Gastrointestinal Surgery — MCQs

A 60-year-old male presents with a reducible rectal mass that protrudes during defecation and straining. On examination, a full-thickness protrusion through the anus is noted with concentric mucosal folds and a palpable sulcus. He is considered a high anesthetic risk. What is the preferred surgical treatment?

Q555Medium

What is meant by the Mc stages of colon cancer?

Q556Medium

A 30-year-old female presents with progressive dysphagia for both solids and liquids, and heartburn. The symptoms have been worsening over the past few months, accompanied by a significant weight loss of 6 kg in 2 months. Barium swallow revealed a bird beak deformity. What is the most likely diagnosis?

Q557Easy

Which of the following veins is NOT involved in the formation of gastric varices?

Q558Easy

Common sites for Cushing ulcers include all of the following except?

Q559Medium

What is the primary risk associated with acute mechanical large bowel obstruction that necessitates early surgical intervention?

Q560Easy

Which type of malignancy is most commonly associated with an anorectal fistula?

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 551: Which of the following statements regarding Crohn's disease is correct?

A. Crohn's disease has no increased risk for colonic cancer.
B. Medical management includes antibiotics, immunosuppressive agents, and biologic agents. (Correct Answer)
C. Crohn's disease has no effect on fertility.
D. An associated enteroenteric fistula is an indication for urgent surgery.

Explanation: **Explanation:** **Correct Answer: B. Medical management includes antibiotics, immunosuppressive agents, and biologic agents.** Crohn’s disease is a chronic inflammatory bowel disease (IBD) managed primarily through a step-up or top-down pharmacological approach. **Antibiotics** (Metronidazole, Ciprofloxacin) are used for perianal disease and abscesses. **Immunosuppressants** (Azathioprine, 6-Mercaptopurine, Methotrexate) help maintain remission, while **Biologics** (Infliximab, Adalimumab) target TNF-alpha to induce and maintain remission in moderate-to-severe cases. **Why other options are incorrect:** * **Option A:** Patients with Crohn’s colitis have a **significantly increased risk** of colorectal cancer, similar to Ulcerative Colitis, especially if the disease involves the colon for >8 years. * **Option C:** While active disease can reduce fertility, the disease itself and certain medications (like Sulfasalazine in men) **can impair fertility**. Surgery-related adhesions in females can also lead to tubal infertility. * **Option D:** Enteroenteric fistulas are often asymptomatic and are **not** an indication for urgent surgery. Surgery is reserved for symptomatic fistulas (e.g., enterovesical, enterocutaneous) or those causing malabsorption. **High-Yield Clinical Pearls for NEET-PG:** * **Pathology:** Characterized by **transmural inflammation**, "skip lesions," and non-caseating granulomas (pathognomonic). * **Surgery:** Never curative (unlike UC). The principle is **bowel conservation** (e.g., Stricturoplasty) to avoid Short Bowel Syndrome. * **Most common site:** Terminal ileum. * **Most common indication for surgery:** Small bowel obstruction (due to strictures). * **Smoking:** A major risk factor that worsens Crohn’s but is protective in Ulcerative Colitis.

Question 552: Duodenal ulcer is most commonly caused by:

A. GERD
B. NSAID therapy
C. Stress ulcer
D. H. pylori (Correct Answer)

Explanation: **Explanation:** The primary etiology of Peptic Ulcer Disease (PUD), specifically duodenal ulcers (DU), is **Helicobacter pylori** infection. It is found in approximately **90-95%** of patients with duodenal ulcers. H. pylori causes hypergastrinemia and increased acid secretion by colonizing the antrum and inhibiting D-cells (which produce somatostatin), leading to the erosion of the duodenal mucosa. **Analysis of Options:** * **H. pylori (Correct):** It is the most common cause worldwide. Eradication of the bacteria significantly reduces the recurrence rate of the ulcer. * **NSAID therapy:** This is the **second most common** cause of PUD. While NSAIDs are more strongly associated with **gastric ulcers** (due to direct mucosal injury and systemic prostaglandin inhibition), they are a less frequent cause of duodenal ulcers compared to H. pylori. * **Stress ulcer:** These are acute mucosal erosions occurring in critically ill patients (e.g., Curling’s ulcer in burns or Cushing’s ulcer in head trauma). They are not the "most common" cause in the general population. * **GERD:** Gastroesophageal Reflux Disease is a consequence of acid reflux into the esophagus; it does not cause duodenal ulcers, though both conditions may coexist due to acid hypersecretion. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Most duodenal ulcers occur in the **first part of the duodenum** (95%), usually within 2 cm of the pylorus. * **Pain Pattern:** DU pain typically occurs 2–3 hours after meals and is **relieved by food** (unlike gastric ulcers, where pain is aggravated by food). * **Investigation of Choice:** Upper GI Endoscopy (UGIE). * **Zollinger-Ellison Syndrome:** Suspect this if ulcers are multiple, distal to the duodenal bulb, or refractory to treatment.

Question 553: What is the best treatment for a refractory peri-anal fistula in Crohn's disease?

A. Fistulectomy
B. Infliximab (Correct Answer)
C. Olasalizine
D. Mesalamine

Explanation: **Explanation:** The management of perianal Crohn’s disease (PCD) is complex and requires a multidisciplinary approach. For **refractory perianal fistulas**, medical therapy with biological agents is the gold standard. **1. Why Infliximab is correct:** Infliximab (a chimeric monoclonal antibody against TNF-α) is the first-line medical treatment for complex or refractory fistulizing Crohn’s disease. It is the only agent proven in randomized controlled trials (ACCENT II study) to be effective in inducing and maintaining the closure of enterocutaneous and perianal fistulas. It works by reducing transmural inflammation, allowing the fistula tract to heal. **2. Why the other options are incorrect:** * **Fistulectomy (A):** In Crohn’s disease, aggressive surgeries like fistulectomy are generally **contraindicated** because the underlying tissue has poor healing capacity. It carries a high risk of non-healing wounds, fecal incontinence, and may eventually necessitate a proctectomy. Surgery in PCD is usually limited to "conservative" measures like seton placement to prevent abscess formation. * **Olasalizine (C) & Mesalamine (D):** These are 5-ASA derivatives. While they are used for maintaining remission in mild-to-moderate luminal ulcerative colitis or Crohn’s, they have **no proven efficacy** in treating fistulizing disease or perianal complications. **NEET-PG High-Yield Pearls:** * **First-line for simple fistula:** Metronidazole or Ciprofloxacin (Antibiotics). * **Best imaging modality:** MRI Pelvis (Gold standard for mapping the fistula tract). * **Surgical goal:** "Drainage, not cure." Use non-cutting setons to maintain patency and prevent recurrent abscesses. * **Combination Therapy:** Combining Infliximab with surgical seton drainage yields better results than either alone.

Question 554: A 60-year-old male presents with a reducible rectal mass that protrudes during defecation and straining. On examination, a full-thickness protrusion through the anus is noted with concentric mucosal folds and a palpable sulcus. He is considered a high anesthetic risk. What is the preferred surgical treatment?

A. Frykman-Goldberg procedure
B. Well's procedure
C. Delorme procedure (Correct Answer)
D. Ripstein procedure

Explanation: ***Delorme procedure*** - **Perineal approach** ideal for **high anesthetic risk** patients as it avoids general anesthesia and abdominal surgery complications. - Involves **mucosal stripping** and **muscle plication** through the anus, making it safer for elderly or frail patients with **complete rectal prolapse**. *Frykman-Goldberg procedure* - **Abdominal approach** requiring **general anesthesia** and laparotomy, unsuitable for high-risk patients. - Combines **posterior mesh fixation** with **sigmoid resection**, carrying higher perioperative risks. *Well's procedure* - **Transabdominal approach** with **anterior sling** and **sigmoid resection**, requiring general anesthesia. - Higher morbidity and mortality risk compared to perineal procedures in **elderly high-risk** patients. *Ripstein procedure* - **Abdominal approach** using **posterior mesh wrap** around the rectum, requiring general anesthesia. - Risk of **mesh erosion** and **constipation** due to rectal constriction, plus unsuitable for high anesthetic risk patients.

Question 555: What is meant by the Mc stages of colon cancer?

A. Hepatic metastasis.
B. Extension up to serosa and lymph node involvement. (Correct Answer)
C. Extension up to serosa.
D. Extension up to mucosa.

Explanation: The **Mc stages** (specifically **McVay’s modification** of the Dukes classification) are historical but high-yield staging systems used to describe the anatomical spread of colorectal carcinoma. ### **Explanation of the Correct Answer** The correct answer is **B**. In the evolution of colorectal cancer staging, the Dukes classification was modified by several surgeons (Kirklin, Astler-Coller, and McVay). According to the McVay staging: * **Stage 1:** Growth limited to the mucosa. * **Stage 2:** Growth extending into the muscularis propria. * **Stage 3:** Extension up to the **serosa**. * **Stage 4:** Involvement of **regional lymph nodes**. Therefore, the term "Mc stages" in this context refers to the progression involving both the depth of wall penetration (serosa) and the presence of nodal metastasis. ### **Analysis of Incorrect Options** * **Option A (Hepatic metastasis):** This represents Stage D in the Dukes/Astler-Coller system or M1 in TNM staging, but it is not the defining feature of the "Mc stages" progression. * **Option C (Extension up to serosa):** This describes a T3 lesion or Stage 3 in McVay’s system, but it is incomplete as the classification specifically emphasizes the transition to nodal involvement. * **Option D (Extension up to mucosa):** This describes Stage 1 (early-stage disease) and does not represent the comprehensive scope of the staging system. ### **NEET-PG High-Yield Pearls** * **Dukes Classification:** Original Dukes A (limited to wall), B (through wall), C (lymph nodes). * **Astler-Coller Modification:** The most commonly cited modification; it split stages based on whether the serosa was penetrated (B1 vs. B2) and whether nodes were positive (C1 vs. C2). * **Gold Standard:** Modern practice has shifted entirely to the **AJCC TNM Staging**, but historical names like Dukes and McVay are frequently tested in PG entrance exams to assess knowledge of surgical history.

Question 556: A 30-year-old female presents with progressive dysphagia for both solids and liquids, and heartburn. The symptoms have been worsening over the past few months, accompanied by a significant weight loss of 6 kg in 2 months. Barium swallow revealed a bird beak deformity. What is the most likely diagnosis?

A. Achalasia due to atrophy and sclerosis of the distal two thirds of the esophagus
B. Achalasia due to non-relaxing lower esophageal sphincter (Correct Answer)
C. Esophageal stricture due to chronic acid reflux
D. Esophageal spasm

Explanation: ### Explanation **Correct Option: B. Achalasia due to non-relaxing lower esophageal sphincter** **Why it is correct:** The clinical triad of **progressive dysphagia (to both solids and liquids)**, weight loss, and the classic **"Bird-beak" appearance** on barium swallow is pathognomonic for **Achalasia Cardia**. The underlying pathophysiology involves the failure of the Lower Esophageal Sphincter (LES) to relax during swallowing and the absence of peristalsis in the distal esophagus. This is caused by the degeneration of the **myenteric (Auerbach’s) plexus**, leading to a loss of inhibitory neurons (nitric oxide and VIP). While heartburn is typically associated with GERD, it is a common paradoxical symptom in achalasia due to the fermentation of retained food in the esophagus (lactic acid production). **Why other options are incorrect:** * **Option A:** This description (atrophy and sclerosis) refers to **Scleroderma (Systemic Sclerosis)**. While it causes dysphagia, the LES in scleroderma is typically **hypotensive** (low pressure), leading to severe GERD, unlike the hypertensive/non-relaxing LES in achalasia. * **Option C:** Esophageal strictures usually present with dysphagia primarily for **solids** initially, and the barium swallow would show a fixed narrowing rather than the smooth, tapering "bird-beak" deformity. * **Option D:** Esophageal spasm (e.g., Diffuse Esophageal Spasm) presents with intermittent chest pain and a **"Corkscrew esophagus"** on barium swallow, not a bird-beak deformity. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Esophageal **Manometry** (shows incomplete LES relaxation and aperistalsis). * **Investigation of Choice (Initial):** Barium Swallow. * **Treatment of Choice:** Laparoscopic **Heller’s Myotomy** with partial fundoplication (Dor or Toupet). * **POEM (Per-Oral Endoscopic Myotomy):** A newer, minimally invasive endoscopic treatment. * **Complication:** Long-standing achalasia increases the risk of **Squamous Cell Carcinoma** of the esophagus.

Question 557: Which of the following veins is NOT involved in the formation of gastric varices?

A. Coronary vein
B. Right gastroepiploic vein
C. Short gastric vein
D. Splenic vein (Correct Answer)

Explanation: **Explanation:** The formation of gastric varices is primarily a consequence of **portal hypertension** or **isolated splenic vein thrombosis**. The key to this question lies in distinguishing between the **tributaries** that carry blood to the stomach wall and the **main trunks** that are obstructed. **Why the Splenic Vein is the correct answer:** The **Splenic vein** is a major vessel of the portal system. While its obstruction (e.g., in chronic pancreatitis) *causes* gastric varices by forcing blood into collateral pathways, the vein itself does not form the variceal plexus within the gastric wall. Gastric varices are formed by the **dilation of smaller collateral tributaries** that bypass the high-pressure system to reach the systemic circulation. **Analysis of Incorrect Options:** * **Coronary Vein (Left Gastric Vein):** This is the most common source of both esophageal and gastric varices (Type GOV1). It drains the lesser curvature and forms a portosystemic shunt with the azygos system. * **Short Gastric Veins:** These are the primary vessels involved in **isolated gastric varices (IGV)**. When the splenic vein is blocked, blood shunts through the short gastrics toward the gastric fundus to reach the portal system via the left gastric vein. * **Right Gastroepiploic Vein:** This vein drains the greater curvature. In cases of portal hypertension or distal venous obstruction, it can contribute to the formation of varices along the lower body of the stomach. **NEET-PG High-Yield Pearls:** * **Sarin’s Classification:** The most widely used system for gastric varices. **GOV1** (extension of esophageal varices along lesser curve) is the most common. * **Isolated Gastric Varices (IGV1):** Located in the fundus; highly suggestive of **Splenic Vein Thrombosis** (often due to pancreatitis). * **Treatment of Choice:** For bleeding gastric varices, **Endoscopic Cyanoacrylate injection** is preferred over band ligation. * **Sinusoidal vs. Pre-sinusoidal:** Splenic vein thrombosis is a classic cause of **pre-hepatic** portal hypertension.

Question 558: Common sites for Cushing ulcers include all of the following except?

A. Esophagus
B. Stomach
C. First part of duodenum
D. Distal duodenum (Correct Answer)

Explanation: **Explanation:** **Cushing ulcers** are stress-induced gastrointestinal ulcers specifically associated with **increased intracranial pressure (ICP)**, head trauma, or brain surgery. The underlying pathophysiology involves the stimulation of the **vagus nerve** nuclei due to elevated ICP. This leads to hypersecretion of gastric acid (HCl) via increased acetylcholine release, which overwhelms the mucosal defenses. Unlike Curling ulcers (associated with burns), which are typically found in the duodenum, Cushing ulcers are more prone to **perforation** and can occur at multiple levels of the upper gastrointestinal tract. **Analysis of Options:** * **Distal Duodenum (Correct Answer):** Cushing ulcers typically involve the **Esophagus, Stomach, and the First part of the Duodenum**. They rarely, if ever, extend to the distal (third or fourth) parts of the duodenum. * **Esophagus (Incorrect):** This is a recognized site for Cushing ulcers due to the high acid reflux and vagal overstimulation. * **Stomach (Incorrect):** The stomach is the most common site for these ulcers. * **First part of Duodenum (Incorrect):** This is a frequent site for stress-related ulceration, similar to peptic ulcer disease. **High-Yield Clinical Pearls for NEET-PG:** * **Cushing vs. Curling:** Remember **C**ushing = **C**NS (Brain) and **C**urling = **C**ooked (Burns). * **Pathogenesis:** Cushing ulcers are caused by **hyperacidity** (vagal stimulation), whereas Curling ulcers are primarily due to **mucosal ischemia** (hypovolemia). * **Morphology:** Cushing ulcers are often deep and have a higher incidence of perforation compared to other stress ulcers. * **Prophylaxis:** Proton Pump Inhibitors (PPIs) or H2 blockers are standard in ICU settings to prevent these complications.

Question 559: What is the primary risk associated with acute mechanical large bowel obstruction that necessitates early surgical intervention?

A. Respiratory compromise secondary to abdominal distension
B. Fluid and electrolyte derangements resulting from vomiting
C. Bacteremia or sepsis originating from intestinal contents
D. Development of a closed-loop obstruction leading to cecal perforation (Correct Answer)

Explanation: ### Explanation The primary risk in acute mechanical large bowel obstruction (LBO) is the development of a **closed-loop obstruction**, specifically when the **ileocecal valve is competent** (found in approximately 80% of patients). In this scenario, gas and fluid are trapped between the obstructing lesion (e.g., sigmoid colon cancer) and the functional ileocecal valve. According to **Laplace’s Law** ($Pressure = Tension / Radius$), the cecum, having the largest diameter in the colon, experiences the highest wall tension. As intraluminal pressure rises, capillary perfusion is compromised, leading to ischemia, gangrene, and eventually **cecal perforation**. A cecal diameter >10–12 cm on imaging is a surgical emergency. **Analysis of Incorrect Options:** * **Option A:** While massive distension can elevate the diaphragm and cause respiratory distress, it is rarely the immediate life-threatening event compared to bowel necrosis. * **Option B:** Unlike small bowel obstruction, vomiting is a late feature in LBO. Fluid shifts occur, but they are generally less rapid than in proximal obstructions. * **Option C:** Bacteremia and sepsis are *consequences* of ischemia or perforation, but the primary mechanical risk driving the need for early surgery is the closed-loop phenomenon itself. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of LBO:** Colorectal Cancer (followed by Diverticulitis and Volvulus). * **Ogilvie Syndrome:** Pseudo-obstruction (massive colonic dilation without mechanical blockage); managed initially with neostigmine. * **X-ray finding:** Peripheral distribution of bowel loops with haustral markings (which do not cross the entire lumen, unlike *valvulae conniventes*). * **Bird’s Beak Sign:** Classic radiological sign for sigmoid volvulus on contrast enema.

Question 560: Which type of malignancy is most commonly associated with an anorectal fistula?

A. Squamous cell carcinoma (Correct Answer)
B. Transitional cell carcinoma
C. Adenocarcinoma
D. Columnar cell carcinoma

Explanation: **Explanation:** The association between anorectal fistulae and malignancy typically occurs in the context of **long-standing, chronic fistulae-in-ano**. While adenocarcinoma is the most common primary cancer of the rectum, **Squamous Cell Carcinoma (SCC)** is the most common malignancy arising directly within a chronic anal fistula tract. 1. **Why Squamous Cell Carcinoma is correct:** Chronic irritation and persistent inflammation of the epithelial lining of the fistula tract lead to **squamous metaplasia**. Over years (often decades), this metaplastic epithelium undergoes malignant transformation into Squamous Cell Carcinoma. This follows the general pathological principle that chronic inflammation in squamous-lined or metaplastic areas predisposes to SCC (similar to Marjolin’s ulcer). 2. **Why other options are incorrect:** * **Adenocarcinoma:** While primary rectal cancers are adenocarcinomas, they rarely arise *from* a fistula tract. When adenocarcinoma is found in a fistula, it is usually a primary rectal cancer spreading downward or arising from the anal glands (mucinous type), rather than the tract itself. * **Transitional cell carcinoma:** This is characteristic of the urinary tract (urothelium) and is not found in the anorectal canal. * **Columnar cell carcinoma:** This is essentially a subtype of adenocarcinoma; it is not the standard terminology for cancers arising from chronic fistula tracts. **Clinical Pearls for NEET-PG:** * **The "10-year Rule":** Malignant transformation usually occurs in fistulae present for more than 10 years. * **Red Flags:** Sudden change in discharge (bloody/foul-smelling), a palpable hard mass, or non-healing despite surgery in a known fistula patient should raise suspicion of SCC. * **Colloid/Mucinous Carcinoma:** If a malignancy arises from the **anal glands** (the origin of the fistula), it is more likely to be a mucinous adenocarcinoma. However, for the **fistula tract** itself, SCC remains the most common answer.

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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