Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 831: Endoscopy is useful in the diagnosis of peptic ulcer in the following situations, except?

A. Post bulbar ulcer
B. Stomal ulcers
C. Giant duodenal ulcer (Correct Answer)
D. Duodenal erosion

Explanation: **Explanation:** The correct answer is **C. Giant duodenal ulcer**. **Why it is the correct answer:** A giant duodenal ulcer (GDU) is typically defined as an ulcer >2 cm in diameter. While endoscopy is the gold standard for most peptic ulcers, GDUs can be paradoxically difficult to diagnose via endoscopy. This is because the ulcer is so large that it replaces the entire duodenal bulb; the endoscopist may mistake the large, epithelialized ulcer crater for a **normal or dilated duodenal lumen**, leading to a false-negative result. In such cases, a **Barium swallow/meal** is often superior as it clearly demonstrates the "clover-leaf" deformity or the massive crater. **Analysis of incorrect options:** * **Post-bulbar ulcer:** These occur beyond the first part of the duodenum. They are easily missed on barium studies due to overlapping shadows but are clearly visualized with a flexible fiberoptic endoscope. * **Stomal ulcers:** These occur at the site of a previous anastomosis (e.g., Gastrojejunostomy). Endoscopy is the investigation of choice here to differentiate between suture granulomas, marginal ulcers, or malignancy. * **Duodenal erosions:** These are superficial mucosal breaks that do not penetrate the muscularis mucosa. They are too shallow to be detected on radiological imaging (Barium) and can only be diagnosed via direct endoscopic visualization. **Clinical Pearls for NEET-PG:** * **Investigation of Choice (IOC)** for Peptic Ulcer Disease: Upper GI Endoscopy (UGIE). * **Giant Duodenal Ulcer:** Most common site is the posterior wall; carries a high risk of perforation and massive hemorrhage. * **Endoscopic sign of GDU:** The "Large Crater" sign. * **Zollinger-Ellison Syndrome:** Suspect if ulcers are multiple, post-bulbar, or refractory to treatment.

Question 832: All of the following predispose to gastric carcinoma except?

A. Achlorhydria
B. O blood group (Correct Answer)
C. Pernicious anaemia
D. Post gastrectomy

Explanation: **Explanation:** The correct answer is **B. O blood group**. In gastric surgery and oncology, it is a high-yield fact that **Blood Group A** is associated with an increased risk of gastric carcinoma (specifically the diffuse type), whereas **Blood Group O** is associated with an increased risk of **Peptic Ulcer Disease (PUD)**. **Why the other options are incorrect (Risk Factors for Gastric Cancer):** * **A. Achlorhydria:** Reduced gastric acid secretion leads to an increase in gastric pH. This allows for the colonization of nitrate-reducing bacteria, which convert dietary nitrates into carcinogenic **N-nitroso compounds**, predisposing the mucosa to malignancy. * **C. Pernicious Anaemia:** This is an autoimmune condition resulting in the destruction of parietal cells, leading to **atrophic gastritis** and achlorhydria. Patients with pernicious anemia have a 2-3 fold increased risk of developing gastric adenocarcinoma and carcinoid tumors. * **D. Post-gastrectomy:** Patients who have undergone a distal gastrectomy (especially **Billroth II** reconstruction) are at risk. Reflux of bile and pancreatic secretions into the gastric remnant causes chronic inflammation and intestinal metaplasia. This risk typically manifests **15–20 years** after the initial surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Historically the antrum, but the incidence of proximal (cardia) tumors is rising. * **Most common histological type:** Adenocarcinoma (Lauren Classification: Intestinal vs. Diffuse). * **Dietary factors:** Smoked foods, high salt, and nitrates increase risk; Vitamin C and E are protective. * **Genetic association:** Mutations in the **CDH1 gene** (encoding E-cadherin) are linked to Hereditary Diffuse Gastric Cancer (HDGC).

Question 833: Which of the following is the commonest site for adenocarcinoma of the colon?

A. Cecum
B. Sigmoid colon (Correct Answer)
C. Ascending colon
D. Transverse colon

Explanation: **Explanation:** Colorectal cancer is one of the most common malignancies of the gastrointestinal tract. While the incidence of right-sided (proximal) colon cancers has been increasing in recent decades, the **sigmoid colon** remains the most common site for adenocarcinoma within the colon itself. **1. Why Sigmoid Colon is Correct:** Statistically, the distal colon is more prone to malignancy. The sigmoid colon accounts for approximately **25–35%** of all colorectal cancers. This is attributed to the prolonged contact time of concentrated fecal matter and carcinogens with the mucosa in this segment. When considering the entire "colorectum," the rectum is the single most common site (approx. 35-40%), but among the specific segments of the **colon**, the sigmoid leads. **2. Analysis of Incorrect Options:** * **Cecum (A):** This is the second most common site (approx. 15–20%). Cancers here often present with occult bleeding and iron deficiency anemia rather than obstruction. * **Ascending Colon (C):** While "right-sided" cancers are rising in frequency (especially in older females and those with HNPCC), the ascending colon specifically is less common than the sigmoid. * **Transverse Colon (D):** This is one of the least common sites for primary adenocarcinoma, accounting for only about 10% of cases. **Clinical Pearls for NEET-PG:** * **Overall Distribution:** Rectum (38%) > Sigmoid (25%) > Cecum (18%) > Ascending Colon (9%). * **Clinical Presentation:** Left-sided lesions (Sigmoid) typically present with **altered bowel habits** and **intestinal obstruction** (due to narrower lumen and solid stools). Right-sided lesions (Cecum) present with **anemia** and a **palpable mass** in the right iliac fossa. * **Apple Core Appearance:** This classic radiological sign on barium enema is most frequently seen in the sigmoid colon due to annular constricting tumors.

Question 834: All of the following are surgical operations for gastroesophageal reflux disease except?

A. Heller's cardiomyotomy (Correct Answer)
B. Belsey operation
C. Nissen fundoplication
D. Hill procedure

Explanation: The goal of surgical management in **Gastroesophageal Reflux Disease (GERD)** is to restore the competence of the Lower Esophageal Sphincter (LES) by increasing its pressure and length. ### **Explanation of Options:** * **Heller’s Cardiomyotomy (Correct Answer):** This is the surgical treatment of choice for **Achalasia Cardia**, not GERD. It involves incising the longitudinal and circular muscle fibers of the distal esophagus and proximal stomach to *decrease* LES pressure and allow food passage. Interestingly, because this procedure destroys the reflux barrier, it is almost always performed alongside a partial fundoplication (like Dor or Toupet) to prevent post-operative GERD. * **Nissen Fundoplication:** The "Gold Standard" for GERD. It is a **360° total wrap** of the gastric fundus around the lower esophagus, usually performed laparoscopically. * **Belsey Mark IV Operation:** A **270° partial anterior wrap** performed via a **transthoracic** approach. It is often preferred when there is significant esophageal shortening or when abdominal access is difficult. * **Hill Procedure:** Also known as posterior gastropexy. It involves anchoring the phrenoesophageal bundle to the **median arcuate ligament**, thereby narrowing the cardia and increasing the intra-abdominal length of the esophagus. ### **High-Yield Clinical Pearls for NEET-PG:** * **Toupet Fundoplication:** A 270° posterior wrap; preferred if esophageal motility is poor to avoid post-op dysphagia. * **Dor Fundoplication:** A 180-200° anterior wrap; commonly used post-Heller’s myotomy. * **Angelchik Prosthesis:** An obsolete C-shaped silicone ring once used for GERD (high complication rate). * **DeMeester Score:** Used in 24-hour pH monitoring to quantify reflux; a score **>14.72** indicates significant GERD.

Question 835: What are the features of colonic obstruction?

A. Absolute obstipation (no passage of gas)
B. No passage of stools
C. Abdominal distention
D. All of the above (Correct Answer)

Explanation: **Explanation:** Colonic obstruction is a form of large bowel obstruction (LBO) characterized by the failure of intestinal contents to pass through the colon. The clinical presentation is defined by a classic triad: **abdominal pain, distention, and absolute obstipation.** 1. **Absolute Obstipation (Option A & B):** This refers to the complete absence of passage of both flatus (gas) and feces. In a complete obstruction, once the bowel distal to the site of blockage is emptied, no further material can pass. This is a hallmark sign of mechanical obstruction. 2. **Abdominal Distention (Option C):** Because the colon is a storage organ with a larger diameter than the small bowel, gas and fluid accumulate significantly proximal to the obstruction. If the ileocecal valve is competent (closed-loop obstruction), the distention can be massive and carries a high risk of cecal perforation (Laplace’s Law). **Why "All of the above" is correct:** In clinical practice, these features do not occur in isolation. A patient presenting with a mechanical blockage (most commonly due to Colorectal Cancer, Volvulus, or Diverticulitis) will progressively develop distention followed by the cessation of gas and stool passage. **Clinical Pearls for NEET-PG:** * **Most common cause of LBO:** Colorectal Cancer (specifically on the left side). * **Most common cause of Volvulus:** Sigmoid colon. * **X-ray finding:** Peripheral distribution of dilated bowel loops with haustral markings (which do not cross the entire width of the bowel, unlike *valvulae conniventes* in the small bowel). * **Laplace’s Law:** The risk of perforation is highest at the **Cecum** because it has the largest diameter; a diameter >10–12 cm is a surgical emergency.

Question 836: In villous papilloma of the rectum, which ion is predominantly lost?

A. Na+
B. K+ (Correct Answer)
C. Ca++
D. Cl-

Explanation: **Explanation:** **Villous adenomas (papillomas)** of the rectum are unique among colonic tumors due to their large surface area and high secretory activity. These tumors are composed of frond-like projections that secrete massive amounts of mucus rich in proteins and electrolytes. **Why K+ is the correct answer:** The primary clinical hallmark of a large villous papilloma is **secretory diarrhea**. The tumor cells actively secrete mucus containing high concentrations of **Potassium (K+)** and bicarbonate. When the tumor is located in the distal rectum, the colon lacks the transit time to reabsorb these secretions. This leads to the classic **McKittrick-Wheelock Syndrome**, characterized by chronic watery diarrhea, severe hypokalemia, hyponatremia, and dehydration. Among all ions, the depletion of Potassium is the most clinically significant and characteristic finding. **Why other options are incorrect:** * **Na+ and Cl-:** While sodium and chloride are lost in the secretory fluid, the body has more robust mechanisms to compensate for their loss compared to potassium. The disproportionate loss of K+ in the mucus makes hypokalemia the predominant electrolyte abnormality. * **Ca++:** Calcium levels are generally not significantly affected by the secretory activity of villous adenomas. **Clinical Pearls for NEET-PG:** * **McKittrick-Wheelock Syndrome:** The triad of a large rectal villous adenoma, chronic secretory diarrhea, and severe depletion of fluid/electrolytes (mainly K+). * **Malignant Potential:** Villous adenomas have the highest risk of malignant transformation (up to 40-50%) among all colonic adenomas. * **Presentation:** Patients often present with "spurious diarrhea" or passage of clear, egg-white-like mucus per rectum.

Question 837: Which of the following is a side effect of vagotomy?

A. Delayed gastric emptying
B. Gastric atony
C. Diarrhea
D. All of the above (Correct Answer)

Explanation: **Explanation:** Vagotomy involves the surgical resection of the Vagus nerve (Cranial Nerve X), which provides the primary parasympathetic innervation to the gastrointestinal tract. The Vagus nerve is responsible for stimulating gastric acid secretion and maintaining gastrointestinal motility through the "rest and digest" response. **Why "All of the Above" is correct:** 1. **Gastric Atony & Delayed Gastric Emptying:** The Vagus nerve controls the receptive relaxation of the fundus and the peristaltic pump of the antrum. Denervation leads to a loss of muscular tone (**Gastric Atony**) and failure of the antral pump to push solids into the duodenum, resulting in **Delayed Gastric Emptying**. This is why a drainage procedure (like Pyloroplasty or Gastrojejunostomy) is mandatory with a Truncal Vagotomy. 2. **Diarrhea:** Post-vagotomy diarrhea occurs in approximately 5–10% of patients. It is attributed to rapid emptying of hypertonic fluids into the small bowel (dumping), increased bile acid malabsorption, and altered intestinal motility. **High-Yield Clinical Pearls for NEET-PG:** * **Truncal Vagotomy (TV):** Highest rate of side effects (diarrhea, gallstones due to biliary stasis) but lowest recurrence rate for ulcers. * **Highly Selective Vagotomy (HSV):** Denervates only the acid-secreting parietal cell mass; preserves the nerve of Latarjet (antral pump) and celiac/hepatic branches. It **does not** require a drainage procedure and has the lowest incidence of diarrhea/dumping. * **Most common side effect of TV:** Diarrhea. * **Most common complication of HSV:** Recurrence of the ulcer.

Question 838: What is the most common cause of painful defecation?

A. Fissure in ano (Correct Answer)
B. Fistula in ano
C. External haemorrhoid
D. Internal haemorrhoid

Explanation: **Explanation:** The hallmark clinical feature of an **anal fissure** is severe, sharp, "knife-like" pain during and after defecation. This occurs because a linear tear in the distal anal canal (usually in the posterior midline) exposes the sensitive internal anal sphincter. The contact of stool with the tear triggers a **reflex spasm of the internal sphincter**, which leads to ischemia and intense, prolonged pain that can last for hours after the bowel movement. **Analysis of Incorrect Options:** * **Fistula in ano:** Typically presents with chronic purulent discharge and perianal itching. While it can be uncomfortable, it is generally not characterized by acute, severe pain unless an associated anorectal abscess has formed. * **External haemorrhoid:** These are usually asymptomatic unless they become **thrombosed**. A thrombosed external hemorrhoid causes sudden, constant, exquisite pain, but it is not specifically linked only to the act of defecation. * **Internal haemorrhoid:** These are characteristically **painless**. Their primary symptom is bright red, painless bleeding per rectum (painless streaks of blood on stool). Pain only occurs if they become prolapsed, strangulated, or thrombosed. **Clinical Pearls for NEET-PG:** * **Location:** 90% of primary fissures are in the **posterior midline**. An off-center (lateral) fissure should raise suspicion for systemic diseases like Crohn’s, TB, or HIV. * **Chronic Fissure Triad:** Sentinel pile (skin tag), hypertrophied anal papilla, and the visible internal sphincter fibers at the base of the ulcer. * **Management:** The gold standard surgical treatment is **Lateral Internal Sphincterotomy (LIS)**, which reduces the resting anal pressure.

Question 839: What is the appropriate fluid management for a patient with gastric outlet obstruction?

A. Normal saline (Correct Answer)
B. Hypertonic saline
C. Sodium bicarbonate to counteract aciduria
D. Hypotonic saline without potassium

Explanation: **Explanation:** Gastric Outlet Obstruction (GOO) results in persistent vomiting of gastric contents, leading to a classic metabolic derangement: **Hypochloremic, hypokalemic, metabolic alkalosis with paradoxical aciduria.** **1. Why Normal Saline (0.9% NaCl) is the Correct Choice:** The primary deficits in GOO are water, sodium, and chloride. Normal Saline is the fluid of choice because it is "isotonic" and contains a high concentration of chloride (154 mEq/L). Administering chloride allows the kidneys to excrete bicarbonate (correcting the alkalosis) and restores the circulating volume. Once adequate urine output is established, potassium is added to the saline to correct the hypokalemia. **2. Analysis of Incorrect Options:** * **Hypertonic saline:** This is used for symptomatic hyponatremia, not for volume resuscitation in GOO. It would worsen dehydration by drawing water out of cells. * **Sodium bicarbonate:** This is contraindicated. The patient is already in metabolic alkalosis; adding bicarbonate would worsen the pH imbalance. * **Hypotonic saline without potassium:** Hypotonic fluids do not stay in the intravascular space effectively for resuscitation. Furthermore, potassium replacement is essential in GOO management (after ensuring renal function) to correct the intracellular deficit and stop paradoxical aciduria. **NEET-PG High-Yield Pearls:** * **Paradoxical Aciduria:** In severe GOO, the body prioritizes volume (via Aldosterone) over pH. To save Na+, the kidney eventually exchanges H+ ions instead of K+ (which is depleted), leading to acidic urine despite systemic alkalosis. * **Initial Fluid:** Always start with 0.9% Normal Saline. * **Maintenance:** Switch to 5% Dextrose-Saline with added Potassium Chloride (KCl) once resuscitation is underway. * **Diagnosis:** The "Succussion splash" and "Saline load test" are classic clinical/bedside markers for GOO.

Question 840: What is the most common symptom seen in a paraesophageal hernia?

A. Dysphagia (Correct Answer)
B. Heartburn
C. Regurgitation
D. Shortness of breath

Explanation: **Explanation:** In a **Paraesophageal Hernia (Type II, III, and IV)**, the gastric fundus (and sometimes other viscera) herniates into the chest alongside the esophagus, while the gastroesophageal junction (GEJ) often remains in its normal anatomical position. **Why Dysphagia is the correct answer:** Unlike sliding hernias, the primary mechanism of symptoms in paraesophageal hernias is **mechanical compression**. As the stomach herniates through the hiatus, it can compress the adjacent esophagus or cause a "volvulus-like" twisting of the stomach. This mechanical obstruction leads to **dysphagia** (difficulty swallowing) and post-prandial fullness, which are the most characteristic presenting symptoms. **Analysis of Incorrect Options:** * **B & C (Heartburn and Regurgitation):** These are classic symptoms of **Gastroesophageal Reflux Disease (GERD)**, which is most commonly associated with **Sliding Hiatal Hernias (Type I)**. In pure paraesophageal hernias, the GEJ remains competent, so acid reflux is less common. * **D (Shortness of breath):** While large hernias can cause dyspnea due to lung compression, it is a less frequent presenting symptom compared to the mechanical digestive symptoms. **High-Yield Clinical Pearls for NEET-PG:** * **Most common type of Hiatal Hernia:** Type I (Sliding) – 95% of cases. * **Most common symptom of Sliding Hernia:** Heartburn/GERD. * **Most common symptom of Paraesophageal Hernia:** Dysphagia/Post-prandial fullness. * **Complications:** Paraesophageal hernias carry a high risk of **gastric volvulus, incarceration, and strangulation**, often necessitating surgical repair even if asymptomatic (unlike sliding hernias). * **Cameron Ulcers:** Linear gastric erosions found within the herniated sac due to mechanical trauma; they can lead to chronic iron deficiency anemia.

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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