Gastrointestinal Surgery — MCQs
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What is the most frequent mechanism leading to appendiceal perforation?
All are features of ileocecal tuberculosis except?
A 72-year-old man undergoes a subtotal colectomy for a cecal perforation due to a sigmoid colon obstruction. He has had a prolonged recovery and has been on total parenteral nutrition (TPN) for 2 weeks postoperatively. After regaining bowel function, he experienced significant diarrhea. Examination of his abdominal wound demonstrates minimal granulation tissue. He complains that he has lost his taste for food. He also has increased hair loss and a new perioral pustular rash. Which of the following deficiencies does he most likely have?
Which artery is not ligated during a surgery of the cecum?
All of the following are true about small bowel lymphoma except?
Upper GI endoscopy is indicated in all of the following conditions, except:
Phytobezoars are composed of?
Saint's triad includes all of the following except:
Which of the following is an indication for urgent ERCP in pancreatitis?
What is true about diverticulitis?
Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs
Question 871: What is the most frequent mechanism leading to appendiceal perforation?
- A. Impacted faecolith
- B. Tension gangrene due to accumulating secretions (Correct Answer)
- C. Necrosis of a lymphoid patch
- D. Retrocaecal appendix
Explanation: ### Explanation The correct answer is **B. Tension gangrene due to accumulating secretions.** **Pathophysiology of Perforation:** The primary event in acute appendicitis is luminal obstruction. Once the lumen is blocked, the continuous secretion of mucus by the appendiceal mucosa leads to a rapid increase in **intraluminal pressure**. This pressure eventually exceeds the capillary perfusion pressure, leading to venous congestion and subsequent arterial compromise. The resulting ischemia causes **tension gangrene**, typically occurring at the antimesenteric border (the point of least blood supply), which ultimately leads to perforation. **Analysis of Incorrect Options:** * **A. Impacted faecolith:** While a faecolith is the most common *cause of obstruction* in adults, it is the inciting event, not the direct *mechanism* of perforation itself. Perforation is a secondary ischemic result of the obstruction. * **C. Necrosis of a lymphoid patch:** Lymphoid hyperplasia is a common cause of obstruction in children, but like the faecolith, it is a predisposing factor rather than the physiological mechanism of wall rupture. * **D. Retrocaecal appendix:** This refers to the anatomical position (the most common position, ~65%). While it may mask clinical signs (leading to a delay in diagnosis), the position itself does not cause perforation. **NEET-PG High-Yield Pearls:** * **Most common cause of obstruction:** Faecolith (Adults), Lymphoid Hyperplasia (Children). * **Sequence of symptoms (Murphy’s Triad):** Pain (periumbilical shifting to RIF), followed by vomiting, then fever. * **Perforation Risk:** Highest at the extremes of age (very young and elderly) due to delayed diagnosis or a thin appendiceal wall. * **Site of perforation:** Usually the antimesenteric border, distal to the point of obstruction.
Question 872: All are features of ileocecal tuberculosis except?
- A. Pulled Up Cecum
- B. Fleischner Sign
- C. Goose Neck Deformity
- D. Wind-Sock Appearance of duodenum (Correct Answer)
Explanation: **Explanation:** Ileocecal tuberculosis is the most common form of abdominal tuberculosis, characterized by chronic inflammation, ulceration, and subsequent fibrosis of the ileocecal region. **Why Option D is the Correct Answer:** The **Wind-sock appearance** is a classic radiological sign of a **Duodenal Web** (a congenital cause of duodenal obstruction), not tuberculosis. It occurs when a thin, mucosal web prolapses distally due to peristalsis, creating a balloon-like appearance on a barium swallow. **Analysis of Incorrect Options (Features of Ileocecal TB):** * **A. Pulled Up Cecum:** Chronic fibrotic changes and contraction of the terminal ileum and mesentery cause the cecum to be pulled superiorly and medially out of the right iliac fossa. * **B. Fleischner Sign:** This refers to a gaping, patulous ileocecal valve caused by infiltration and thickening of the valve lips. * **C. Goose Neck Deformity:** This occurs when there is significant narrowing and rigidity of the terminal ileum, leading to a loss of its normal redundant loops, making it appear straight and tubular. **High-Yield NEET-PG Pearls:** * **Stierlin Sign:** Rapid emptying of the inflamed terminal ileum into the cecum (seen as a narrow streak of barium). * **Sterling Sign:** A filling defect in the cecum due to an incompetent ileocecal valve. * **Conical Cecum:** Symmetrical contraction and shriveling of the cecum due to transmural fibrosis. * **Gold Standard Diagnosis:** Colonoscopy with biopsy (shows granulomas) or GeneXpert/MTB culture.
Question 873: A 72-year-old man undergoes a subtotal colectomy for a cecal perforation due to a sigmoid colon obstruction. He has had a prolonged recovery and has been on total parenteral nutrition (TPN) for 2 weeks postoperatively. After regaining bowel function, he experienced significant diarrhea. Examination of his abdominal wound demonstrates minimal granulation tissue. He complains that he has lost his taste for food. He also has increased hair loss and a new perioral pustular rash. Which of the following deficiencies does he most likely have?
- A. Zinc (Correct Answer)
- B. Selenium
- C. Molybdenum
- D. Chromium
Explanation: **Explanation:** The clinical presentation described is a classic manifestation of **Zinc deficiency**, a common complication in patients on long-term Total Parenteral Nutrition (TPN) without adequate supplementation or those with high-output gastrointestinal losses (like diarrhea or fistulas). **Why Zinc is the correct answer:** Zinc is a vital cofactor for over 300 enzymes, including those involved in DNA synthesis and cell division. Its deficiency typically presents with: * **Dermatological signs:** Perioral and perianal pustular/eczematous rashes (Acrodermatitis enteropathica-like). * **Wound healing:** Impaired granulation tissue formation and delayed healing. * **Sensory changes:** Loss of taste (**hypogeusia**) and smell. * **Other features:** Alopecia (hair loss), diarrhea, and impaired immune function. **Why other options are incorrect:** * **Selenium:** Deficiency leads to **Keshan disease** (cardiomyopathy) and skeletal muscle dysfunction. * **Molybdenum:** Deficiency is rare but can lead to tachycardia, tachypnea, and neurological irritability due to metabolic disturbances (sulfite toxicity). * **Chromium:** Deficiency is associated with **glucose intolerance** and insulin resistance, mimicking diabetes mellitus in TPN patients. **High-Yield Clinical Pearls for NEET-PG:** * **Zinc** is primarily excreted via the GI tract; therefore, patients with high-output diarrhea or fistulas are at high risk. * **Copper deficiency** presents with microcytic anemia and neutropenia (mimicking Vitamin B12 deficiency but with low copper levels). * **Manganese toxicity** (often from TPN) can cause Parkinsonian-like symptoms (extrapyramidal signs). * **Key Triad for Zinc Deficiency:** Dermatitis (perioral), Alopecia, and Diarrhea.
Question 874: Which artery is not ligated during a surgery of the cecum?
- A. Ileocolic artery
- B. Right colic artery
- C. Left colic artery
- D. Right branch of the middle colic artery (Correct Answer)
Explanation: **Explanation:** The surgical management of cecal pathologies (such as cecal carcinoma or complicated appendicitis) typically involves a **Right Hemicolectomy**. The goal of this procedure is to remove the cecum, ascending colon, and the proximal transverse colon along with their associated lymphatic drainage. **Why the "Right branch of the middle colic artery" is the correct answer:** In a standard right hemicolectomy, the **Middle Colic Artery** is preserved to maintain blood supply to the remaining transverse colon. Only the **Right branch** of the middle colic artery is sometimes ligated if the resection extends further into the transverse colon. However, in many standard techniques focusing on the cecum, the middle colic artery and its branches are carefully preserved to ensure the viability of the anastomosis (usually an ileotransverse anastomosis). Among the choices provided, it is the vessel least likely to be routinely sacrificed compared to those directly supplying the cecum and ascending colon. **Analysis of Incorrect Options:** * **A. Ileocolic Artery:** This is the primary blood supply to the cecum and terminal ileum. It is the "pedicle" of a right hemicolectomy and **must** be ligated at its origin from the Superior Mesenteric Artery (SMA). * **B. Right Colic Artery:** This supplies the ascending colon. It is ligated to ensure adequate lymphadenectomy and mobilization of the right colon. * **C. Left Colic Artery:** This is a branch of the **Inferior Mesenteric Artery (IMA)** and supplies the descending colon. It is anatomically distant from the cecum and is never involved in cecal surgery. *(Note: While this is also not ligated, in the context of "Right Hemicolectomy" board questions, the Middle Colic branches are the classic "distractor" regarding the extent of resection).* **High-Yield Clinical Pearls for NEET-PG:** * **Standard Right Hemicolectomy:** Involves ligation of the Ileocolic and Right Colic arteries. * **Extended Right Hemicolectomy:** Performed for hepatic flexure or proximal transverse colon growths; involves ligation of the **Right branch** (or the main trunk) of the Middle Colic artery. * **Critical Point:** The **Marginal Artery of Drummond** provides the collateral circulation that allows for safe anastomosis after these ligations. * **Lymphadenectomy:** The extent of arterial ligation in cancer surgery is dictated by the need to remove the associated lymph nodes at the origin of the vessels.
Question 875: All of the following are true about small bowel lymphoma except?
- A. Treatment is resection of involved segment with chemoradiotherapy.
- B. AIDS and Celiac disease are predisposing conditions.
- C. It is a very common tumour amongst small bowel malignancies. (Correct Answer)
- D. It may present with hemorrhage and perforation.
Explanation: **Explanation:** Small bowel malignancies are relatively rare, accounting for only about 1-2% of all gastrointestinal cancers. Among these, **Adenocarcinoma** is the most common histological type (approx. 40%), followed by Carcinoid tumors. **Lymphoma** ranks third, making the statement that it is a "very common tumor" incorrect. **Analysis of Options:** * **Option C (Correct Answer):** As stated, Lymphoma is not the most common; Adenocarcinoma holds that position. In the small bowel, the ileum is the most common site for lymphoma due to the high concentration of lymphoid tissue (Peyer's patches). * **Option A:** The standard management involves surgical resection of the affected segment and its mesentery (to prevent complications like perforation during treatment) followed by adjuvant chemotherapy (CHOP regimen). Radiotherapy is used in specific cases. * **Option B:** Immunosuppression is a major risk factor. **AIDS** is associated with B-cell lymphomas, while **Celiac disease** is strongly linked to Enteropathy-associated T-cell lymphoma (EATL). Other risks include Crohn’s disease and SLE. * **Option D:** Unlike adenocarcinoma which often causes obstruction, lymphomas are "bulky" and can lead to **perforation** (especially after starting chemotherapy) or **hemorrhage** due to tumor necrosis. **NEET-PG High-Yield Pearls:** * **Most common site for Small Bowel Lymphoma:** Ileum. * **Most common site for Small Bowel Adenocarcinoma:** Duodenum. * **EATL (Enteropathy-associated T-cell lymphoma):** Specifically associated with refractory Celiac disease; carries a poor prognosis. * **IPSID (Immunoproliferative Small Intestinal Disease):** A variant of MALT lymphoma seen in the Mediterranean region, associated with *H. pylori* or *Campylobacter jejuni*.
Question 876: Upper GI endoscopy is indicated in all of the following conditions, except:
- A. Peptic ulceration
- B. Achalasia cardiae
- C. Barrett's esophagus
- D. Corrosive ingestion: delayed phase (Correct Answer)
Explanation: **Explanation:** Upper Gastrointestinal (UGI) endoscopy is a vital diagnostic and therapeutic tool, but its timing is critical, especially in cases of chemical injury. **Why Option D is the correct answer:** In **corrosive ingestion**, the timing of endoscopy is strictly defined. It is indicated within the first **12–24 hours** (early phase) to assess the severity of the injury. However, it is **strictly contraindicated in the delayed phase (5–15 days)**. During this period, the necrotic tissue sloughs off, and the esophageal wall is at its thinnest and weakest due to intense inflammation and collagen remodeling. Performing an endoscopy during this "vulnerable window" carries a high risk of **iatrogenic perforation**. **Why the other options are incorrect:** * **Peptic Ulceration:** Endoscopy is the gold standard for diagnosis, allowing for direct visualization, biopsy (to rule out malignancy or *H. pylori*), and therapeutic intervention (e.g., clipping or cauterization of bleeding vessels). * **Achalasia Cardiae:** Endoscopy is essential to rule out "pseudoachalasia" (malignancy at the GE junction) and to visualize the dilated esophagus and retained food particles. * **Barrett’s Esophagus:** Endoscopy with biopsy is mandatory for diagnosis (identifying intestinal metaplasia) and for long-term surveillance to monitor for progression to adenocarcinoma. **Clinical Pearls for NEET-PG:** * **Corrosive Injury:** The most common site of stricture is the **esophagus** (alkali) or **antrum** (acid). * **Contraindications to UGI Endoscopy:** Suspected perforation, hemodynamic instability, and the subacute/delayed phase of corrosive injury. * **Water-soluble contrast (Gastrografin)** is preferred over Barium if perforation is suspected during any stage.
Question 877: Phytobezoars are composed of?
- A. Hair
- B. Vegetable Matter (Correct Answer)
- C. Undigested food
- D. Desquamated epithelial cells
Explanation: **Explanation:** A **bezoar** is a solid mass of indigestible material that accumulates in the digestive tract, most commonly in the stomach. They are classified based on their primary composition. **1. Why "Vegetable Matter" is correct:** **Phytobezoars** are the most common type of bezoar. They are composed of indigestible plant fibers such as cellulose, hemicellulose, lignin, and tannins. These are frequently found in patients with impaired gastric motility (e.g., gastroparesis) or following gastric surgeries like vagotomy or antrectomy, which reduce acid secretion and mechanical churning. A specific subtype, the *diospyrobezoar*, is formed from unripened persimmons. **2. Why the other options are incorrect:** * **A. Hair:** These are called **Trichobezoars**. They are typically seen in young females with psychiatric disorders (trichotillomania and trichophagia). A large trichobezoar extending into the small intestine is known as **Rapunzel Syndrome**. * **C. Undigested food:** While bezoars are made of food components, "Phyto-" specifically refers to plant/vegetable origin. General undigested food is too broad a term. * **D. Desquamated epithelial cells:** These are not a primary component of bezoars. However, **Lactobezoars** (composed of undigested milk curds) are seen in infants. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Stomach. * **Most common symptom:** Gastric outlet obstruction or vague abdominal pain. * **Gold Standard Diagnosis:** Upper GI Endoscopy. * **Management:** Small phytobezoars can sometimes be dissolved using **Cellulase** or **Coca-Cola lavage**. Large or obstructive masses require endoscopic removal or surgical laparotomy.
Question 878: Saint's triad includes all of the following except:
- A. Gall stones
- B. Cholangitis (Correct Answer)
- C. Diverticulosis
- D. Hiatus hernia
Explanation: **Explanation:** **Saint’s Triad** is a classic clinical triad where three distinct, unrelated pathological conditions coexist in a single patient. The correct answer is **Cholangitis** because it is not a component of this triad. The triad consists of: 1. **Gallstones (Cholelithiasis)** 2. **Diverticulosis (Colonic)** 3. **Hiatus Hernia** **Why Cholangitis is the correct answer:** While gallstones are a component of the triad, **Cholangitis** (inflammation/infection of the bile duct) is a potential complication of gallstones but is not part of the original triad described by Saint. **Analysis of other options:** * **Gallstones (Option A):** A core component. It is theorized that a low-fiber diet (common in Western populations) contributes to both gallstones and diverticulosis. * **Diverticulosis (Option B):** A core component. It refers to the presence of multiple outpocketings in the colon, often associated with increased intraluminal pressure. * **Hiatus Hernia (Option D):** A core component. It involves the protrusion of the stomach into the chest through the esophageal hiatus. **Clinical Pearls for NEET-PG:** * **Significance:** Saint’s Triad emphasizes that a patient’s symptoms may not always be explained by a single diagnosis (**Occam’s Razor** vs. **Hickam’s Dictum**). If a patient presents with vague abdominal symptoms, the presence of one condition (e.g., gallstones) should not preclude the search for others (e.g., diverticulosis). * **Etiology:** The triad is often linked to a **low-fiber diet** and sedentary lifestyle, which are common risk factors for all three conditions. * **Distinction:** Do not confuse Saint’s Triad with **Charcot’s Triad** (Jaundice, Fever, RUQ pain), which is specifically used to diagnose **Acute Cholangitis**.
Question 879: Which of the following is an indication for urgent ERCP in pancreatitis?
- A. Acute alcoholic pancreatitis
- B. Acute necrotizing pancreatitis
- C. Acute biliary pancreatitis with cholangitis (Correct Answer)
- D. Chronic calcific pancreatitis with pseudocyst
Explanation: **Explanation:** The management of acute pancreatitis is primarily supportive; however, **Acute Biliary Pancreatitis with Cholangitis** is a critical exception requiring urgent intervention. **1. Why Option C is Correct:** The presence of **cholangitis** (fever, jaundice, and right upper quadrant pain) indicates an ongoing biliary obstruction with a superimposed infection. In such cases, **Urgent ERCP (within 24 hours)** is mandatory to decompress the biliary tree and remove the obstructing stone. Without drainage, the risk of sepsis and mortality increases significantly. ERCP is also indicated in biliary pancreatitis with persistent common bile duct (CBD) obstruction (jaundice or dilated CBD) even without overt cholangitis. **2. Why Other Options are Incorrect:** * **Option A (Alcoholic Pancreatitis):** The etiology is toxic/metabolic, not mechanical. ERCP has no role and may worsen the inflammation. * **Option B (Necrotizing Pancreatitis):** Management is initially conservative. Intervention (like necrosectomy) is only indicated if the necrosis becomes infected, usually after 3–4 weeks. ERCP does not address parenchymal necrosis. * **Option D (Chronic Pancreatitis with Pseudocyst):** While ERCP can be used to drain pseudocysts communicating with the pancreatic duct, it is an **elective** procedure, not an urgent one. **Clinical Pearls for NEET-PG:** * **Timing of ERCP:** Urgent (<24 hrs) if cholangitis is present; Early (<72 hrs) if there is persistent biliary obstruction. * **Gold Standard for Diagnosis:** Contrast-Enhanced CT (CECT) is the investigation of choice for diagnosing necrosis (ideally done after 72–96 hours). * **MRCP vs. ERCP:** MRCP is diagnostic (non-invasive); ERCP is therapeutic. Use MRCP if the suspicion of a CBD stone is low to moderate. * **Predicting Severity:** Ranson’s Criteria and APACHE II scores are high-yield for exam questions regarding prognosis.
Question 880: What is true about diverticulitis?
- A. Occurs at any age
- B. Often an incidental finding during operation
- C. Young patients have more aggressive disease
- D. Left-sided colon involvement is more common (Correct Answer)
Explanation: **Explanation:** Diverticulitis is the inflammation or infection of diverticula (outpouchings of the colonic wall). **1. Why Option D is Correct:** In Western populations and as per standard surgical textbooks (Bailey & Love, Sabiston), **left-sided involvement (specifically the Sigmoid Colon)** is the most common site for diverticulitis. This is due to the smaller caliber of the sigmoid colon and the higher intraluminal pressures generated there, which lead to the formation of false diverticula (pulsion type). **2. Why Other Options are Incorrect:** * **Option A:** Diverticulitis is primarily a disease of the **elderly**. Its incidence increases significantly with age, typically affecting individuals over 50–60 years. It is uncommon in patients under 40. * **Option B:** Diverticulosis (asymptomatic presence of diverticula) is often an incidental finding. However, **Diverticulitis** is a clinical diagnosis characterized by acute symptoms (left lower quadrant pain, fever, leucocytosis) and is rarely an "incidental" finding during surgery. * **Option C:** While earlier studies suggested younger patients had more aggressive disease, recent large-scale data indicates that the clinical course and risk of recurrence in young patients are **similar** to older patients. Age alone is no longer considered an indication for more aggressive surgical management. **High-Yield Clinical Pearls for NEET-PG:** * **"Left-sided Appendicitis":** A common clinical synonym for sigmoid diverticulitis. * **Investigation of Choice:** **CECT Abdomen** (shows bowel wall thickening, pericolic fat stranding). * **Contraindicated in Acute Phase:** Colonoscopy and Barium Enema (due to the high risk of perforation). * **Hinchey Classification:** Used to grade the severity of perforated diverticulitis (Stage I: Pericolic abscess; Stage IV: Fecal peritonitis). * **Treatment:** Uncomplicated cases are managed conservatively (antibiotics/bowel rest); complicated cases (Hinchey III/IV) often require a **Hartmann’s Procedure**.
Practice by Chapter
Esophageal Disorders
Practice Questions
Gastric Disorders
Practice Questions
Small Intestine Pathology
Practice Questions
Appendicitis
Practice Questions
Inflammatory Bowel Disease
Practice Questions
Intestinal Obstruction
Practice Questions
Gastrointestinal Bleeding
Practice Questions
Diverticular Disease
Practice Questions
Anorectal Disorders
Practice Questions
Colorectal Neoplasms
Practice Questions
Gastrointestinal Stomas
Practice Questions
Bariatric Surgery Principles
Practice Questions
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