Gastrointestinal Surgery — MCQs

A patient with Crohn's Disease underwent resection and anastomosis. On the 7th post-operative day, the patient presents with an anastomotic site leak from a fistula, with a daily leakage volume of 150-200 ml. There is no intra-abdominal collection, and the patient is hemodynamically stable and asymptomatic. What is the next line of management?

Q616Medium

A 50-year-old male presents with occasional dysphagia for solids, regurgitation of food, and foul-smelling breath. What is the probable diagnosis?

Q617Medium

A 60-year-old man presents with acute onset of pain in the lower abdomen, followed by repeated rectal bleeding. Examination reveals a pulse rate of 100/minute, BP 160/96 mm Hg, and localized tenderness in the left hypochondrium. Stool examination reveals only a few pus cells, and sigmoidoscopy was normal. Which one of the following is the most likely diagnosis?

Q618Medium

A 60-year-old woman with a history of duodenal ulcer disease presents with anorexia, nausea, weight loss, and recurrent vomiting of undigested food over the past 6 months. Examination reveals dehydration, hypokalemia, and hypochloremic alkalosis. What is the most likely diagnosis?

Q619Easy

Heller myotomy is used in which of the following conditions?

Q620Easy

All are features of viable bowel, except?

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 611: Which incision is preferred for appendectomy for better cosmetic approach?

A. Rutherford Morrison incision
B. Lanz incision (Correct Answer)
C. McBurney incision
D. Pfannenstiel incision

Explanation: The correct answer is **B. Lanz incision**. ### **Explanation** The **Lanz incision** is a transverse skin incision made approximately 2 cm below the umbilicus, centered on the mid-clavicular-midthalamic line. It is the preferred choice for appendectomy when cosmesis is a priority because it follows **Langer’s lines** (natural skin tension lines). By placing the scar parallel to these lines, the wound heals with minimal tension, resulting in a thinner, less noticeable scar that can often be hidden by swimwear or undergarments. ### **Analysis of Incorrect Options** * **McBurney incision (Gridiron):** This is a classic oblique incision made at the McBurney point (one-third the distance from the ASIS to the umbilicus). While it provides excellent access, it crosses Langer’s lines, often resulting in a wider, more prominent scar. * **Rutherford Morrison incision:** This is an extension of the McBurney incision (oblique/muscle-cutting). It is used for difficult, retrocecal appendices or to gain extra exposure; it is not chosen for cosmetic reasons. * **Pfannenstiel incision:** This is a low transverse "bikini-line" incision primarily used for pelvic surgeries (e.g., Cesarean sections or cystectomies). It does not provide direct access to the appendix. ### **High-Yield Clinical Pearls for NEET-PG** * **Muscle-Splitting:** Both McBurney and Lanz incisions are "muscle-splitting" (gridiron) techniques, meaning they split the external oblique, internal oblique, and transversus abdominis muscles in the direction of their fibers rather than cutting them. * **Langer’s Lines:** Always remember that any incision parallel to these lines yields the best cosmetic result. * **Laparoscopic Appendectomy:** Currently, the laparoscopic approach is increasingly preferred over open incisions (like Lanz) for even better cosmetic outcomes and faster recovery.

Question 612: A 24-year-old male presents with a 15-day history of fever, followed by acute abdominal pain and distension. Examination reveals generalized tenderness with guarding. What is the most likely diagnosis?

A. Acute appendicitis
B. Acute pancreatitis
C. Enteric perforation (Correct Answer)
D. Duodenal ulcer perforation

Explanation: ### Explanation The clinical presentation of **fever preceding acute abdominal pain** in a young patient is a classic hallmark of **Enteric (Typhoid) Perforation**. **1. Why Enteric Perforation is Correct:** In the natural history of Typhoid fever (caused by *Salmonella typhi*), the bacteria colonize the **Peyer's patches** in the terminal ileum. During the **third week** (14–21 days) of the illness, these patches undergo necrosis, leading to longitudinal ulcers that can perforate. This results in sudden-onset secondary peritonitis, characterized by the generalized tenderness, guarding, and distension seen in this patient. **2. Why Other Options are Incorrect:** * **Acute Appendicitis:** While common in young adults, it typically begins with periumbilical pain migrating to the right iliac fossa. Fever is usually low-grade and occurs *after* the onset of pain, not 15 days prior. * **Acute Pancreatitis:** This usually presents with severe epigastric pain radiating to the back, often associated with gallstones or alcohol intake. Prolonged fever is not a typical prodrome. * **Duodenal Ulcer (DU) Perforation:** This presents with sudden, "board-like" rigidity. While it causes pneumoperitoneum, it lacks the 2-week prodromal febrile illness characteristic of enteric fever. **3. High-Yield Clinical Pearls for NEET-PG:** * **Timing:** Perforation typically occurs in the **3rd week** of typhoid fever. * **Site:** Most common site is the **terminal ileum** (within 60 cm of the ileocaecal valve). * **X-ray:** "Gas under the diaphragm" is seen in 70–80% of cases. * **Management:** The treatment of choice is **primary closure** (if single perforation and minimal contamination) or **resection and anastomosis/ileostomy** (if multiple perforations or severe fecal peritonitis). * **Drug of Choice:** Ceftriaxone is currently preferred due to widespread resistance to older drugs like Chloramphenicol.

Question 613: What is true about carcinoma of the esophagus?

A. The most common site is the lower end.
B. Both adenocarcinoma and squamous cell carcinoma occur. (Correct Answer)
C. The commonest histology is adenocarcinoma.
D. It is more common in females.

Explanation: **Explanation:** Carcinoma of the esophagus is a significant topic in surgical oncology, characterized by two distinct histological types with different risk factors and geographical distributions. **1. Why Option B is Correct:** The esophagus can give rise to both **Squamous Cell Carcinoma (SCC)** and **Adenocarcinoma (AC)**. SCC typically arises from the stratified squamous epithelium lining the upper and middle thirds, often associated with smoking and alcohol. AC arises from glandular metaplasia (Barrett’s esophagus) in the lower third, primarily due to chronic gastroesophageal reflux disease (GERD) and obesity. **2. Why Other Options are Incorrect:** * **Option A & C:** Globally and historically, **Squamous Cell Carcinoma** is the most common histological type and the **middle third** is the most common site. While Adenocarcinoma is increasing in incidence in Western countries and involves the lower end, SCC remains the dominant type worldwide and in the Indian subcontinent. * **Option D:** Esophageal cancer shows a strong **male predominance** (approximately 3:1 to 4:1 ratio), largely due to higher rates of smoking, alcohol consumption, and visceral obesity among men. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site (Worldwide/India):** Middle third (SCC). * **Most common site (Western world/Recent trend):** Lower third (Adenocarcinoma). * **Investigation of Choice:** Upper GI Endoscopy with biopsy. * **Staging Investigation:** Contrast-Enhanced CT (CECT) for distant metastasis; Endoscopic Ultrasound (EUS) is the most sensitive for 'T' and 'N' staging. * **Plummer-Vinson Syndrome:** Predisposes to SCC in the post-cricoid region (upper esophagus). * **Tylosis (Palmar-plantar keratoderma):** An autosomal dominant condition with a near 100% lifetime risk of SCC.

Question 614: Which of the following causes the least irritation to the peritoneal cavity?

A. Bile
B. Blood (Correct Answer)
C. Pancreatic enzymes
D. Gastric juice

Explanation: The severity of peritonitis depends on the pH, chemical composition, and bacterial load of the fluid entering the peritoneal cavity. **Explanation of the Correct Answer:** **Blood (Option B)** is the least irritating substance to the peritoneum. While blood acts as an excellent culture medium for bacteria (increasing the risk of delayed sepsis), it is chemically neutral and does not cause significant immediate chemical inflammation. Patients with a hemoperitoneum (e.g., ruptured ectopic pregnancy or splenic trauma) often present with surprisingly mild abdominal tenderness compared to those with hollow viscus perforation. **Analysis of Incorrect Options:** * **Gastric Juice (Option D):** This is the **most irritating** substance due to its extremely low pH (acidic). A perforated peptic ulcer causes immediate, intense "board-like" rigidity and agonizing pain (chemical peritonitis). * **Pancreatic Enzymes (Option C):** These are highly caustic. In acute pancreatitis, the release of activated trypsin and lipase leads to severe chemical fat necrosis and profound systemic inflammatory response. * **Bile (Option A):** Bile is highly irritating and causes intense chemical peritonitis. While sterile bile is less toxic than infected bile, it still causes significant fluid shifts and pain. **NEET-PG High-Yield Pearls:** 1. **Hierarchy of Peritoneal Irritation:** Gastric juice > Pancreatic juice > Bile > Urine > Blood. 2. **Clinical Sign:** The "Board-like rigidity" is most characteristic of perforated peptic ulcers (Gastric juice). 3. **Pneumoperitoneum:** While gastric juice is the most irritating, the presence of free air under the diaphragm is the classic radiological sign of hollow viscus perforation. 4. **Bacterial Peritonitis:** While blood is least irritating initially, it has the highest risk of secondary infection if bacteria are introduced.

Question 615: A patient with Crohn's Disease underwent resection and anastomosis. On the 7th post-operative day, the patient presents with an anastomotic site leak from a fistula, with a daily leakage volume of 150-200 ml. There is no intra-abdominal collection, and the patient is hemodynamically stable and asymptomatic. What is the next line of management?

A. Conservative management with observation for spontaneous resolution (Correct Answer)
B. Laparotomy to identify the leakage site and assess margin health
C. Laparotomy with complete exteriorization of the fistula
D. Laparotomy with placement of lateral drains

Explanation: ### Explanation The management of a post-operative enterocutaneous fistula (ECF) depends on the patient's clinical stability, the output volume, and the presence of sepsis. **1. Why Option A is Correct:** The patient is **hemodynamically stable, asymptomatic, and has no intra-abdominal collection** (sepsis is controlled). Furthermore, the fistula is **low-output** (<200 ml/day). In such cases, the standard of care is conservative management. This involves nutritional support (TPN or distal enteral feeding), skin care, and monitoring. Spontaneous closure is highly likely (up to 70-80%) in low-output fistulae without distal obstruction or active Crohn’s at the site. **2. Why the Other Options are Incorrect:** * **Options B, C, and D:** Immediate laparotomy is contraindicated in a stable patient. Re-operating during the "obliterative peritonitis" phase (usually 1–6 weeks post-op) is technically difficult due to dense adhesions and high risk of creating new bowel injuries. Surgery is only indicated if there is uncontrolled sepsis, generalized peritonitis, or if the fistula fails to close after 3–6 months of conservative therapy. **3. Clinical Pearls for NEET-PG:** * **Classification by Output:** Low-output (<200 ml/day), Moderate (200–500 ml/day), High-output (>500 ml/day). High-output fistulae are less likely to close spontaneously. * **SNAP Protocol for ECF:** **S**epsis control, **N**utrition, **A**natomy definition (imaging), and **P**lan (conservative vs. surgical). * **FRIEND Mnemonic (Factors preventing spontaneous closure):** **F**oreign body, **R**adiation, **I**nflammation/Infection (IBD), **E**pithelialization of the tract, **N**eoplasm, **D**istal obstruction. * **Crohn’s Specific:** While Crohn’s increases the risk of fistulae, a post-operative leak is often a technical/ischemic issue rather than active disease, justifying an initial conservative trial.

Question 616: A 50-year-old male presents with occasional dysphagia for solids, regurgitation of food, and foul-smelling breath. What is the probable diagnosis?

A. Achalasia cardia
B. Zenker's diverticulum (Correct Answer)
C. Carcinoma esophagus
D. Diabetic gastroparesis

Explanation: ### Explanation **Correct Option: B. Zenker's Diverticulum** The clinical triad of **dysphagia, regurgitation of undigested food, and halitosis (foul-smelling breath)** is classic for Zenker’s diverticulum. This is a **pulsion pseudodiverticulum** (consisting of mucosa and submucosa only) that occurs through **Killian’s dehiscence**, a weak area between the thyropharyngeus and cricopharyngeus muscles. The foul breath is caused by the fermentation of food trapped within the diverticulum pouch. **Analysis of Incorrect Options:** * **A. Achalasia Cardia:** Characterized by dysphagia for both solids and liquids from the onset. While regurgitation occurs, halitosis is less common than in Zenker’s, and the pathology lies at the Lower Esophageal Sphincter (LES), not the pharyngoesophageal junction. * **C. Carcinoma Esophagus:** Typically presents with progressive dysphagia (solids then liquids) and significant weight loss in an older patient. While it can cause halitosis due to tumor necrosis, the regurgitation of undigested food is more specific to a proximal pouch. * **D. Diabetic Gastroparesis:** Presents with early satiety, bloating, and vomiting of food eaten several hours prior, but it does not typically cause dysphagia. **NEET-PG High-Yield Pearls:** * **Investigation of Choice:** Barium Swallow (shows a "pouch" behind the esophagus). * **Management:** Small/Asymptomatic: Observation; Large/Symptomatic: **Dohlman’s Procedure** (Endoscopic stapling/diverticulotomy) or open diverticulectomy with cricopharyngeal myotomy. * **Risk:** Endoscopy is generally avoided if Zenker’s is suspected due to the high risk of **iatrogenic perforation**.

Question 617: A 60-year-old man presents with acute onset of pain in the lower abdomen, followed by repeated rectal bleeding. Examination reveals a pulse rate of 100/minute, BP 160/96 mm Hg, and localized tenderness in the left hypochondrium. Stool examination reveals only a few pus cells, and sigmoidoscopy was normal. Which one of the following is the most likely diagnosis?

A. Idiopathic ulcerative colitis
B. Bacillary dysentery
C. Ischaemic colitis (Correct Answer)
D. Amoebic colitis

Explanation: ### Explanation **Correct Answer: C. Ischaemic colitis** **Why it is correct:** Ischaemic colitis typically presents in elderly patients (like this 60-year-old) with a classic triad: **acute abdominal pain**, followed by **hematochezia** (rectal bleeding), and **localized tenderness**, most commonly at the **Splenic Flexure** (Griffith’s point) or the rectosigmoid junction (Sudek’s point). These are "watershed areas" with limited collateral circulation. * **Clinical Clues:** The patient is hypertensive (BP 160/96), suggesting underlying atherosclerosis, a major risk factor. * **Diagnostic Clue:** A **normal sigmoidoscopy** is a hallmark finding when the ischemia is localized to the splenic flexure (left hypochondrium), as the rectum is usually spared due to its dual blood supply from the systemic and portal systems. **Why incorrect options are wrong:** * **Idiopathic Ulcerative Colitis:** Usually presents in younger patients with chronic, mucoid bloody diarrhea and tenesmus. Sigmoidoscopy would almost always show continuous rectal involvement (proctitis), which is absent here. * **Bacillary Dysentery:** Presents with high-grade fever, severe abdominal cramps, and stool microscopy showing numerous pus cells and RBCs. This patient has only "a few" pus cells and is hemodynamically stable. * **Amoebic Colitis:** Characterized by a more subacute onset, "anchovy sauce" stools (in liver involvement), or flask-shaped ulcers. Sigmoidoscopy typically reveals focal ulcers with intervening normal mucosa in the cecum or rectum. **High-Yield Pearls for NEET-PG:** 1. **Most common site:** Splenic flexure (Griffith’s point) – junction of SMA and IMA territories. 2. **Radiology:** "Thumbprinting" on plain X-ray or CT due to submucosal edema/hemorrhage. 3. **Management:** Most cases are transient and managed conservatively with IV fluids and antibiotics; surgery is reserved for gangrenous changes. 4. **Rectal Sparing:** Unlike Ulcerative Colitis, the rectum is typically spared in Ischaemic Colitis.

Question 618: A 60-year-old woman with a history of duodenal ulcer disease presents with anorexia, nausea, weight loss, and recurrent vomiting of undigested food over the past 6 months. Examination reveals dehydration, hypokalemia, and hypochloremic alkalosis. What is the most likely diagnosis?

A. Carcinoma of the gastric fundus
B. Penetrating ulcer
C. Pyloric obstruction due to cicatricial stenosis of the duodenum (Correct Answer)
D. Zollinger-Ellison Syndrome

Explanation: ### Explanation The clinical presentation of **recurrent vomiting of undigested food**, weight loss, and a history of duodenal ulcer disease strongly points toward **Gastric Outlet Obstruction (GOO)**. In this case, the underlying cause is **cicatricial stenosis** (scarring) of the duodenum resulting from chronic ulceration. #### Why Option C is Correct: Chronic duodenal ulcers lead to inflammation and subsequent fibrosis (cicatrization). This narrows the pyloric canal or the first part of the duodenum, preventing gastric emptying. The hallmark metabolic derangement in GOO is **Paradoxical Aciduria** within the context of **Hypochloremic, Hypokalemic, Metabolic Alkalosis**. This occurs because the loss of gastric HCl through vomiting leads to alkalosis; the kidneys then attempt to conserve sodium and water (due to dehydration) by exchanging $H^+$ and $K^+$ ions, leading to acidic urine despite systemic alkalosis. #### Why Other Options are Incorrect: * **A. Carcinoma of the gastric fundus:** While malignancy causes weight loss, fundal tumors typically present with dysphagia or anemia rather than gastric outlet obstruction. GOO in malignancy is usually due to antral or pyloric tumors. * **B. Penetrating ulcer:** This typically presents with constant, severe back pain (often involving the pancreas) rather than obstructive vomiting. * **D. Zollinger-Ellison Syndrome:** While it causes severe ulceration, it usually presents with refractory ulcers and diarrhea (due to lipase inactivation by acid) rather than mechanical obstruction. #### High-Yield Clinical Pearls for NEET-PG: * **Succession Splash:** A classic physical sign heard over the epigastrium 3+ hours after a meal, indicating retained gastric contents. * **Metabolic Profile:** Hypochloremic, hypokalemic, metabolic alkalosis with **paradoxical aciduria**. * **Initial Management:** Nasogastric decompression, correction of dehydration with **0.9% Normal Saline** (to provide $Cl^-$), and potassium supplementation. * **Surgery of Choice:** Historically, Truncal Vagotomy and Gastrojejunostomy or Antrectomy.

Question 619: Heller myotomy is used in which of the following conditions?

A. Esophageal atresia
B. Achalasia (Correct Answer)
C. Gastroesophageal reflux disease (GERD)
D. None of the above

Explanation: **Heller Myotomy** is the surgical procedure of choice for **Achalasia Cardia**. ### Why Achalasia is Correct Achalasia is a primary esophageal motility disorder characterized by the failure of the Lower Esophageal Sphincter (LES) to relax and the absence of peristalsis in the distal esophagus. This is due to the degeneration of the myenteric (Auerbach’s) plexus. **Heller Myotomy** involves performing a longitudinal incision through the muscular layers (circular and longitudinal) of the distal esophagus and the proximal stomach. By cutting these muscle fibers, the resting pressure of the LES is reduced, allowing food to pass into the stomach by gravity. ### Why Other Options are Incorrect * **Esophageal Atresia:** This is a congenital anatomical defect where the esophagus ends in a blind pouch. Treatment requires primary anastomosis of the esophageal ends, not a myotomy. * **GERD:** Heller myotomy actually *causes* reflux by destroying the LES barrier. GERD is typically treated with **Fundoplication** (e.g., Nissen or Toupet) to strengthen the sphincter, not weaken it. ### NEET-PG High-Yield Pearls * **Modified Heller Myotomy:** Today, it is usually performed laparoscopically and combined with a **partial fundoplication** (Dor or Toupet) to prevent postoperative gastroesophageal reflux. * **Gold Standard Diagnosis:** While "Bird’s beak" appearance is seen on Barium swallow, **Esophageal Manometry** is the gold standard for diagnosing Achalasia. * **POEM:** Per-Oral Endoscopic Myotomy is a newer, "scarless" endoscopic alternative to the surgical Heller myotomy. * **Complication:** The most significant long-term risk of untreated or treated Achalasia is **Squamous Cell Carcinoma** of the esophagus.

Question 620: All are features of viable bowel, except?

A. Vascularity
B. Musculature
C. Presence of food (Correct Answer)
D. Shiny peritoneum

Explanation: In gastrointestinal surgery, assessing bowel viability is a critical intraoperative decision, especially in cases of strangulated hernias, volvulus, or mesenteric ischemia. The viability of the bowel is determined by its physiological and anatomical integrity, not its contents. ### **Explanation of Options** * **Correct Answer (C) Presence of food:** The presence of food or fecal matter within the lumen is entirely independent of the health of the bowel wall. A necrotic, gangrenous segment of bowel can still contain food, just as a healthy segment can be empty. Therefore, it is not a criterion for viability. * **A. Vascularity:** This is the most crucial indicator. Viable bowel must have active arterial pulsations in the mesentery and show active bleeding from the cut edges. * **B. Musculature:** A viable bowel exhibits **peristalsis**. If the muscle layer is healthy, the bowel will contract when stimulated (mechanically or thermally). Loss of contractility indicates ischemia. * **D. Shiny peritoneum:** Healthy bowel has a glistening, smooth, and pinkish-red serosal surface. A non-viable bowel appears dull, black/green, or gray, indicating loss of peritoneal integrity. ### **Clinical Pearls for NEET-PG** * **Standard Criteria for Viability:** The "Triple Test" includes **Color** (Pink/Red), **Contractions** (Peristalsis), and **Circulation** (Pulsations). * **Management of Doubtful Viability:** If viability is uncertain, the bowel should be wrapped in warm, moist packs for 10–15 minutes and re-evaluated. * **Gold Standard:** While clinical judgment is standard, **Fluorescein dye** (under Wood’s lamp) or **Doppler ultrasound** can be used for objective assessment of blood flow. * **High-Yield Fact:** The first layer of the bowel wall to undergo necrosis during ischemia is the **Mucosa**, as it is the most metabolically active.

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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