Gastrointestinal Surgery — MCQs
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What is the most common cause of mediastinitis?
A 25-year-old man presents to the emergency room with severe abdominal pain. Guaiac test on stool demonstrates occult blood. The patient undergoes exploratory laparotomy, revealing a small area of infarcted small bowel, which is surgically removed. Histologic studies on the removed section of bowel demonstrate a recent thrombus occluding a small muscular artery. The adjacent vessel wall shows fibrinoid necrosis with a mixed inflammatory infiltrate containing neutrophils, eosinophils, and mononuclear cells. Which of the following is the most likely cause of the small bowel infarction?
Dumping syndrome is characterized by all of the following except?
After subtotal colectomy for toxic megacolon in Crohn's disease, which surgical option is associated with the lowest recurrence rate?
What is the commonest cause of mortality in liver transplant operations?
Which of the following is NOT true about Boerhaave's syndrome?
Which one of the following reagents is not used as a sclerosant in the treatment of bleeding varices?
The management of adenocarcinoma of the small intestine depends primarily on tumour location. Which of the following statements concerning surgical management is true?
In Peutz-Jeghers syndrome, where are polyps mainly found?
What is the treatment of choice for Hinchey Grade 2 diverticulitis?
Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs
Question 821: What is the most common cause of mediastinitis?
- A. Tracheal rupture
- B. Esophageal rupture (Correct Answer)
- C. Drugs
- D. Idiopathic
Explanation: **Explanation:** **Mediastinitis** is a life-threatening inflammatory condition of the mediastinum, most commonly caused by an infection. **Why Esophageal Rupture is Correct:** Esophageal perforation (rupture) is the **most common cause** of acute mediastinitis. The esophagus lacks a serosal layer, allowing luminal contents (saliva, gastric acid, and bacteria) to leak directly into the mediastinal space. This leads to rapid chemical irritation followed by polymicrobial infection. The most frequent mechanism is **iatrogenic** (e.g., during endoscopy or dilatation), followed by **Boerhaave syndrome** (effort rupture due to forceful vomiting). **Analysis of Incorrect Options:** * **Tracheal rupture:** While it can cause pneumomediastinum, it is a much rarer cause of fulminant mediastinitis compared to the esophagus, as the airway is relatively sterile compared to the GI tract. * **Drugs:** Certain drugs (like bisphosphonates or NSAIDs) can cause "pill esophagitis," but they rarely lead to full-thickness rupture and subsequent mediastinitis. * **Idiopathic:** Most cases of mediastinitis have a clear identifiable cause, such as trauma, surgery, or descending odontogenic infections. **High-Yield Clinical Pearls for NEET-PG:** * **Mackler’s Triad (Boerhaave Syndrome):** Vomiting, chest pain, and subcutaneous emphysema. * **Hamman’s Sign:** A crunching sound heard over the precordium synchronous with the heartbeat, indicative of pneumomediastinum. * **Descending Necrotizing Mediastinitis:** A severe form arising from oropharyngeal/odontogenic infections (e.g., Ludwig’s angina) spreading via the "danger space" (retrovisceral space). * **Imaging:** Contrast esophagogram (using Gastrografin initially) is the gold standard for diagnosing esophageal rupture.
Question 822: A 25-year-old man presents to the emergency room with severe abdominal pain. Guaiac test on stool demonstrates occult blood. The patient undergoes exploratory laparotomy, revealing a small area of infarcted small bowel, which is surgically removed. Histologic studies on the removed section of bowel demonstrate a recent thrombus occluding a small muscular artery. The adjacent vessel wall shows fibrinoid necrosis with a mixed inflammatory infiltrate containing neutrophils, eosinophils, and mononuclear cells. Which of the following is the most likely cause of the small bowel infarction?
- A. Atherosclerosis
- B. Cystic medial necrosis
- C. Monckeberg's arteriosclerosis
- D. Polyarteritis nodosa (Correct Answer)
Explanation: **Explanation:** The clinical presentation and histopathology point toward **Polyarteritis Nodosa (PAN)**. PAN is a systemic necrotizing vasculitis that typically affects small-to-medium-sized muscular arteries. **Why the correct answer is right:** The hallmark of PAN is **segmental, transmural inflammation** of the vessel wall. The description of **fibrinoid necrosis** with a mixed inflammatory infiltrate (neutrophils and eosinophils) is pathognomonic for the acute phase of PAN. Because it involves the mesenteric arteries, it frequently leads to bowel ischemia, infarction, or perforation. The presence of "recent thrombus" in a "small muscular artery" in a young patient (25 years old) strongly favors a vasculitis over degenerative vascular diseases. **Why incorrect options are wrong:** * **A. Atherosclerosis:** Typically occurs in older patients with risk factors (smoking, DM, HTN). It involves large elastic arteries and shows cholesterol plaques rather than fibrinoid necrosis. * **B. Cystic medial necrosis:** Characterized by the degeneration of the tunica media (common in Marfan syndrome), leading to aortic aneurysms or dissections, not small bowel infarction via small artery occlusion. * **C. Monckeberg’s arteriosclerosis:** Involves dystrophic calcification of the media in medium-sized arteries. It is usually an incidental finding as it does not narrow the lumen and does not cause ischemia. **High-Yield Clinical Pearls for NEET-PG:** * **PAN Association:** Strongly associated with **Hepatitis B surface antigen (HBsAg)** in ~30% of cases. * **Vessel Involvement:** PAN characteristically **spares the pulmonary vessels**. * **Imaging:** Classic "string of pearls" appearance on angiography due to microaneurysms. * **Key Histology:** Lesions of **different stages** (acute fibrinoid necrosis vs. fibrous thickening) coexist in the same or different vessels.
Question 823: Dumping syndrome is characterized by all of the following except?
- A. Colic
- B. Tremors and giddiness
- C. Hyperglycemia (Correct Answer)
- D. Epigastric fullness
Explanation: **Explanation:** Dumping syndrome is a common complication following gastric surgeries (like Billroth I/II or Roux-en-Y gastric bypass) where the pyloric mechanism is bypassed or destroyed, leading to rapid emptying of hypertonic chyme into the small intestine. **Why Hyperglycemia is the Correct Answer:** Dumping syndrome is characterized by **Hypoglycemia**, not hyperglycemia. In **Late Dumping** (occurring 1–3 hours post-mally), the rapid delivery of carbohydrates to the proximal small bowel causes a sudden spike in blood glucose. This triggers an exaggerated release of **insulin** (the "incretin effect"), which subsequently leads to **reactive hypoglycemia**. **Analysis of Incorrect Options:** * **Colic & Epigastric Fullness:** These are classic symptoms of **Early Dumping** (occurring 10–30 minutes post-mally). The hypertonic load in the duodenum draws fluid from the intravascular space into the lumen (osmotic shift), causing bowel distension, cramping (colic), and fullness. * **Tremors and Giddiness:** These are autonomic symptoms. In Early Dumping, they result from decreased intravascular volume and the release of vasoactive substances (serotonin, bradykinin). In Late Dumping, they are clinical manifestations of hypoglycemia. **NEET-PG Clinical Pearls:** * **Early Dumping:** Most common; due to osmotic fluid shift; managed by frequent small, dry meals and avoiding high-osmolarity fluids. * **Late Dumping:** Due to hyperinsulinism/reactive hypoglycemia. * **Sigstad’s Score:** Used clinically to diagnose dumping syndrome (Score >7 is diagnostic). * **Medical Management:** Octreotide (somatostatin analogue) is the most effective medical treatment for refractory cases. * **Dietary Advice:** High protein, high fat, low carbohydrate diet; "Recumbent position" (lying down) after meals helps delay emptying.
Question 824: After subtotal colectomy for toxic megacolon in Crohn's disease, which surgical option is associated with the lowest recurrence rate?
- A. Complete proctectomy with Brooke ileostomy (Correct Answer)
- B. Ileorectal anastomosis
- C. Koch's pouch
- D. Ileal pouch-anal anastomosis (IPAA)
Explanation: **Explanation:** In the management of Crohn’s disease (CD) requiring surgery, the primary goal is to minimize recurrence, as CD can affect any part of the gastrointestinal tract. **Why Option A is Correct:** Complete proctectomy with a permanent **Brooke ileostomy** is associated with the lowest recurrence rate because it involves the total removal of the colon and rectum (Pan-proctocolectomy). By removing all colorectal mucosa and the anal canal, the risk of clinical recurrence in the pelvic region is eliminated. While CD can still recur in the small bowel (pre-stomal ileitis), this procedure provides the most definitive "cure" for the colonic manifestation of the disease. **Why Other Options are Incorrect:** * **B. Ileorectal Anastomosis:** This leaves the rectum in situ. In CD, the rectum is frequently involved or becomes involved later, leading to high rates of proctitis, fistula formation, and a high failure rate requiring subsequent proctectomy. * **C. Koch’s Pouch:** This is a continent ileostomy. It is generally **contraindicated** in Crohn’s disease because if the disease recurs in the small bowel used to create the pouch, the entire reservoir must be excised, leading to significant loss of small bowel length and potential Short Bowel Syndrome. * **D. Ileal Pouch-Anal Anastomosis (IPAA):** While the gold standard for Ulcerative Colitis, IPAA is typically avoided in CD. The risk of pouch failure due to perianal fistulas, pouchitis, and small bowel recurrence is prohibitively high (often >50%). **Clinical Pearls for NEET-PG:** * **Surgery in CD is NOT curative** (unlike in Ulcerative Colitis), but proctocolectomy offers the longest disease-free interval. * **Toxic Megacolon:** The initial emergency surgery of choice is **Subtotal Colectomy with End Ileostomy** (leaving the rectal stump) to stabilize the patient. The choice of completion surgery (Option A vs B) is decided later. * **Most common site of CD recurrence:** Neoterminal ileum (proximal to the anastomosis).
Question 825: What is the commonest cause of mortality in liver transplant operations?
- A. Pulmonary atelectasis
- B. Anastomotic leak (Correct Answer)
- C. Thoracic duct fistula
- D. Subdiaphragmatic collection
Explanation: **Explanation:** In the context of liver transplantation, surgical complications are a significant cause of morbidity and mortality. Among the options provided, **Anastomotic leak** (specifically biliary anastomosis) is the most critical surgical complication leading to mortality. 1. **Why Anastomotic Leak is Correct:** Biliary complications are often referred to as the "Achilles' heel" of liver transplantation. An anastomotic leak (usually at the choledochocholedochostomy site) leads to bile peritonitis, which rapidly progresses to sepsis and multi-organ failure. Because transplant recipients are on potent immunosuppressants, their ability to contain infection is compromised, and wound healing is delayed, making leaks both more likely and more lethal. 2. **Analysis of Incorrect Options:** * **Pulmonary atelectasis:** While very common postoperatively due to the upper abdominal incision and prolonged anesthesia, it is a cause of morbidity (fever, hypoxia) rather than a primary cause of mortality. * **Thoracic duct fistula:** This is a rare complication resulting from injury during the mobilization of the esophagus or retroperitoneum. While it causes nutritional and immunological challenges (chylous ascites/thorax), it is rarely fatal. * **Subdiaphragmatic collection:** These are common post-transplant but are usually managed effectively with percutaneous drainage and antibiotics. They carry a much lower mortality risk compared to an active anastomotic leak. **High-Yield Clinical Pearls for NEET-PG:** * **Most common biliary complication:** Biliary stricture (more common than leaks, but leaks are more acutely fatal). * **Most common vascular complication:** Hepatic artery thrombosis (HAT). This is a surgical emergency and the most common cause of early graft failure. * **Primary cause of death (Overall):** While anastomotic leaks are a major surgical cause, **Infection/Sepsis** remains the leading cause of death in the first year post-transplant.
Question 826: Which of the following is NOT true about Boerhaave's syndrome?
- A. Lower third esophageal tear
- B. Hematemesis as an early symptom (Correct Answer)
- C. Acute chest pain
- D. Surgical treatment indicated
Explanation: **Boerhaave’s Syndrome** is a spontaneous, transmural perforation of the esophagus, typically occurring after forceful vomiting or retching against a closed glottis (Mackler’s triad: vomiting, chest pain, and subcutaneous emphysema). ### Why Option B is the Correct Answer (NOT True) In Boerhaave’s syndrome, the tear is **transmural** (full-thickness). Because the perforation allows gastric contents and blood to escape into the mediastinum or pleural cavity rather than being vomited out, **hematemesis is rare**. In contrast, hematemesis is the hallmark of **Mallory-Weiss Syndrome**, which involves only a mucosal/submucosal tear. ### Explanation of Other Options * **A. Lower third esophageal tear:** This is true. The most common site of perforation is the **left posterolateral aspect of the distal esophagus** (2–3 cm above the gastroesophageal junction), as this area lacks longitudinal muscle support. * **C. Acute chest pain:** This is true. Patients typically present with sudden, excruciating retrosternal "tearing" pain that can mimic myocardial infarction or aortic dissection. * **D. Surgical treatment indicated:** This is true. Boerhaave’s is a surgical emergency. Management usually involves primary repair and mediastinal drainage within 24 hours. ### High-Yield Clinical Pearls for NEET-PG * **Diagnosis:** The gold standard is a **Gastrografin swallow** (water-soluble contrast) showing extravasation. * **Chest X-ray:** May show pneumomediastinum, pleural effusion (usually left-sided), or the **V-sign of Naclerio** (air behind the heart). * **Pleural Fluid Analysis:** High amylase levels (of salivary origin) and low pH are characteristic. * **Mortality:** It has the highest mortality rate of all GI perforations if not treated promptly.
Question 827: Which one of the following reagents is not used as a sclerosant in the treatment of bleeding varices?
- A. Ethyl alcohol (Correct Answer)
- B. Ethanolamine oleate
- C. Phenol
- D. Sodium morrhuate
Explanation: **Explanation:** Endoscopic Sclerotherapy (EST) involves the injection of a sclerosing agent into or around esophageal varices to induce thrombosis, inflammation, and eventual fibrosis, thereby obliterating the vessel. **Why Ethyl Alcohol is the Correct Answer:** **Ethyl alcohol (Absolute Alcohol)** is not used as a sclerosant for esophageal varices. While it is a potent sclerosing agent, it is primarily used for the treatment of vascular malformations, renal tumors (pre-operative embolization), or as a neurolytic agent. In the context of the GI tract, it is highly tissue-toxic and carries a significant risk of causing deep transmural necrosis and esophageal perforation if used for variceal sclerotherapy. **Analysis of Other Options:** * **Ethanolamine Oleate (5%):** This is one of the most commonly used sclerosants. It acts by damaging the vascular endothelium, leading to platelet aggregation and clot formation. * **Phenol (5% in Almond Oil):** Historically used for hemorrhoids, but also used in variceal sclerotherapy. It acts as a chemical irritant causing perivascular fibrosis. * **Sodium Morrhuate (5%):** A mixture of sodium salts of fatty acids from cod liver oil. It is an effective sclerosant but has a higher risk of anaphylaxis compared to synthetic agents. **Clinical Pearls for NEET-PG:** * **Commonly used Sclerosants:** Ethanolamine oleate, Sodium tetradecyl sulfate (STDS), Polidocanol, and Sodium morrhuate. * **Complications of EST:** Esophageal ulceration (most common), stricture formation, and perforation. * **Current Gold Standard:** Endoscopic Variceal Ligation (EVL) or "Banding" is now preferred over sclerotherapy for the management of esophageal varices due to lower complication rates and better efficacy.
Question 828: The management of adenocarcinoma of the small intestine depends primarily on tumour location. Which of the following statements concerning surgical management is true?
- A. Adenocarcinomas of the jejunum or ileum require limited segmental resection.
- B. Radical pancreaticoduodenectomy is used for resection of duodenal adenocarcinomas. (Correct Answer)
- C. Distal ileal carcinomas are managed by right hemicolectomy.
- D. Small invasive adenocarcinomas of the ampulla and peri-ampullary duodenum are managed by local excision.
Explanation: **Explanation:** The management of small bowel adenocarcinoma is dictated by the anatomical location and the necessity of achieving negative margins (R0 resection) along with adequate lymphadenectomy. **Why Option B is Correct:** Adenocarcinomas of the **duodenum** (the most common site for small bowel adenocarcinoma) are typically managed with a **radical pancreaticoduodenectomy (Whipple procedure)**. This is because the duodenum shares a common blood supply (pancreaticoduodenal arches) and lymphatic drainage with the head of the pancreas. Segmental resection is rarely feasible or oncologically sound for duodenal malignancies, especially those in the first and second parts. **Analysis of Incorrect Options:** * **Option A:** Adenocarcinomas of the jejunum and ileum require **wide segmental resection** with a formal mesenteric lymphadenectomy, not limited resection. The goal is to remove the primary tumor along with the draining lymph nodes at the root of the mesentery. * **Option C:** While distal ileal carcinomas are indeed managed by **right hemicolectomy** (to ensure clearance of the ileocolic lymph node basin), the question asks for the *most* definitive statement regarding surgical management. In many standardized surgical texts (like Sabiston or Bailey & Love), the gold standard for duodenal adenocarcinoma is specifically highlighted as the Whipple procedure. *(Note: In some clinical scenarios, Option C is also considered correct; however, in the context of this specific MCQ, Option B is the classic textbook answer for "radical" management).* * **Option D:** Local excision is generally reserved for benign polyps or very early (Tis) tumors. **Invasive** adenocarcinomas, even if small, require radical resection (Whipple) due to the high risk of nodal metastasis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Duodenum (specifically the second part/periampullary region). * **Risk Factors:** Familial Adenomatous Polyposis (FAP), Lynch Syndrome, Crohn’s Disease (usually ileal), and Celiac Disease. * **Prognosis:** Generally poorer than colorectal cancer because they often present late with obstruction or jaundice. * **Nodal Yield:** At least 12 lymph nodes should be examined for adequate staging.
Question 829: In Peutz-Jeghers syndrome, where are polyps mainly found?
- A. Rectum
- B. Colon
- C. Esophagus
- D. Jejunum (Correct Answer)
Explanation: **Explanation:** Peutz-Jeghers Syndrome (PJS) is an autosomal dominant condition characterized by the mutation of the **STK11 (LKB1)** gene on chromosome 19. It is clinically defined by the triad of mucocutaneous pigmentation, gastrointestinal hamartomatous polyps, and an increased risk of visceral malignancies. **Why Jejunum is correct:** While PJS polyps can occur anywhere in the gastrointestinal tract (from the stomach to the rectum), they are most characteristically and frequently found in the **small intestine**. Within the small bowel, the **jejunum** is the most common site of involvement (followed by the ileum and duodenum). These polyps are histologically unique "hamartomas" featuring a characteristic "arborizing" pattern of smooth muscle proliferation. **Analysis of Incorrect Options:** * **A & B (Rectum and Colon):** Although polyps can occur in the large bowel (approx. 30% of cases), they are significantly less common here than in the small intestine. * **C (Esophagus):** The esophagus is rarely involved in PJS because it lacks the glandular mucosa where these hamartomatous growths typically originate. **High-Yield Clinical Pearls for NEET-PG:** * **Most common complication:** Intussusception (often leading to small bowel obstruction). * **Pigmentation:** Characteristically found on the lips, buccal mucosa, and digits; unlike freckles, these do not fade with sun exposure. * **Cancer Risk:** Patients have a significantly high lifetime risk of both GI (colorectal, pancreatic) and extra-GI cancers (breast, ovary, cervix, and **Sertoli cell tumors** of the testis). * **Surveillance:** Regular screening via upper GI endoscopy, colonoscopy, and capsule endoscopy/MRCP is mandatory.
Question 830: What is the treatment of choice for Hinchey Grade 2 diverticulitis?
- A. Bowel resection
- B. Laparoscopy guided drain (Correct Answer)
- C. USG guided drain
- D. Oral metronidazole
Explanation: ***Laparoscopy guided drain*** - **Grade 2 diverticulitis** (according to Hinchey classification) involves **pelvic or distant abscess formation**, requiring drainage for optimal management. - **Laparoscopic drainage** allows for precise visualization, complete evacuation of infected material, and **peritoneal lavage** while being minimally invasive. *Bowel resection* - Reserved for **Grade 3-4 diverticulitis** with **generalized peritonitis** or **fecal peritonitis**, not for localized abscess formation. - This is an **overly aggressive** approach for Grade 2 disease and carries higher morbidity and mortality risks. *USG guided drain* - Appropriate for **Grade 1 diverticulitis** with **small paracolic abscesses** that are easily accessible percutaneously. - **Grade 2 abscesses** in the pelvis or distant locations are often **not accessible** or adequately drained via ultrasound guidance alone. *Oral metronidazole* - Suitable for **uncomplicated diverticulitis** (Grade 0) without abscess formation or systemic complications. - **Inadequate for Grade 2** disease as it cannot address the established **abscess collection** requiring mechanical drainage.
Practice by Chapter
Esophageal Disorders
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Gastric Disorders
Practice Questions
Small Intestine Pathology
Practice Questions
Appendicitis
Practice Questions
Inflammatory Bowel Disease
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Intestinal Obstruction
Practice Questions
Gastrointestinal Bleeding
Practice Questions
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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