3 cm:** Large stones are associated with a significantly higher risk of **gallbladder carcinoma** due to chronic mucosal irritation. * **Porcelain Gallbladder:** This refers to intramural calcification of the gallbladder wall. It is traditionally associated with a high risk (up to 25%) of gallbladder malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Other indications for prophylactic cholecystectomy:** Anomalous pancreaticobiliary ductal union (APBDU), adenomatous gallbladder polyps (>1 cm), and "Ship-to-shore" (patients in remote areas with no access to surgical care). * **Bariatric Surgery:** Patients undergoing bariatric procedures with asymptomatic stones should have a cholecystectomy concurrently. * **Mirizzi Syndrome:** A rare complication where a stone in the cystic duct compresses the common hepatic duct, often requiring surgical intervention.

Q: All of the following are risk factors for carcinoma of the gallbladder except?

Multiple 2 cm gallstones. **Explanation:** Gallbladder carcinoma (GBC) is the most common biliary tract malignancy, often associated with chronic inflammation. **Why "Multiple 2 cm gallstones" is the correct answer:** While cholelithiasis is the most common risk factor for GBC, the risk is directly proportional to the **size** of the stone, not necessarily the number. Stones **larger than 3 cm** increase the risk of malignancy by 10-fold compared to smaller stones. Multiple stones totaling a large volume do not carry the same specific risk as a single large stone (>3 cm). **Analysis of Incorrect Options:** * **Primary Sclerosing Cholangitis (PSC):** PSC causes chronic inflammation of the entire biliary tree. Patients with PSC have a significantly higher risk of both cholangiocarcinoma and gallbladder cancer. * **Porcelain Gallbladder:** This refers to intramural calcification of the gallbladder wall. Historically cited as having a very high risk (25%), recent studies suggest a lower but still significant risk (approx. 7-15%), necessitating prophylactic cholecystectomy. * **Choledochal Cyst:** Congenital cystic dilatations of the biliary tree (especially Type I and IV) are associated with an anomalous pancreaticobiliary ductal junction (APBDJ). This allows reflux of pancreatic enzymes, causing chronic mucosal damage and a high predisposition to malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Most common risk factor:** Cholelithiasis (present in 70-90% of cases). * **Size Threshold:** Stones **>3 cm** are a definitive indication for prophylactic cholecystectomy even if asymptomatic. * **Anomalous Pancreaticobiliary Ductal Junction (APBDJ):** A major risk factor even in the absence of stones. * **Gallbladder Polyps:** Polyps **>10 mm**, sessile morphology, or those associated with stones are high-risk features for GBC. * **Salmonella typhi:** Chronic carriers have an increased risk of GBC due to chronic biliary infection.

Q: What is the investigation of choice for appendicitis in adults?

CT Scan. **Explanation:** The diagnosis of acute appendicitis is primarily clinical; however, when imaging is required to confirm the diagnosis or rule out differentials in adults, **Contrast-Enhanced Computed Tomography (CECT) of the abdomen and pelvis** is the investigation of choice. **1. Why CT Scan is the Correct Answer:** CT scan has a high sensitivity (>94%) and specificity (>95%) for appendicitis. In adults, it is superior to other modalities because it can clearly visualize the appendix (diameter >6mm), periappendiceal fat stranding, and potential complications like phlegmon or abscess. It is also highly effective at identifying alternative causes of acute abdominal pain. **2. Why Other Options are Incorrect:** * **USG (Ultrasound):** While often the first-line investigation in **children and pregnant women** to avoid radiation, it is operator-dependent and limited by body habitus (obesity) or overlying bowel gas in adults. * **Serum ESR:** This is a non-specific inflammatory marker. While it may be elevated, it cannot localize the pathology to the appendix and is not diagnostic. * **MRI Abdomen:** While highly accurate, it is expensive, time-consuming, and not readily available in emergency settings. It is typically reserved for pregnant patients when USG is inconclusive. **Clinical Pearls for NEET-PG:** * **Gold Standard/IOC:** CT Scan (specifically CECT). * **First-line in Pregnancy/Children:** Ultrasound. * **Most common sign on CT:** Appendiceal diameter >6 mm with wall thickening. * **Alvarado Score:** A clinical scoring system (MANTRELS) where a score of ≥7 usually indicates a need for surgery. * **Appendicular Artery:** A branch of the ileocolic artery (derived from the Superior Mesenteric Artery), which is an end-artery, making the appendix prone to gangrene.

Q: What is the most common cause of acute intestinal obstruction?

Adhesions. **Explanation:** **1. Why Adhesions are Correct:** Postoperative **peritoneal adhesions** are the leading cause of acute intestinal obstruction worldwide, accounting for approximately **60–70%** of all cases of small bowel obstruction (SBO). They develop as a result of peritoneal injury during surgery, leading to fibrin deposition and fibrous band formation that can kink or compress the bowel. In patients with a history of abdominal surgery, adhesions are the presumed cause until proven otherwise. **2. Analysis of Incorrect Options:** * **Inguinal Hernias:** Historically, obstructed hernias were the most common cause. However, with the rise in elective surgical procedures, adhesions have overtaken them. Hernias remain the most common cause in patients with a **virgin abdomen** (no previous surgery) and the most common cause of strangulated obstruction. * **Volvulus:** This is a common cause of large bowel obstruction (specifically Sigmoid Volvulus), particularly in certain geographical regions (the "Volvulus Belt"), but it is not the most common cause of general intestinal obstruction. * **Internal Hernias:** These occur when the bowel protrudes through a mesenteric defect or a physiological opening (e.g., Foramen of Winslow). While clinically significant, they are rare compared to adhesions. **3. NEET-PG High-Yield Pearls:** * **Most common cause of SBO:** Adhesions. * **Most common cause of LBO:** Malignancy (Colorectal Cancer). * **Most common cause of obstruction in children:** Intussusception. * **Most common cause of obstruction in a virgin abdomen:** Hernia. * **Cardinal features of obstruction:** Pain, vomiting, distension, and absolute constipation (obstipation). * **X-ray finding:** Multiple air-fluid levels (Step-ladder pattern) is characteristic of SBO.

Q: Intermittent dysphagia is caused by which of the following conditions?

Achalasia cardiae. **Explanation:** Dysphagia (difficulty swallowing) is clinically categorized based on its progression and the type of food involved. **Achalasia Cardiae** is characterized by **intermittent dysphagia** that is paradoxically more pronounced for liquids than for solids in its early stages. This occurs due to the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of peristalsis. The intermittent nature is often triggered by emotional stress or rapid eating. **Analysis of Options:** * **Achalasia Cardiae (Correct):** The classic presentation is intermittent dysphagia, often long-standing, associated with regurgitation of undigested food and weight loss. * **Diffuse Esophageal Spasm (DES):** While DES also causes intermittent dysphagia, it is characteristically associated with **severe retrosternal chest pain** (mimicking angina). In many clinical classifications, Achalasia is the preferred answer for "intermittent" unless "chest pain" is the dominant feature. * **Stricture & Reflux Esophagitis:** These represent **progressive dysphagia**. In benign strictures or esophageal cancer, the difficulty starts with solids and gradually progresses to liquids as the lumen narrows. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Esophageal Manometry (shows incomplete LES relaxation and aperistalsis). * **Barium Swallow Sign:** "Bird’s Beak" or "Rat-tail" appearance. * **Heller’s Myotomy:** The surgical treatment of choice (usually performed with a Dor/Toupet fundoplication). * **Rule of Thumb:** Progressive dysphagia = Organic/Mechanical obstruction (Cancer/Stricture); Intermittent/Paradoxical dysphagia = Motility disorder (Achalasia/DES).

Question 1

Oesophageal manometry is used in the diagnosis of which of the following conditions?

Accepted Answer

Achalasia cardia

Answer

Cancer esophagus

Answer

Barrett esophagus

Answer

Schatzki ring

Question 2

What is the most desirable structure to anastomose with the esophagus?

Accepted Answer

Stomach

Answer

Jejunum

Answer

Colon

Answer

Duodenum

Question 3

What is the most common site of gastrointestinal stromal tumors (GIST)?

Accepted Answer

Stomach

Answer

Small intestine

Answer

Large intestine

Answer

Spleen

Question 4

An adult presented with hematemesis and upper abdominal pain. Endoscopy revealed a growth at the pyloric antrum of the stomach. CT scan showed growth involving the pyloric antrum without infiltration or invasion into surrounding structures and no evidence of distant metastasis. At laparotomy, neoplastic growth was observed to involve the posterior wall of the stomach and the pancreas, extending 6 cm up to the tail of the pancreas. What is the most appropriate surgical management?

Accepted Answer

Partial gastrectomy and distal pancreatectomy

Answer

Closure of the abdomen

Answer

Antrectomy and vagotomy

Answer

Partial gastrectomy, distal pancreatectomy, and splenectomy

Question 5

Which of the following is NOT an indication for prophylactic cholecystectomy?

Accepted Answer

Diabetes mellitus

Answer

Hemoglobinopathy

Answer

Gallstone size greater than 3 cm

Answer

Porcelain gallbladder

Question 6

All of the following are risk factors for carcinoma of the gallbladder except?

Accepted Answer

Multiple 2 cm gallstones

Answer

Primary sclerosing cholangitis

Answer

Porcelain gallbladder

Answer

Choledochal cyst

Question 7

What is the investigation of choice for appendicitis in adults?

Accepted Answer

CT Scan

Answer

USG

Answer

Serum ESR

Answer

MRI Abdomen

Question 8

What is the most common cause of acute intestinal obstruction?

Accepted Answer

Adhesions

Answer

Volvulus

Answer

Inguinal hernias

Answer

Internal hernias

Question 9

In achalasia cardia, what is true?

Accepted Answer

Pressure at the distal esophagus is increased with absent peristalsis.

Answer

Low pressure at the lower esophageal sphincter with absent peristalsis.

Answer

Pressure greater than 50 mmHg with peristalsis.

Answer

Pressure at the distal esophagus is increased with normal relaxation.

Question 10

Intermittent dysphagia is caused by which of the following conditions?

Accepted Answer

Achalasia cardiae

Answer

Stricture

Answer

Reflux esophagitis

Answer

Diffuse esophageal spasm

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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