Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 761: Which of the following vessels is most commonly involved in hemorrhage from a duodenal ulcer?

A. Inferior vena cava
B. Gastroduodenal artery (Correct Answer)
C. Superior mesenteric artery
D. Inferior pancreaticoduodenal artery

Explanation: **Explanation:** The **Gastroduodenal Artery (GDA)** is the correct answer due to its specific anatomical relationship with the duodenum. 1. **Why it is correct:** Most peptic ulcer bleeds occur from ulcers located on the **posterior wall** of the first part of the duodenum (D1). The GDA descends vertically behind the first part of the duodenum. When a posterior duodenal ulcer erodes through the mucosa and muscularis layers, it directly involves the GDA, leading to massive, life-threatening upper gastrointestinal hemorrhage. 2. **Why other options are incorrect:** * **Inferior Vena Cava (IVC):** The IVC lies much deeper in the retroperitoneum and posterior to the head of the pancreas; it is not involved in primary peptic ulcer disease. * **Superior Mesenteric Artery (SMA):** The SMA passes anterior to the third part of the duodenum (D3). While it can cause "SMA syndrome" (compression of D3), it is not the source of bleeding in D1 ulcers. * **Inferior Pancreaticoduodenal Artery:** This vessel supplies the lower part of the duodenum and head of the pancreas. It is a branch of the SMA and is located too distal to be the primary source of bleeding from common D1 ulcers. **Clinical Pearls for NEET-PG:** * **Anterior vs. Posterior:** Posterior duodenal ulcers **bleed** (GDA involvement), whereas anterior duodenal ulcers **perforate** (leading to pneumoperitoneum). * **Source of GDA:** It is a branch of the **Common Hepatic Artery** (which originates from the Celiac Trunk). * **Management:** In refractory bleeding, the surgical approach involves a longitudinal duodenotomy and a **three-point "U" stitch** (transfixion) to ligate the GDA.

Question 762: What is a characteristic feature of jejunal diverticula?

A. Impaired folate absorption
B. Impaired ferritin absorption
C. Impaired vitamin B12 absorption (Correct Answer)
D. Positive urea breath test

Explanation: ### Explanation **Correct Answer: C. Impaired vitamin B12 absorption** Jejunal diverticula are typically **acquired, false diverticula** (consisting only of mucosa and submucosa) that occur on the mesenteric border. The primary clinical significance of multiple jejunal diverticula is their association with **Small Intestinal Bacterial Overgrowth (SIBO)**. The stagnant loop within the diverticula promotes the proliferation of anaerobic bacteria. These bacteria compete with the host for nutrients; specifically, they **deconjugate bile salts** and **consume Vitamin B12** (cyanocobalamin) before it can reach the terminal ileum for absorption. This leads to megaloblastic anemia and malabsorption. **Analysis of Incorrect Options:** * **A & B: Impaired folate and ferritin absorption:** Folate and iron (ferritin) are primarily absorbed in the proximal small intestine (duodenum and proximal jejunum). In SIBO, bacteria actually **synthesize folate**, often leading to *elevated* serum folate levels. Therefore, folate deficiency is not a feature. * **D: Positive urea breath test:** This test is specific for detecting *Helicobacter pylori* infection in the stomach, as *H. pylori* produces urease. It is not used to diagnose jejunal diverticula or SIBO (where Glucose or Lactulose breath tests are preferred). **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Occur on the **mesenteric border** (where vasa recta enter the muscularis). * **Triad of Complications:** Malabsorption (B12 deficiency), Diverticulitis, and Perforation/Obstruction. * **Diagnosis:** Often an incidental finding on CT or Enteroclysis; SIBO is confirmed via **Glucose Hydrogen Breath Test**. * **Treatment:** Asymptomatic cases require no treatment. SIBO is managed with antibiotics (e.g., Rifaximin); surgery is reserved for complications like perforation.

Question 763: A 26-year-old male presents with acute right lower quadrant abdominal pain. Appendicitis is suspected, and an ultrasound is equivocal. What is the next most appropriate investigation?

A. CT scan (Correct Answer)
B. Plain X-ray
C. Serum ESR
D. MRI abdomen

Explanation: **Explanation:** The clinical presentation is highly suggestive of **Acute Appendicitis**. In cases where the clinical diagnosis is uncertain or the initial ultrasound (USG) is equivocal, **Contrast-Enhanced Computed Tomography (CECT)** is the gold standard and the next most appropriate investigation. **1. Why CT Scan is the Correct Answer:** CT scan has a very high sensitivity (>94%) and specificity (>95%) for diagnosing appendicitis. It is superior to USG in identifying secondary signs (fat stranding, phlegmon, or abscess) and visualizing a retrocecal appendix, which is often missed on ultrasound. In adult males and non-pregnant females, it is the investigation of choice to confirm the diagnosis and rule out differentials. **2. Why Other Options are Incorrect:** * **Plain X-ray:** It is non-specific. While it may show a fecalith (in <10% of cases) or localized ileus, it cannot confirm or exclude appendicitis. Its primary use is to rule out perforation (pneumoperitoneum). * **Serum ESR:** This is a non-specific marker of inflammation. While it may be elevated, it does not provide a localized diagnosis and cannot differentiate appendicitis from other inflammatory conditions. * **MRI Abdomen:** While highly accurate, MRI is expensive and not readily available in emergency settings. It is typically reserved as the second-line investigation for **pregnant women** or pediatric patients when USG is inconclusive, to avoid radiation. **Clinical Pearls for NEET-PG:** * **Most common position of the appendix:** Retrocecal (74%). * **Most common cause of appendicitis:** Fecalith (adults); Lymphoid hyperplasia (children). * **Alvarado Score:** A clinical scoring system where a score of **≥7** is highly suggestive of appendicitis. * **Investigation of Choice (IOC):** USG is the initial investigation (especially in children/pregnant women), but **CT scan** is the most accurate and definitive investigation in adults.

Question 764: A middle-aged patient presents with symptoms suggestive of pathology involving the right hemidiaphragm. All of the following are possible diagnoses except:

A. Subphrenic abscess
B. Acute cholecystitis (Correct Answer)
C. Pyogenic liver abscess
D. Amoebic liver abscess in the right lobe

Explanation: ### **Explanation** The core concept in this question is the anatomical relationship between the liver, the diaphragm, and the gallbladder. The **right hemidiaphragm** is in direct contact with the superior surface of the liver. Any pathology involving the superior aspect of the liver or the space between the liver and the diaphragm (subphrenic space) will directly irritate the right hemidiaphragm or its overlying pleura. **Why Acute Cholecystitis is the Correct Answer:** While the gallbladder is located on the inferior surface of the liver, **acute cholecystitis** typically presents with pain in the right hypochondrium and Murphy’s sign. While it can cause referred pain to the right shoulder (via the phrenic nerve), it does **not** involve the right hemidiaphragm itself. The gallbladder is an infra-hepatic structure, separated from the diaphragm by the bulk of the liver. **Analysis of Other Options:** * **Subphrenic Abscess:** This is a collection of pus specifically located in the space between the diaphragm and the liver, causing direct irritation and often leading to reactive pleural effusion or diaphragmatic elevation. * **Pyogenic & Amoebic Liver Abscesses:** These frequently occur in the **right lobe** (superior/posterior segments). As they expand, they irritate the capsule and the adjacent right hemidiaphragm, often presenting with "diaphragmatic symptoms" like referred shoulder pain or hiccups. ### **High-Yield Clinical Pearls for NEET-PG:** * **Phrenic Nerve (C3-C5):** Irritation of the diaphragm causes referred pain to the **right shoulder tip** (Kehr’s sign is specifically for the left side/spleen, but the mechanism is the same). * **Amoebic Liver Abscess:** Most common in the **Right Lobe (Segment VII/VIII)** due to the bulk of hepatic tissue and portal blood flow patterns. It is a classic cause of right-sided diaphragmatic elevation on X-ray. * **Subphrenic Abscess:** Most commonly occurs as a complication of abdominal surgery (e.g., perforated peptic ulcer or cholecystectomy). Look for "swinging pyrexia" and a fixed, elevated hemidiaphragm.

Question 765: Why does acute appendicitis in elderly patients and in children generally have a worse prognosis?

A. The appendix is retrocecal.
B. The appendix is in the perineal position.
C. The appendix is in the pelvic position.
D. The omentum and peritoneal cavity appear to be less efficient in localizing the disease in these age groups. (Correct Answer)

Explanation: **Explanation:** The prognosis of acute appendicitis is significantly worse in the extremes of age (children and the elderly) primarily due to a failure in the body’s natural defense mechanism to wall off infection. **1. Why Option D is Correct:** In healthy adults, the **greater omentum** (the "policeman of the abdomen") migrates to the site of inflammation, adhering to the appendix to localize the infection and form an "appendicular mass." * **In Children:** The omentum is physically shorter and underdeveloped, making it unable to reach or effectively wrap around an inflamed appendix. * **In the Elderly:** The omentum and peritoneum undergo age-related atrophy and have a diminished vascular response, leading to a delayed or ineffective inflammatory walling-off process. Consequently, both groups are prone to rapid progression from inflammation to **free perforation and generalized peritonitis.** **2. Why Other Options are Incorrect:** * **Options A, B, and C:** These refer to the anatomical positions of the appendix. While the **retrocecal** position (most common, ~65%) can mask clinical signs (leading to delayed diagnosis), and the **pelvic** position (~30%) may present with atypical symptoms like diarrhea or tenesmus, these positions are anatomical variants found across all age groups. They do not inherently explain the age-specific poor prognosis. **3. High-Yield Clinical Pearls for NEET-PG:** * **Elderly:** Often present with "silent" appendicitis (minimal pain/fever) due to a higher pain threshold and blunted immune response, leading to late presentation. * **Children:** Perforation rates are highest in those under 5 years old. * **Diagnosis:** In the elderly, always maintain a high index of suspicion for **Caecal Carcinoma** presenting as acute appendicitis. * **Classic Sequence:** Murphy’s triad (Pain, followed by Vomiting, then Fever).

Question 766: A 56-year-old woman has not passed stools for the last 14 days. X-ray shows no air-fluid levels. What is the probable diagnosis?

A. Paralytic ileus
B. Aganglionosis of the colon
C. Intestinal pseudo-obstruction (Correct Answer)
D. Duodenal obstruction

Explanation: ### Explanation **Correct Answer: C. Intestinal pseudo-obstruction** **Concept:** Intestinal pseudo-obstruction (specifically **Ogilvie’s Syndrome** when involving the colon) is a clinical syndrome characterized by signs and symptoms of mechanical obstruction without any physical lesion blocking the lumen. The key to this question lies in the **absence of air-fluid levels** on X-ray despite a long duration (14 days) of constipation. In mechanical obstruction, air and fluid separate, creating distinct levels. In pseudo-obstruction, there is massive gaseous distension of the bowel (usually the colon) but a lack of fluid accumulation or "staircase" patterns, as the pathology is related to autonomic nervous system imbalance rather than a physical blockage. **Why other options are incorrect:** * **Paralytic ileus:** While it also lacks mechanical obstruction, it typically presents with a "silent abdomen" and involves both the small and large intestines. On X-ray, it usually shows uniform gas distribution and **multiple air-fluid levels** (though fewer than mechanical obstruction). * **Aganglionosis (Hirschsprung Disease):** This is typically a pediatric diagnosis. While it causes chronic constipation, a 56-year-old presenting acutely/sub-acutely is highly unlikely to have undiagnosed Hirschsprung’s. * **Duodenal obstruction:** This would present with early-onset vomiting and a "double-bubble" sign on X-ray. It would not cause a 14-day cessation of stools without significant proximal symptoms. **NEET-PG High-Yield Pearls:** * **Ogilvie’s Syndrome:** Most commonly affects the cecum and right colon. It is often triggered by surgery, trauma, or metabolic imbalances (hypokalemia). * **Risk of Perforation:** In pseudo-obstruction, if the cecal diameter exceeds **10–12 cm**, the risk of perforation increases significantly (Laplace’s Law). * **Management:** Initial treatment is conservative (NG tube, electrolytes). If failing, **Neostigmine** (acetylcholinesterase inhibitor) is the pharmacological drug of choice. * **X-ray Tip:** Mechanical obstruction = Multiple air-fluid levels + Step-ladder pattern. Pseudo-obstruction = Massive gaseous distension + Minimal/No air-fluid levels.

Question 767: Which of the following is a manifestation of carcinoma of the stomach?

A. Troisier's sign
B. Trousseau's syndrome
C. Irish node
D. All of the above (Correct Answer)

Explanation: **Explanation:** Carcinoma of the stomach is known for its propensity to present with various paraneoplastic syndromes and signs of distant metastasis due to its aggressive nature and late clinical presentation. * **Troisier’s Sign (Option A):** This refers to the clinical finding of a palpable, hard, non-tender left supraclavicular lymph node (**Virchow’s node**). It indicates the spread of abdominal malignancy (most commonly gastric cancer) via the thoracic duct. * **Trousseau’s Syndrome (Option B):** This is a paraneoplastic manifestation characterized by **migratory thrombophlebitis**. It occurs due to the release of procoagulants (like mucin) from the adenocarcinoma, leading to recurrent blood clots in superficial veins at various sites. * **Irish Node (Option C):** This refers to the enlargement of the **left anterior axillary lymph node**, signifying lymphatic spread from a gastric malignancy. Since all three clinical features are recognized manifestations of advanced or metastatic gastric carcinoma, **Option D (All of the above)** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Sister Mary Joseph’s Nodule:** Palpable nodule at the umbilicus due to metastasis (most common in gastric, ovarian, or pancreatic cancer). * **Krukenberg Tumor:** Metastasis to the ovaries (classically showing signet ring cells). * **Blumer’s Shelf:** A shelf-like palpable mass in the rectovesical or rectouterine pouch (Pouch of Douglas) on rectal examination, indicating peritoneal drop metastasis. * **Acanthosis Nigricans:** A sudden, diffuse onset of velvety hyperpigmentation (especially in axilla) can be a paraneoplastic sign of gastric adenocarcinoma.

Question 768: Regarding abdominal cocoon, all statements are true except?

A. Common in young girls.
B. Associated with liver fibrosis. (Correct Answer)
C. Fibrosis of the small bowel and stomach.
D. Chronic peritonitis is seen.

Explanation: **Abdominal Cocoon (Sclerosing Encapsulating Peritonitis)** Abdominal cocoon is a rare condition characterized by the total or partial encasement of the small bowel by a thick, fibro-collagenous membrane, resembling a "cocoon." **Explanation of the Correct Answer (B):** There is **no established association between abdominal cocoon and liver fibrosis.** While secondary sclerosing peritonitis can occur in patients with end-stage renal disease on peritoneal dialysis or those taking certain medications (like practolol), it is not a feature of primary liver fibrosis or cirrhosis. This makes Option B the false statement. **Explanation of Incorrect Options:** * **Option A:** Primary (idiopathic) abdominal cocoon is most commonly seen in **young adolescent girls** from tropical and subtropical regions. It was historically hypothesized to be related to retrograde menstruation, though the exact etiology remains unknown. * **Option C:** The hallmark of the disease is the **fibrosis and encasement of the small bowel loops.** In some cases, this membrane can extend to involve the stomach, colon, and liver surface. * **Option D:** The condition is essentially a form of **chronic peritonitis** leading to the formation of a dense, opaque, greyish-white membrane. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Most commonly presents as recurrent episodes of acute or subacute **intestinal obstruction**, often with a palpable, non-tender soft abdominal mass. * **Diagnosis:** **CT Scan** is the gold standard investigation, showing the "cauliflower appearance" of clustered bowel loops encased in a thick membrane. * **Treatment:** The treatment of choice is **surgical excision of the membrane (decortication)** and adhesiolysis. Bowel resection is avoided unless the segment is non-viable. * **Secondary Causes:** Peritoneal dialysis (most common secondary cause), beta-blockers (practolol), sarcoidosis, and tuberculosis.

Question 769: In the Forrest classification, which of the following is NOT associated with a high risk of bleeding?

A. Visible vessel
B. Visible pulsatile bleeding
C. Adherent clot (Correct Answer)
D. Visible oozing from a vessel

Explanation: The **Forrest Classification** is a crucial endoscopic tool used to assess the risk of re-bleeding in peptic ulcer disease and to guide management. ### **Explanation of the Correct Answer** The correct answer is **C (Adherent clot)**. While an adherent clot (Forrest Grade IIb) does carry a risk of re-bleeding (approximately 20–30%), it is categorized as a **medium-risk** lesion. In contrast, active bleeding (Grade I) and a non-bleeding visible vessel (Grade IIa) are considered **high-risk** lesions that mandate immediate endoscopic intervention. ### **Analysis of Incorrect Options** * **B. Visible pulsatile bleeding (Grade Ia):** This represents an active arterial spurt. It has the highest risk of re-bleeding (up to 90%) and requires urgent hemostasis. * **D. Visible oozing from a vessel (Grade Ib):** This represents active venous or capillary oozing. It is a high-risk lesion with a re-bleeding rate of approximately 10–30% if left untreated. * **A. Visible vessel (Grade IIa):** This is a non-bleeding visible vessel. Despite the lack of active bleeding at the time of endoscopy, it carries a high risk of re-bleeding (40–50%) and requires prophylactic endoscopic treatment. ### **NEET-PG High-Yield Pearls** | Grade | Endoscopic Finding | Re-bleeding Risk | Management | | :--- | :--- | :--- | :--- | | **Ia** | Arterial spurting | High (90%) | Endoscopic Rx | | **Ib** | Oozing | High (10-30%) | Endoscopic Rx | | **IIa** | Visible vessel | High (40-50%) | Endoscopic Rx | | **IIb** | Adherent clot | Medium (20-30%) | Consider irrigation | | **IIc** | Flat spot (Hematin) | Low (5-10%) | Medical Rx | | **III** | Clean base ulcer | Very Low (<5%) | Medical Rx / Discharge | * **Management Tip:** Grades Ia, Ib, and IIa always require endoscopic therapy (e.g., clips, thermal, or dual therapy). Grade III ulcers can often be managed with oral PPIs and early discharge.

Question 770: All of the following statements about Esophageal carcinoma are true, EXCEPT:

A. More common in Men
B. Adenocarcinoma is on the rise
C. Most common in the elderly
D. Pernicious anemia is a risk factor (Correct Answer)

Explanation: **Explanation:** **1. Why Pernicious Anemia is the Correct Answer (The Exception):** Pernicious anemia is an autoimmune condition characterized by vitamin B12 deficiency due to a lack of intrinsic factor. It is a well-established risk factor for **Gastric Adenocarcinoma** and **Gastric Carcinoid tumors**, but it has **no clinical association with Esophageal Carcinoma**. Therefore, statement D is the false statement. **2. Analysis of Incorrect Options:** * **A. More common in Men:** True. Both Squamous Cell Carcinoma (SCC) and Adenocarcinoma show a strong male predilection (often cited as a 3:1 to 4:1 ratio). * **B. Adenocarcinoma is on the rise:** True. While SCC remains the most common type worldwide, the incidence of Adenocarcinoma is rapidly increasing in Western countries and urban India, primarily due to the rising prevalence of obesity and GERD (leading to Barrett’s Esophagus). * **C. Most common in the elderly:** True. Esophageal cancer is a disease of aging, with the peak incidence typically occurring in the 6th and 7th decades of life. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Globally, the middle third (SCC); for Adenocarcinoma, it is the lower third. * **Risk Factors for SCC:** Smoking, Alcohol, Achalasia Cardia, Tylosis (100% risk), Plummer-Vinson Syndrome, and Lye ingestion. * **Risk Factors for Adenocarcinoma:** GERD, Barrett’s Esophagus (metaplasia), Obesity, and Smoking. * **Investigation of Choice:** Upper GI Endoscopy (UGIE) with biopsy. * **Staging:** Endoscopic Ultrasound (EUS) is the most accurate for 'T' and 'N' staging.

Practice by Chapter

Esophageal Disorders

Practice Questions

Gastric Disorders

Practice Questions

Small Intestine Pathology

Practice Questions

Appendicitis

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Inflammatory Bowel Disease

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Intestinal Obstruction

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Diverticular Disease

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Anorectal Disorders

Practice Questions

Colorectal Neoplasms

Practice Questions

Gastrointestinal Stomas

Practice Questions

Bariatric Surgery Principles

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