Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 321: A 25-year-old man presents with recurrent, indolent fistula in ano. He also reports weight loss, recurrent episodes of diarrhea with blood in the stool, and tenesmus. Proctoscopy reveals a healthy, normal-appearing rectum. What is the most likely diagnosis?

A. Crohn's colitis (Correct Answer)
B. Ulcerative colitis
C. Amoebic colitis
D. Ischemic colitis

Explanation: ### Explanation The clinical presentation of a young patient with **recurrent, indolent fistula-in-ano** associated with systemic symptoms (weight loss) and gastrointestinal distress (bloody diarrhea) strongly suggests **Crohn’s Disease**. The pathognomonic clue in this question is the **"healthy, normal-appearing rectum"** on proctoscopy. This phenomenon is known as **Rectal Sparing**, which is a hallmark feature of Crohn’s disease. Crohn’s is characterized by transmural inflammation and "skip lesions," often involving the terminal ileum and the perianal region while leaving the rectum unaffected. Perianal complications (fistulae, fissures, abscesses) occur in up to 30% of Crohn’s patients. #### Why the other options are incorrect: * **Ulcerative Colitis (UC):** UC is characterized by continuous mucosal inflammation that **always involves the rectum** (proctitis). Rectal sparing is extremely rare in UC. Furthermore, perianal fistulae are not a feature of UC. * **Amoebic Colitis:** While it causes bloody diarrhea and tenesmus, it typically presents as an acute or subacute infection. It does not cause chronic, indolent perianal fistulae or rectal sparing. * **Ischemic Colitis:** This usually occurs in elderly patients with cardiovascular risk factors. It typically affects the "watershed areas" (splenic flexure) and presents with sudden onset abdominal pain and hematochezia, not chronic fistulae. #### NEET-PG High-Yield Pearls: * **Rectal Sparing:** Classic sign of Crohn’s Disease. * **Fistula-in-ano:** When recurrent or complex, always rule out Crohn’s. * **Transmural Inflammation:** Leads to the "String sign of Kantor" (barium study) and "Creeping fat" (gross pathology). * **Cobblestone Appearance:** Due to deep longitudinal ulcers and intervening normal mucosa. * **Non-caseating Granulomas:** The characteristic histological finding in Crohn’s (absent in UC).

Question 322: Which type of diverticulum is most common in the esophagus?

A. Traction type
B. Pulsion type (Correct Answer)
C. Rolling hernia
D. None of the above

Explanation: **Explanation:** The correct answer is **Pulsion type**. Esophageal diverticula are classified based on their mechanism of formation: pulsion or traction. 1. **Mechanism of Pulsion Diverticula:** These are the most common type and occur due to **increased intraluminal pressure** (often from motility disorders like Achalasia or DES) pushing the mucosa and submucosa through a focal weakness in the muscular wall. They are "false" diverticula because they do not contain all layers of the esophageal wall. The most classic example is **Zenker’s diverticulum**, which occurs at Killian’s dehiscence. Epiphrenic diverticula (located just above the diaphragm) are also pulsion-type. 2. **Why other options are incorrect:** * **Traction type:** These are less common and occur due to external inflammatory forces (e.g., mediastinal lymphadenopathy from Tuberculosis) pulling the esophageal wall outward. These are "true" diverticula (containing all wall layers) and are typically found in the mid-esophagus. * **Rolling hernia:** This refers to a **Paraesophageal Hiatal Hernia**, where the gastric fundus protrudes through the hiatus alongside the esophagus. It is an anatomical defect of the diaphragm, not a diverticulum of the esophageal wall. **High-Yield Clinical Pearls for NEET-PG:** * **Zenker’s Diverticulum:** A pulsion diverticulum located in the **Killian’s triangle** (between thyropharyngeus and cricopharyngeus). Treatment of choice is Cricopharyngeal Myotomy. * **Killian-Jamieson Diverticulum:** Occurs laterally below the cricopharyngeus muscle. * **True vs. False:** Pulsion = False (Mucosa + Submucosa); Traction = True (All layers). * **Most common site:** The pharyngoesophageal junction (Zenker’s) is the most frequent site for esophageal diverticula overall.

Question 323: Several types of gastrointestinal autografts have been used for reconstruction of the esophagus following removal of carcinomas. Most successful reconstructions have been achieved by which of the following autograft?

A. Stomach (Correct Answer)
B. Jejunum
C. Ileum
D. Ascending colon

Explanation: **Explanation:** The **stomach** is the preferred and most commonly used organ for esophageal reconstruction (esophagoplasty) following esophagectomy for carcinoma. **Why the Stomach is the Correct Answer:** 1. **Robust Blood Supply:** The stomach has a rich intramural vascular network. When mobilized, it can be sustained solely by the **right gastroepiploic artery** and the **right gastric artery**, allowing it to reach as high as the neck without necrosis. 2. **Anatomical Simplicity:** It requires only a single anastomosis (esophagogastrostomy), reducing the risk of leaks compared to multi-anastomotic procedures. 3. **Length:** It provides sufficient length to reach the cervical region easily. **Why Other Options are Incorrect:** * **B. Jejunum:** While used for short-segment replacements (especially in the cervical esophagus as a "free flap"), the jejunum has a complex mesenteric vascular arcade that makes it difficult to mobilize to the neck for long-segment reconstruction. It is also prone to ischemia. * **C. Ileum:** Rarely used due to its thin wall and less reliable blood supply compared to the stomach or colon. * **D. Ascending Colon:** The colon (usually the left or transverse colon) is the **second choice** for reconstruction. It is used when the stomach is unavailable (e.g., prior gastric surgery or tumor involvement). However, it is a more complex procedure involving three anastomoses and carries a higher risk of graft failure. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard:** Stomach is the #1 choice for esophageal replacement. * **Vascular Basis:** The mobilized stomach (gastric tube) depends primarily on the **right gastroepiploic artery**. * **Route of Choice:** The **posterior mediastinum** (the original esophageal bed) is the shortest and most physiological route for the graft. * **Colon Interposition:** Used if the stomach is unsuitable; the **left colon** is often preferred over the right due to its more predictable blood supply (via the left colic artery).

Question 324: What is the most common indication for laparotomy in intestinal tuberculosis?

A. Peritonitis
B. Intestinal obstruction (Correct Answer)
C. Doubtful diagnosis
D. Lower gastrointestinal bleeding

Explanation: **Explanation:** Intestinal tuberculosis (TB) most commonly affects the ileocaecal region. The correct answer is **Intestinal Obstruction**, which is the most frequent complication requiring surgical intervention (laparotomy). **1. Why Intestinal Obstruction is Correct:** The pathogenesis of intestinal TB involves three types: ulcerative, hyperplastic, and sclerotic. Chronic inflammation leads to circumferential healing by fibrosis, resulting in **strictures** (single or multiple). Additionally, hyperplastic TB causes thickening of the cecal wall and ileocaecal valve, while mesenteric lymphadenopathy can cause extrinsic compression or kinking. These factors make obstruction the leading indication for surgery. **2. Analysis of Incorrect Options:** * **A. Peritonitis:** Usually occurs due to perforation. While serious, perforation is less common (approx. 1-10%) because the chronic inflammatory process promotes adhesion formation, which tends to localize leaks. * **C. Doubtful Diagnosis:** With advancements in imaging (CT) and colonoscopy with biopsy, surgery for diagnosis alone has decreased, though it remains an indication if malignancy cannot be ruled out. * **D. Lower GI Bleeding:** Massive hemorrhage is rare in intestinal TB because the obliterative endarteritis seen in TB lesions typically prevents significant vessel erosion. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Ileocaecal region (due to high lymphoid tissue density and physiological stasis). * **Surgery of choice for strictures:** Stricturoplasty (to preserve bowel length) is preferred if strictures are multiple and short. * **Ileocaecal TB:** If the segment is non-reconstructible, a **limited resection** (Right Hemicolectomy) is performed. * **Gold Standard Diagnosis:** Demonstration of *M. tuberculosis* on culture or histopathology (caseating granulomas).

Question 325: Which condition is associated with rectal adenoma?

A. Familial polyposis coli
B. Hypokalemia (Correct Answer)
C. Intussusception
D. Hemorrhoids

Explanation: **Explanation:** The correct answer is **Hypokalemia**. Large rectal adenomas, specifically **Villous Adenomas**, are known for their secretory activity. These tumors have a large surface area with finger-like projections that secrete significant amounts of mucus rich in water, sodium, and particularly **potassium**. When these tumors are located in the rectum, the secreted fluid is expelled before the colon can reabsorb the electrolytes. This leads to a clinical triad known as **McKittrick-Wheelock Syndrome**, characterized by: 1. Large volume mucoid diarrhea 2. Severe dehydration 3. Profound **hypokalemia** and hyponatremia **Analysis of Incorrect Options:** * **A. Familial Polyposis Coli (FAP):** While FAP involves hundreds of adenomatous polyps, the specific metabolic association with electrolyte imbalance is a hallmark of large, solitary secretory villous adenomas rather than the polyposis syndrome itself. * **C. Intussusception:** While a polyp can act as a lead point for intussusception in the small bowel or proximal colon, it is an extremely rare complication for a fixed rectal adenoma. * **D. Hemorrhoids:** These are vascular cushions and are not etiologically or pathologically associated with the development of adenomas. **NEET-PG High-Yield Pearls:** * **Villous Adenomas** have the highest malignant potential among all colonic polyps (up to 40%). * **McKittrick-Wheelock Syndrome** is a classic "spotter" for exams involving a patient with chronic mucoid discharge and unexplained low potassium. * The most common symptom of a rectal polyp is **painless rectal bleeding**, but the most characteristic metabolic abnormality is **hypokalemia**.

Question 326: Which malignancy closely mimics achalasia?

A. Carcinoma of the gastric fundus (Correct Answer)
B. Middle esophagus carcinoma
C. Carcinoma of the larynx
D. Thyroid malignancy

Explanation: **Explanation:** The correct answer is **Carcinoma of the gastric fundus**. This condition is the most common cause of **Pseudoachalasia** (secondary achalasia). **Why Option A is correct:** Pseudoachalasia occurs when a malignancy at the gastroesophageal junction (GEJ) or gastric fundus mimics the clinical, radiological, and manometric features of idiopathic achalasia cardia. The tumor causes symptoms by either direct mechanical obstruction of the GEJ or by infiltrating the **myenteric (Auerbach’s) plexus**, leading to impaired relaxation of the Lower Esophageal Sphincter (LES) and aperistalsis. **Why other options are incorrect:** * **Middle esophagus carcinoma:** Typically presents with progressive dysphagia and weight loss, but it does not involve the LES or myenteric plexus in a way that mimics the functional motor patterns of achalasia. * **Carcinoma of the larynx & Thyroid malignancy:** These may cause extrinsic compression or dysphagia in the upper esophagus/hypopharynx, but they do not affect the distal esophageal motility required to mimic achalasia. **High-Yield Clinical Pearls for NEET-PG:** * **Differentiating Features:** Suspect pseudoachalasia over idiopathic achalasia if the patient is **>55 years old**, has a **short duration of symptoms** (<6 months), and exhibits **rapid weight loss**. * **Diagnosis:** While barium swallow shows a "bird’s beak" appearance in both, **endoscopy (OGD scopy)** is mandatory to rule out malignancy. * **Other causes of Pseudoachalasia:** Sarcoidosis, Amyloidosis, and Chagas disease (though Chagas is caused by *Trypanosoma cruzi* and is a common differential in global exams).

Question 327: What pressure should the Sengstaken tube maintain to stop bleeding from varices?

A. 20 mm Hg
B. 25 mm Hg
C. 35 mm Hg (Correct Answer)
D. 45 mm Hg

Explanation: ### Explanation The **Sengstaken-Blakemore (SB) tube** is a triple-lumen device used for the emergency management of life-threatening esophageal variceal hemorrhage when endoscopic therapy is unavailable or unsuccessful. **1. Why 35 mm Hg is correct:** To achieve hemostasis, the pressure in the esophageal balloon must exceed the portal venous pressure. In patients with portal hypertension and bleeding varices, the portal venous pressure typically ranges between **25–30 mm Hg**. Therefore, the esophageal balloon is inflated to a pressure of **35–40 mm Hg** (some texts suggest up to 45 mm Hg, but 35–40 mm Hg is the standard therapeutic range) to provide adequate tamponade against the variceal walls. **2. Analysis of Incorrect Options:** * **A (20 mm Hg) & B (25 mm Hg):** These pressures are too low. Since they are often lower than or equal to the portal venous pressure in a bleeding patient, they would fail to provide sufficient compression to stop the hemorrhage. * **D (45 mm Hg):** While 45 mm Hg might stop the bleeding, it is at the extreme upper limit. Maintaining pressures consistently above 40–45 mm Hg significantly increases the risk of esophageal mucosal ischemia, necrosis, and perforation. **3. High-Yield Clinical Pearls for NEET-PG:** * **Lumens:** The SB tube has 3 lumens (Gastric aspiration, Gastric balloon, Esophageal balloon). The **Minnesota tube** has a 4th lumen for esophageal aspiration to prevent aspiration pneumonia. * **Initial Step:** Always inflate the **gastric balloon** first (with 250–300 ml of air) and anchor it against the gastroesophageal junction before inflating the esophageal balloon. * **Safety:** A pair of **scissors** must be kept at the bedside to cut the tube and deflate balloons immediately if the patient develops acute respiratory distress (due to upward migration of the balloon). * **Duration:** It is a temporary bridge (max 24 hours) due to the high risk of pressure necrosis.

Question 328: Goodsall's rule is used to predict the anatomy of which condition?

A. Internal hemorrhoids
B. Fistula in ano (Correct Answer)
C. Anal fissure
D. Ischiorectal fossa abscess

Explanation: **Explanation:** **Goodsall’s Rule** is a clinical guideline used to predict the trajectory of a fistula tract based on the location of its external opening relative to a transverse line drawn across the mid-anal canal. * **The Concept:** * **Posterior Openings:** If the external opening is posterior to the transverse line, the tract follows a **curved** path to enter the anal canal at the midline (6 o’clock position). * **Anterior Openings:** If the external opening is anterior to the transverse line, the tract follows a **straight** radial path to the nearest internal opening. * *Exception:* Anterior openings more than 3 cm from the anal verge usually follow a curved path to the posterior midline (acting like posterior openings). **Analysis of Options:** * **B. Fistula in ano (Correct):** Goodsall’s rule is specifically designed to help surgeons locate the internal opening during surgery for anal fistulae, minimizing the risk of recurrence or sphincter damage. * **A. Internal hemorrhoids:** These are graded by the degree of prolapse (Goligher’s classification), not by tract anatomy. * **C. Anal fissure:** These are longitudinal tears in the anoderm, most commonly found in the posterior midline. They do not involve tracts. * **D. Ischiorectal fossa abscess:** While an abscess can lead to a fistula, Goodsall’s rule specifically describes the established epithelialized tract of a fistula. **High-Yield Clinical Pearls for NEET-PG:** * **Park’s Classification:** The most common type of fistula-in-ano is **Intersphincteric**. * **Goodsall’s Rule Exception:** Remember the "3 cm rule"—long-tract anterior fistulae behave like posterior ones. * **Investigation of Choice:** **MRI (Pelvis)** is the gold standard for complex or recurrent fistulae to map the anatomy accurately.

Question 329: A 35-year-old male with a six-year history of chronic duodenal ulcer presents with worsening of symptoms, loss of periodicity, pain on rising in the morning, a sense of epigastric bloating, and post-prandial vomiting. What is the most likely cause of the worsening of his symptoms?

A. Posterior penetration
B. Gastric outlet obstruction (Correct Answer)
C. Carcinoma
D. Pancreatitis

Explanation: **Explanation:** The patient’s clinical presentation is classic for **Gastric Outlet Obstruction (GOO)**, a known complication of chronic duodenal ulcers. **Why the correct answer is right:** 1. **Loss of Periodicity:** Chronic peptic ulcer disease (PUD) typically features "periodicity" (pain that comes and goes). When pain becomes constant, it suggests a complication like obstruction or penetration. 2. **Vomiting & Bloating:** Post-prandial vomiting (often containing undigested food eaten hours prior) and epigastric fullness are hallmark signs of mechanical obstruction at the pylorus or duodenum due to cicatrization (scarring). 3. **Pain on rising:** In GOO, the stomach fails to empty overnight. The accumulation of gastric secretions and undigested food leads to distension and pain by morning. **Why incorrect options are wrong:** * **Posterior penetration:** This typically presents with pain radiating to the back that is not relieved by antacids. It does not cause the characteristic vomiting seen here. * **Carcinoma:** While gastric cancer can cause GOO, it is extremely rare in the duodenum. Given the 6-year history of duodenal ulcer, benign cicatricial stenosis is far more likely. * **Pancreatitis:** This presents with acute, severe epigastric pain radiating to the back, often with elevated amylase/lipase, rather than chronic obstructive symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Metabolic Profile:** GOO leads to **Metabolic Alkalosis (Hypochloremic, Hypokalemic)** with **Paradoxical Aciduria**. * **Physical Exam:** Look for a **Succussion Splash** (heard 3+ hours after a meal) and visible gastric peristalsis (left to right). * **Management:** Initial steps include "drip and suck" (NG decompression and IV fluids). The definitive surgical treatment of choice for cicatricial GOO is often **Truncal Vagotomy with Gastrojejunostomy** or Antrectomy.

Question 330: Which of the following is NOT a predisposing factor for esophageal cancer?

A. Tylosis
B. Achalasia
C. Barrett's esophagus
D. Esophageal varices (Correct Answer)

Explanation: **Explanation:** The correct answer is **Esophageal varices**. Esophageal varices are dilated submucosal veins caused by portal hypertension (most commonly due to liver cirrhosis). While they carry a high risk of life-threatening hemorrhage, they are a vascular pathology and do not involve mucosal dysplasia or chronic inflammation that leads to malignancy. **Why other options are predisposing factors:** * **Tylosis (Howel-Evans Syndrome):** An autosomal dominant condition characterized by hyperkeratosis of palms and soles. It has a near 100% lifetime risk of developing **Squamous Cell Carcinoma (SCC)** of the esophagus. * **Achalasia Cardia:** Chronic stasis of food leads to esophagitis and fermentation, causing chronic mucosal irritation. This increases the risk of **SCC** (typically occurring 15–20 years after symptom onset). * **Barrett's Esophagus:** This is the most significant risk factor for **Adenocarcinoma**. It involves intestinal metaplasia (replacement of squamous epithelium with columnar epithelium) due to chronic GERD. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type worldwide:** Squamous Cell Carcinoma (SCC). * **Most common type in the West/increasing incidence:** Adenocarcinoma. * **Plummer-Vinson Syndrome:** Triad of iron deficiency anemia, glossitis, and esophageal webs; predisposes to SCC of the post-cricoid region. * **Corrosive Injury:** History of lye ingestion increases SCC risk significantly. * **Dietary factors:** Nitrosamines, betel nut chewing, and hot beverages are linked to SCC; Obesity and GERD are linked to Adenocarcinoma.

Practice by Chapter

Esophageal Disorders

Practice Questions

Gastric Disorders

Practice Questions

Small Intestine Pathology

Practice Questions

Appendicitis

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Intestinal Obstruction

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Diverticular Disease

Practice Questions

Anorectal Disorders

Practice Questions

Colorectal Neoplasms

Practice Questions

Gastrointestinal Stomas

Practice Questions

Bariatric Surgery Principles

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free