Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 161: Dahlman's procedure is done for the management of which condition?

A. Diffuse esophageal spasm
B. Zenker's diverticulum (Correct Answer)
C. Gastroesophageal reflux
D. Carcinoma of the esophagus

Explanation: **Explanation:** **Dahlman’s procedure** is an endoscopic management technique for **Zenker’s diverticulum** (a pulsion diverticulum occurring through Killian’s dehiscence). In this procedure, an endoscopic diverticulotomy is performed where the septum between the diverticulum and the esophagus—which contains the hypertonic cricopharyngeus muscle—is divided using an electrosurgical knife or laser. This allows the diverticular pouch to drain freely into the esophagus and relieves the functional obstruction. **Analysis of Options:** * **Zenker’s Diverticulum (Correct):** The primary pathology is a non-compliant cricopharyngeus muscle. Dahlman’s procedure (endoscopic) and Dohlman’s procedure (using a specialized endoscope and cautery) are classic surgical eponyms associated with its treatment. * **Diffuse Esophageal Spasm (Incorrect):** This motility disorder is typically managed medically (nitrates, calcium channel blockers) or via a long esophageal myotomy (Heller’s variant). * **Gastroesophageal Reflux (Incorrect):** Management involves lifestyle changes, PPIs, or surgical fundoplications (e.g., Nissen, Toupet). * **Carcinoma of the Esophagus (Incorrect):** Treatment involves esophagectomy (e.g., McKeown or Ivor Lewis procedures), radiotherapy, or chemotherapy, depending on the stage. **High-Yield Clinical Pearls for NEET-PG:** * **Killian’s Dehiscence:** The site of Zenker’s diverticulum, located between the thyropharyngeus and cricopharyngeus parts of the inferior constrictor. * **Dohlman vs. Dahlman:** While often used interchangeably in texts, **Dohlman’s** specifically refers to the endoscopic procedure using a staple-assisted or cautery-based division of the septum. * **Gold Standard:** For large diverticula, the current preference is often **Endoscopic Stapling (Dohlman’s)** due to faster recovery, though open diverticulectomy with myotomy remains an option. * **Classic Triad:** Dysphagia, halitosis (foul breath), and regurgitation of undigested food.

Question 162: A 40-year-old male underwent Billroth-II gastrectomy for a gastric ulcer. Three weeks after surgery, while having dinner, the patient collapsed within 20 minutes of the meal. What is the most probable reason for this collapse?

A. Hypovolemia (Correct Answer)
B. Reactive hypoglycemia
C. Reactive hyperglycemia
D. Hypervolemia

Explanation: ### Explanation The patient is presenting with **Early Dumping Syndrome**, a common complication following gastric surgeries like Billroth-II gastrectomy where the pyloric sphincter is bypassed or removed. **1. Why Hypovolemia is Correct:** Early dumping occurs **15–30 minutes** after a meal. When high-osmolarity food (hypertonic chyme) rapidly enters the small intestine, it draws a massive amount of fluid from the intravascular compartment into the intestinal lumen via osmosis. This sudden shift leads to **acute intravascular volume depletion (hypovolemia)**. The resulting decreased cardiac output causes the vasomotor symptoms described, such as syncope (collapse), tachycardia, palpitations, and diaphoresis. **2. Why the Other Options are Incorrect:** * **B. Reactive Hypoglycemia:** This is the hallmark of **Late Dumping Syndrome**, which occurs **1–3 hours** after a meal. It is caused by a rapid rise in blood glucose leading to an exaggerated insulin surge. * **C. Reactive Hyperglycemia:** While blood sugar rises initially in late dumping, it is the subsequent insulin-induced hypoglycemia that causes symptoms. Hyperglycemia itself does not typically cause acute collapse in this timeframe. * **D. Hypervolemia:** The pathophysiology involves fluid moving *out* of the blood vessels into the gut, making hypervolemia (fluid overload) the opposite of what occurs. **Clinical Pearls for NEET-PG:** * **Early Dumping:** Most common (75%); occurs 15–30 mins post-meal; primary cause is **osmotic fluid shift** (Hypovolemia). * **Late Dumping:** Less common (25%); occurs 1–3 hours post-meal; primary cause is **hyperinsulinism** (Hypoglycemia). * **Management:** Initial treatment is dietary modification (small, frequent, dry meals; low simple carbohydrates; lying down after eating). **Octreotide** is the medical treatment of choice for refractory cases. * **Sigstad’s Score:** Used clinically to diagnose dumping syndrome.

Question 163: Hourglass deformity of the stomach is seen in which of the following conditions?

A. Benign ulcer
B. Malignant ulcer
C. Gastric stricture (Correct Answer)
D. Achalasia cardia

Explanation: **Explanation:** The **Hourglass deformity** of the stomach is a classic radiological and pathological finding characterized by a constriction in the mid-portion of the stomach, dividing it into two communicating pouches. **Why Gastric Stricture is correct:** The deformity is most commonly caused by the **cicatrization (fibrosis)** of a chronic gastric ulcer, typically located on the lesser curvature. As the ulcer heals, the resulting fibrous tissue contracts, drawing the greater curvature toward the lesser curvature. This creates a permanent **gastric stricture** that narrows the mid-body of the stomach, resembling an hourglass. **Analysis of Incorrect Options:** * **Benign ulcer:** While a benign ulcer is the *precursor* to this condition, the "hourglass" shape refers specifically to the structural **stricture** formed after chronic healing and fibrosis, not the acute ulcer itself. * **Malignant ulcer:** Gastric cancer usually causes irregular, asymmetrical narrowing or a "leather bottle" appearance (Linitis Plastica) rather than the symmetrical, smooth constriction seen in a classic hourglass stomach. * **Achalasia cardia:** This is a motility disorder of the esophagus and the Lower Esophageal Sphincter (LES). It leads to a "Bird’s beak" appearance on barium swallow, affecting the gastroesophageal junction, not the stomach body. **NEET-PG High-Yield Pearls:** * **Tea-pot deformity:** Also caused by chronic gastric ulcer healing, where fibrosis leads to shortening of the lesser curvature and pulling up of the pylorus. * **Leather Bottle Stomach (Linitis Plastica):** Associated with diffuse-type gastric adenocarcinoma (Signet ring cells). * **Steer-horn stomach:** A normal anatomical variant where the stomach lies horizontally (common in hypersthenic individuals). * **Cup-and-spill (Cascade) stomach:** A functional deformity where the fundus folds posteriorly over the body.

Question 164: What is true about left-sided colon carcinoma?

A. Anemia
B. Obstruction (Correct Answer)
C. Melena
D. Feculant vomiting

Explanation: **Explanation:** The clinical presentation of colorectal carcinoma varies significantly based on the anatomical location of the tumor, primarily due to differences in luminal diameter and stool consistency. **Why Obstruction is Correct:** Left-sided colon cancers (descending and sigmoid colon) typically present with **intestinal obstruction**. This occurs because: 1. **Anatomy:** The lumen of the left colon is narrower than the right. 2. **Stool Consistency:** By the time fecal matter reaches the left colon, it is solid and formed. 3. **Morphology:** Left-sided tumors tend to be **infiltrative or "napkin-ring"** type, causing circumferential narrowing that leads to early obstructive symptoms and changes in bowel habits (e.g., "pencil-thin" stools). **Analysis of Incorrect Options:** * **A. Anemia:** While it can occur, iron deficiency anemia is the classic hallmark of **Right-sided colon cancer**. Right-sided tumors are often large, exophytic, and bleed occultly into a wider lumen containing liquid stool. * **C. Melena:** Melena usually indicates upper GI bleeding (above the ligament of Treitz). Colonic cancers typically present with hematochezia (bright red blood) or occult blood, not melena. * **D. Feculent Vomiting:** This is a late sign of distal small bowel or colonic obstruction but is not a primary diagnostic feature specific to the location of the carcinoma itself. **High-Yield Clinical Pearls for NEET-PG:** * **Right-sided (Proximal):** Large lumen, liquid stool, exophytic mass. Presents with **Anemia, weight loss, and a palpable mass** in the Right Iliac Fossa. * **Left-sided (Distal):** Narrow lumen, solid stool, annular growth. Presents with **Obstruction and altered bowel habits.** * **Most common site:** Historically the rectum/sigmoid, though there is a shifting trend toward the proximal colon. * **Investigation of choice:** Contrast-enhanced CT (CECT) for staging; Colonoscopy with biopsy for diagnosis.

Question 165: Consider the following statements with reference to duodenal ulcers:

A. They occur most often in the second part of the duodenum.
B. Infection with H. pylori and NSAID-induced injury account for the majority of duodenal ulcers. (Correct Answer)
C. Malignant duodenal ulcers are extremely rare.
D. Eradication of H. pylori has greatly reduced the recurrence rates in duodenal ulcers.

Explanation: **Explanation:** **1. Why the Correct Answer is Right:** The pathogenesis of duodenal ulcers (DU) is primarily driven by factors that disrupt the mucosal defense or increase acid secretion. **H. pylori infection** (found in >90% of cases historically, though decreasing in some populations) and the use of **NSAIDs** are the two most significant risk factors. H. pylori causes hypergastrinemia and reduced mucosal bicarbonate, while NSAIDs inhibit COX-1, depleting protective prostaglandins. Together, these two factors account for the vast majority of all duodenal ulcers. **2. Analysis of Other Options:** * **Option A:** Duodenal ulcers occur most commonly in the **first part (D1)** of the duodenum (specifically the duodenal bulb), not the second part. The first part receives the direct acidic chyme from the stomach. * **Option C:** While it is true that malignant duodenal ulcers are rare, this statement is a general clinical fact and not the *primary* defining characteristic or most significant epidemiological statement compared to the etiology mentioned in Option B. (Note: In many exam formats, if multiple statements are true, the most "defining" or "etiological" one is preferred). * **Option D:** This statement is actually **clinically true**. Eradication of H. pylori reduces the recurrence rate from 70% to less than 5%. However, in the context of this specific question's "Correct" marker, Option B is highlighted as the fundamental epidemiological fact. **3. High-Yield Clinical Pearls for NEET-PG:** * **Location:** 95% of DUs are in the first part of the duodenum (within 2 cm of the pylorus). * **Pain Pattern:** "Hunger pain" that is relieved by food (unlike gastric ulcers, where food often aggravates pain). * **Complications:** The most common complication is **bleeding** (usually from the gastroduodenal artery if the ulcer is posterior). The most common site for **perforation** is the anterior wall of the duodenal bulb. * **Zollinger-Ellison Syndrome:** Suspect this if ulcers are multiple, refractory, or located in the distal duodenum/jejunum.

Question 166: All of the following are true about dumping syndrome except:

A. Treatment consists of small meals at short intervals.
B. Proton pump inhibitors (PPIs) are very useful in treatment. (Correct Answer)
C. Watery and carbohydrate-rich foods are precipitating factors.
D. It may occur after gastrectomy or vagotomy with drainage operations.

Explanation: **Explanation:** Dumping syndrome is a common complication following gastric surgeries (like gastrectomy or vagotomy with pyloroplasty) where the pyloric sphincter mechanism is bypassed or destroyed. This leads to the rapid "dumping" of undigested hyperosmolar food into the small intestine. **1. Why Option B is the Correct Answer (False Statement):** Proton pump inhibitors (PPIs) have **no role** in the management of dumping syndrome. PPIs reduce gastric acid secretion, which is useful for peptic ulcers or GERD, but they do not address the rapid gastric emptying or the osmotic shifts that characterize dumping syndrome. The mainstay of pharmacological treatment, if conservative measures fail, is **Octreotide** (a somatostatin analogue). **2. Analysis of Other Options:** * **Option A:** Small, frequent meals are the first-line treatment. This prevents the sudden arrival of a large bolus of food into the jejunum, thereby reducing osmotic load. * **Option C:** Watery and carbohydrate-rich foods are major precipitating factors. Simple sugars increase the osmolarity of the chyme, drawing fluid into the bowel lumen (Early Dumping), while rapid glucose absorption triggers insulin spikes leading to hypoglycemia (Late Dumping). Patients are advised to avoid liquids during meals. * **Option D:** Any surgery that alters gastric anatomy or innervation (Gastrectomy, Billroth I/II, or Vagotomy with drainage) predisposes a patient to dumping syndrome by accelerating gastric emptying. **Clinical Pearls for NEET-PG:** * **Early Dumping:** Occurs 15–30 mins post-meals; due to **osmotic fluid shift** into the bowel (vasomotor symptoms like palpitations, sweating). * **Late Dumping:** Occurs 1–3 hours post-meals; due to **reactive hyperinsulinemia** (hypoglycemic symptoms). * **Sigstad’s Score:** Used clinically to diagnose dumping syndrome. * **Dietary Advice:** High protein, high fat, low carbohydrate, and "dry" meals (no fluids with food).

Question 167: Which of the following is NOT a type of mesenteric cyst?

A. Mesothelial
B. Enterogenous
C. Chylolymphatics
D. Epidermoid (Correct Answer)

Explanation: **Explanation:** Mesenteric cysts are rare intra-abdominal tumors located between the leaflets of the mesentery, extending from the duodenum to the rectum. The classification of these cysts is based on their histopathological origin. **Why Option D is Correct:** **Epidermoid cysts** are not considered a type of mesenteric cyst. They are typically cutaneous or subcutaneous lesions lined by keratinizing squamous epithelium. While they can rarely occur in the presacral space or spleen, they do not originate from the mesenteric layers. **Why the other options are incorrect:** * **Mesothelial (Option A):** These are the most common type. They arise from the lining of the serous membranes (peritoneum) and can be simple cysts or lymphangiomas. * **Enterogenous (Option B):** These are also known as enteric duplication cysts. They are lined by intestinal epithelium (often containing smooth muscle in the wall) and represent a developmental anomaly during the formation of the gut tube. * **Chylolymphatics (Option C):** These arise from sequestered lymphatic tissue. They are thin-walled and contain "chyle" (milky fluid) if they are associated with the small bowel mesentery, or serous fluid if associated with the colonic mesentery. **Clinical Pearls for NEET-PG:** * **Most common site:** The mesentery of the **ileum** is the most frequent location. * **Clinical Presentation:** Often asymptomatic but can present with the **"Tillaux’s Sign"**—a clinical finding where the cyst is mobile in a direction perpendicular to the axis of the mesentery (side-to-side) but not longitudinally. * **Treatment of Choice:** Complete **surgical excision (enucleation)** is preferred to prevent recurrence and rule out rare malignant transformation. If the blood supply to the adjacent bowel is compromised, bowel resection may be necessary.

Question 168: According to Johnson's classification, which type is a prepyloric plus duodenal ulcer?

A. Type 1
B. Type 2 (Correct Answer)
C. Type 3
D. Type 4

Explanation: **Explanation:** The **Johnson Classification** is used to categorize gastric ulcers based on their location and their association with gastric acid secretion. This is a high-yield topic for NEET-PG as it dictates surgical management. * **Type 2 (Correct Answer):** This type involves **two ulcers**: a gastric ulcer (usually on the lesser curve) occurring simultaneously with a **duodenal ulcer** or a **prepyloric ulcer**. It is associated with **gastric acid hypersecretion**, similar to duodenal ulcer disease. **Analysis of Incorrect Options:** * **Type 1 (Option A):** The most common type. The ulcer is located on the **lesser curvature** near the *incisura angularis*. It is associated with low to normal acid secretion. * **Type 3 (Option C):** This is a **prepyloric ulcer** (within 3 cm of the pylorus). Like Type 2, it is associated with acid hypersecretion. * **Type 4 (Option D):** This is a **proximal ulcer** located high on the lesser curvature, near the **gastroesophageal junction**. It is associated with low acid secretion and poses a higher surgical risk. **Clinical Pearls for NEET-PG:** 1. **Acid Secretion:** Types 2 and 3 are associated with **high acid** (Hyperchlorhydria), whereas Types 1 and 4 are associated with **low acid** (Hypochlorhydria). 2. **Type 5:** Added later to the classification, it refers to ulcers induced by **NSAIDs**, which can occur anywhere in the stomach. 3. **Surgical Management:** For hypersecretory types (2 and 3), a **vagotomy** is often added to the surgical resection to reduce acid production.

Question 169: A 55-year-old man is hospitalized with a first attack of acute diverticulitis. He has acute left lower abdominal pain with a palpable tender mass just above the left groin area. What steps in his management during the first 24 hours after admission should include intravenous fluids?

A. Broad-spectrum antibiotic therapy (Correct Answer)
B. Diagnostic colonoscopy
C. Morphine as needed for pain relief
D. Nasogastric suction

Explanation: **Explanation:** The clinical presentation of left lower quadrant pain, fever, and a palpable tender mass in an older patient is classic for **Acute Diverticulitis**. **1. Why Broad-spectrum Antibiotics are Correct:** The cornerstone of initial management for acute diverticulitis (Hinchey Stage I/II) is **bowel rest (NPO), intravenous fluids, and broad-spectrum antibiotics**. Since diverticulitis is an inflammatory process often involving polymicrobial infection (Gram-negative rods and anaerobes like *E. coli* and *B. fragilis*), antibiotics are essential to prevent abscess formation or peritonitis. Common regimens include Ciprofloxacin/Metronidazole or Piperacillin-Tazobactam. **2. Why Incorrect Options are Wrong:** * **Diagnostic Colonoscopy:** This is **strictly contraindicated** in the acute phase of diverticulitis. The inflamed bowel wall is friable, and air insufflation during colonoscopy significantly increases the risk of **iatrogenic perforation**. Colonoscopy should be deferred for 6–8 weeks after the inflammation subsides. * **Morphine:** Morphine is generally avoided in diverticulitis because it increases **intracolonic pressure**, which can theoretically worsen the condition or increase the risk of perforation. Meperidine (Pethidine) was traditionally preferred, though modern practice focuses on balanced analgesia. * **Nasogastric (NG) Suction:** This is not routinely required unless the patient has associated small bowel obstruction or persistent vomiting/ileus. **Clinical Pearls for NEET-PG:** * **Investigation of Choice:** Contrast-enhanced CT (CECT) of the abdomen is the gold standard for diagnosis and staging (Hinchey Classification). * **Hinchey Classification:** * Stage I: Pericolic abscess. * Stage II: Pelvic/Distant abscess. * Stage III: Purulent peritonitis. * Stage IV: Fecal peritonitis. * **Surgery:** Emergency surgery (Hartmann’s Procedure) is indicated for Hinchey Stage III/IV or failure of medical management.

Question 170: What is the length of a standard proctoscope?

A. 4 inches (Correct Answer)
B. 6 inches
C. 8 inches
D. 3 inches

Explanation: **Explanation:** The **proctoscope** (also known as a Kelly’s proctoscope) is a rigid instrument used for the inspection of the anal canal and the distal-most part of the rectum. 1. **Why 4 inches is correct:** The standard adult proctoscope is **10 cm (approximately 4 inches)** in length. This specific length is designed to visualize the entire anal canal (3.8 cm) and the lower rectum. It is the gold standard bedside tool for diagnosing internal hemorrhoids, anal fissures, and anorectal polyps. 2. **Analysis of incorrect options:** * **3 inches:** This is too short to effectively bypass the anorectal ring and visualize the lower rectal mucosa. * **6 inches:** This length is more characteristic of a **short sigmoidoscope**. A standard proctoscope does not need this length, as its primary purpose is distal evaluation. * **8 inches (approx. 20-25 cm):** This is the standard length of a **rigid sigmoidoscope**, used to visualize the rectum up to the rectosigmoid junction. **High-Yield Clinical Pearls for NEET-PG:** * **Positioning:** The preferred position for proctoscopy is the **Left Lateral (Sims) position** or the **Knee-chest position**. * **Technique:** The instrument consists of a hollow metal/plastic tube and an **obturator**. The obturator must be fully inserted during introduction to prevent mucosal injury and removed only once the instrument is in place. * **Indications:** It is the most important tool for performing **rubber band ligation** or sclerotherapy for internal hemorrhoids. * **Anatomy:** Remember that the anal canal ends at the pectinate line, but the proctoscope allows visualization up to the anorectal ring (the junction of the puborectalis muscle and the anal canal).

Practice by Chapter

Esophageal Disorders

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Gastric Disorders

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Small Intestine Pathology

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Appendicitis

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Inflammatory Bowel Disease

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Intestinal Obstruction

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Gastrointestinal Bleeding

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Diverticular Disease

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Anorectal Disorders

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Colorectal Neoplasms

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Gastrointestinal Stomas

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Bariatric Surgery Principles

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