Gastrointestinal Surgery Practice Questions

Q: A patient presents with a history of abdominal pain. On examination, the person is in shock, with severe abdominal tenderness and guarding. There was also one episode of bloody diarrhea. He gives a history of recurrent abdominal pain soon after taking food which persists for about 3 hours after food. He also has a history of myocardial infarction about 5 years back. What is your diagnosis?

Acute thrombotic mesenteric vascular occlusion. **Explanation:** The clinical presentation points toward **Acute Mesenteric Ischemia (AMI)**, specifically **Acute Thrombotic Mesenteric Vascular Occlusion**. 1. **Why it is correct:** The patient has a classic history of **"Intestinal Angina"** (recurrent post-prandial abdominal pain lasting 1–3 hours), which indicates pre-existing atherosclerotic narrowing of the mesenteric vessels. The sudden progression to shock, severe tenderness (indicating bowel infarction/peritonitis), and **bloody diarrhea** (sloughing of ischemic mucosa) are hallmarks of acute occlusion. His history of myocardial infarction confirms a systemic atherosclerotic profile, a major risk factor for mesenteric thrombosis. 2. **Why the others are incorrect:** * **Acute Pancreatitis:** While it causes severe pain and shock, it does not typically present with bloody diarrhea or a specific history of post-prandial "angina" pain. * **Acute Duodenal Ulcer Perforation:** This presents with sudden "board-like" rigidity. While pain may be related to food, it usually improves with food (in DU) and does not cause bloody diarrhea. * **Acute Appendicitis:** This typically presents with migratory pain to the right iliac fossa and fever, not systemic shock and bloody diarrhea in the early stages. **Clinical Pearls for NEET-PG:** * **Classic Triad of AMI:** Severe abdominal pain out of proportion to physical findings (early), gut emptying (vomiting/diarrhea), and a source of emboli (AFib) or thrombus (Atherosclerosis). * **Gold Standard Investigation:** CT Angiography. * **Early Sign on X-ray:** Usually normal; late signs include "Thumbprinting" (mucosal edema) or Pneumatosis intestinalis. * **Most common site:** Superior Mesenteric Artery (SMA).

Q: What is true about choledochal cysts?

Excision is the ideal treatment. **Explanation:** Choledochal cysts are congenital cystic dilatations of the biliary tree. The management of these cysts has evolved significantly, focusing on the prevention of long-term complications. **1. Why "Excision is the ideal treatment" is correct:** The gold standard treatment for choledochal cysts (specifically Type I and IV) is **complete surgical excision of the cyst** followed by biliary reconstruction, typically via a **Roux-en-Y Hepaticojejunostomy**. The primary medical rationale is the high risk of **cholangiocarcinoma** (malignant transformation) arising from the cyst wall due to chronic inflammation and reflux of pancreatic enzymes. Simple drainage does not remove this premalignant tissue. **2. Why the other options are incorrect:** * **Option A:** Choledochal cysts are **not always extrahepatic**. According to the **Todani Classification**, Type IVa involves both intrahepatic and extrahepatic ducts, and Type V (Caroli’s disease) is limited to the intrahepatic ducts. * **Option B & D:** Internal drainage procedures like **Cystojejunostomy** or simple drainage are now considered obsolete and **incorrect**. These procedures leave the cyst wall intact, leading to recurrent cholangitis, stone formation, and a significantly high risk of future malignancy in the cyst remnant. **High-Yield Clinical Pearls for NEET-PG:** * **Todani Classification:** Most common type is **Type I** (Saccular or fusiform dilatation of the CBD). * **Classic Triad:** Jaundice, right upper quadrant pain, and a palpable mass (seen in only 20% of cases, mostly children). * **Etiology:** Often associated with an **Anomalous Pancreaticobiliary Duct Junction (APBDJ)**, allowing pancreatic juice to reflux into the CBD. * **Investigation of Choice:** **MRCP** is the gold standard for diagnosis and anatomical mapping.

Q: What is the treatment of choice for fistula in ano?

Fistulotomy. **Explanation:** The primary goal in treating a fistula-in-ano is to eradicate the track while preserving anal sphincter function. **1. Why Fistulotomy is the Correct Answer:** **Fistulotomy** is considered the gold standard and treatment of choice for most simple (low) fistulae. It involves laying the fistula track open by cutting the overlying skin and muscle, allowing the wound to heal by secondary intention from the base upwards. It has a high success rate and a lower risk of fecal incontinence compared to more radical procedures. **2. Analysis of Incorrect Options:** * **Anal Dilatation (Lord’s Procedure):** This is historically used for hemorrhoids or anal fissures to reduce sphincter hypertonia; it has no role in treating a fistulous track. * **Fissurotomy:** This is the surgical treatment for a chronic anal fissure, not a fistula. * **Fistulectomy:** This involves the complete excision of the fistula track. While effective, it creates a larger wound, takes longer to heal, and carries a significantly higher risk of damaging the anal sphincters, leading to incontinence. Therefore, it is generally less preferred than fistulotomy. **3. Clinical Pearls for NEET-PG:** * **Goodsall’s Law:** Predicts the track of the fistula. If the external opening is **anterior** to a transverse line through the anus, the track is straight. If **posterior**, the track is curved and opens in the midline (Exception: Anterior openings >3cm from the anus also follow a curved posterior track). * **Park’s Classification:** Categorizes fistulae into Intersphincteric (most common), Transsphincteric, Suprasphincteric, and Extrasphincteric. * **Seton Placement:** Used for "complex" or "high" fistulae where a fistulotomy would risk major incontinence. * **Most common cause:** Cryptoglandular infection (infection of the anal glands).

Q: Duodenal blow out following Billroth gastrectomy most commonly occurs on which day?

4th day. **Explanation:** **Duodenal Blowout** is a serious complication following a Billroth II gastrectomy or Polya gastrectomy, characterized by the disruption of the duodenal stump closure. 1. **Why the 4th day is correct:** The duodenal stump is most vulnerable between the **4th and 6th postoperative days**. During this period, the initial surgical sutures lose their tensile strength due to the natural inflammatory phase of wound healing, while the deposition of new collagen (proliferative phase) has not yet provided sufficient structural integrity. Additionally, increased intraluminal pressure from afferent loop obstruction or local accumulation of bile and pancreatic juices can lead to dehiscence. Statistically, the 4th day is the peak time for this clinical presentation. 2. **Analysis of incorrect options:** * **2nd day:** This is too early for tissue necrosis or suture failure; any leak at this stage is usually due to a major technical error rather than biological healing failure. * **6th day:** While leaks can occur on the 6th day, the 4th day is the classic "textbook" peak for the onset of symptoms. * **12th day:** By this time, the proliferative phase of healing is well underway, and the stump is generally secure unless there is a significant distal obstruction or severe malnutrition. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Sudden onset of severe upper abdominal pain, tachycardia, and signs of peritonitis (guarding/rigidity) in a patient recovering from gastrectomy. * **Management:** This is a surgical emergency. The treatment of choice is immediate re-exploration, peritoneal lavage, and **tube duodenostomy** (converting the blowout into a controlled lateral fistula). * **Prevention:** Ensuring a tension-free closure and avoiding afferent loop syndrome are key preventive measures.

Q: A young patient presents with a history of dysphagia, more to liquids than solids. What is the first investigation you will perform?

Barium Swallow. **Explanation:** The clinical presentation of **dysphagia more to liquids than solids** is a classic hallmark of a **motility disorder**, most commonly **Achalasia Cardia**. In contrast, mechanical obstructions (like strictures or malignancy) typically present with dysphagia to solids first, progressing to liquids. **1. Why Barium Swallow is the Correct Answer:** Barium swallow is the **initial investigation of choice** for dysphagia. It provides a "road map" of the esophagus, helping to differentiate between structural and functional causes. In Achalasia, it classically shows the **"Bird’s Beak" appearance** (tapering of the lower esophageal sphincter with proximal dilatation). It is non-invasive and helps the clinician avoid accidental perforation during a subsequent endoscopy if a large diverticulum (like Zenker’s) is present. **2. Why other options are incorrect:** * **Esophagoscopy:** While it is the most important investigation to **rule out malignancy** (pseudo-achalasia) and is mandatory before treatment, it is usually the second step. It is invasive and may miss subtle motility patterns. * **Ultrasound of the chest:** This has no diagnostic role in evaluating the lumen or motility of the esophagus. * **CT Scan of the chest:** This is used for staging esophageal cancer but is not a primary screening tool for dysphagia or motility disorders. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows incomplete relaxation of LES and aperistalsis). * **Most Common Symptom:** Dysphagia to both solids and liquids (paradoxical dysphagia). * **Heller’s Myotomy:** The surgical treatment of choice. * **Rule of Thumb:** For any dysphagia, **Barium Swallow** is the first/initial test, while **Endoscopy** is the best test to rule out cancer.

Q: Which of the following is NOT true about achalasia?

Body peristalsis is normal.. **Explanation:** Achalasia cardia is a primary esophageal motility disorder characterized by the degeneration of the inhibitory neurons in the **myenteric (Auerbach’s) plexus**. This leads to a failure of the Lower Esophageal Sphincter (LES) to relax and a complete loss of organized peristalsis. **1. Why Option B is the correct answer (The False Statement):** In achalasia, the hallmark of the disease is **aperistalsis** (absence of peristalsis) in the distal two-thirds of the esophageal body. The smooth muscle fibers fail to coordinate, leading to simultaneous, non-propulsive contractions. Therefore, saying "body peristalsis is normal" is medically incorrect. **2. Analysis of other options:** * **Option A (Predisposes to malignancy):** Chronic stasis of food leads to esophagitis and mucosal changes. Patients have a significantly increased risk (approx. 15–30 times) of developing **Squamous Cell Carcinoma**. * **Option C (LES pressure is increased):** Due to the loss of inhibitory neurotransmitters (Nitric Oxide and VIP), the LES remains in a state of tonic contraction. Resting LES pressure is typically **>30 mmHg**. * **Option D (Dilatation of the proximal segment):** Chronic distal obstruction causes the esophagus to dilate proximally to accommodate retained food, eventually leading to a "sigmoid esophagus" appearance. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Esophageal Manometry (shows aperistalsis and incomplete LES relaxation). * **Barium Swallow Sign:** "Bird’s Beak" or "Rat-tail" appearance. * **Triad of Achalasia:** 1. Incomplete LES relaxation, 2. Increased LES tone, 3. Aperistalsis. * **Treatment of Choice:** Laparoscopic Heller’s Myotomy with partial fundoplication (Dor or Toupet). * **Chagas Disease:** A common cause of secondary achalasia (pseudoachalasia) globally.

Q: What is the most common site of Curling's ulcer?

Proximal Duodenum. **Explanation:** **Curling’s ulcer** is a type of stress-induced acute peptic ulcer that occurs as a complication of severe **burns**. The underlying pathophysiology involves severe hypovolemia and hemoconcentration, leading to reduced mucosal blood flow (ischemia) in the gastrointestinal tract. This ischemia impairs the protective mucosal barrier, allowing gastric acid to cause acute erosions and ulceration. * **Why Option A is Correct:** The **proximal duodenum** (specifically the first part) is the most common site for Curling’s ulcers, though they can also occur in the stomach. These ulcers are often deep and have a high propensity for perforation or severe hemorrhage. * **Why Options B, C, and D are Incorrect:** While stress ulcers can occasionally involve the esophagus or distal small bowel in extreme systemic shock, these are not the characteristic sites. The jejunum and distal duodenum are rarely involved because the primary insult is acid-peptic in nature, which predominantly affects the gastroduodenal mucosa. **Clinical Pearls for NEET-PG:** * **Curling vs. Cushing:** Remember the mnemonic: **C**urling is for **B**urns (think "Curling iron" causes burns); **C**ushing is for **I**ntracranial pressure (associated with brain tumors or head trauma). * **Cushing’s Ulcer:** Unlike Curling’s, Cushing’s ulcers are caused by vagal overstimulation leading to gastric acid hypersecretion and are more commonly found in the **stomach**. * **Prophylaxis:** In modern burn units, the incidence of Curling’s ulcer has significantly decreased due to aggressive fluid resuscitation and the routine use of H2 blockers or Proton Pump Inhibitors (PPIs).

Q: All of the following are true about Retained Antrum Syndrome except:

Positive Secretin Stimulation Test. **Explanation:** **Retained Antrum Syndrome (RAS)** occurs when a portion of the gastric antrum is inadvertently left behind attached to the duodenal stump following a **Billroth II gastrectomy**. Because this antral tissue is no longer exposed to acidic gastric contents, the G-cells are constantly stimulated to release **Gastrin**, leading to hypergastrinemia and recurrent stomal ulcers. 1. **Why Option C is the correct answer (False statement):** In RAS, the **Secretin Stimulation Test is negative** (gastrin levels decrease or remain stable). In contrast, a **Positive Secretin Test** (paradoxical rise in gastrin >200 pg/mL) is the hallmark of a **Zollinger-Ellison Syndrome (Gastrinoma)**. This is the primary clinical method used to differentiate between the two conditions. 2. **Analysis of other options:** * **Option A:** **Technetium 99m pertechnetate scan** is the diagnostic imaging of choice as it is taken up by the ectopic gastric mucosa in the duodenal stump. * **Option B:** It is specifically seen after **Billroth II** reconstruction because the duodenal stump is excluded from the food stream and acid flow. * **Option D:** The **Calcium Provocation Test** is typically **negative** or shows a minimal rise in RAS, whereas it shows a significant increase in Gastrinoma. **High-Yield Clinical Pearls for NEET-PG:** * **Pathophysiology:** Loss of feedback inhibition of G-cells due to alkaline environment in the duodenum. * **Differential Diagnosis:** Always differentiate RAS from Gastrinoma using the Secretin Test. * **Treatment:** Surgical excision of the residual antral stump (often performed laparoscopically). * **Key Distinction:** * **RAS:** Secretin test (-), Tc-99m scan (+). * **Gastrinoma:** Secretin test (+), Tc-99m scan (-).

Question 1

Which of the following is NOT a characteristic of malignant gastric ulcers?

Accepted Answer

Ulcer extends beyond the gastric wall.

Answer

Mucosal rugae stop far from the ulcer.

Answer

Eccentric crater.

Answer

Margins are raised.

Question 2

A patient presents with a history of abdominal pain. On examination, the person is in shock, with severe abdominal tenderness and guarding. There was also one episode of bloody diarrhea. He gives a history of recurrent abdominal pain soon after taking food which persists for about 3 hours after food. He also has a history of myocardial infarction about 5 years back. What is your diagnosis?

Accepted Answer

Acute thrombotic mesenteric vascular occlusion

Answer

Acute pancreatitis

Answer

Acute duodenal ulcer perforation

Answer

Acute appendicitis

Question 3

What is true about choledochal cysts?

Accepted Answer

Excision is the ideal treatment

Answer

Always extrahepatic

Answer

Treatment is cystojejunostomy

Answer

Drainage is the treatment of choice

Question 4

An appendicular fistula is least likely to heal if?

Accepted Answer

There is stenosis or narrowing of the sigmoid colon

Answer

The stump was sutured with vicryl

Answer

There is superadded infection

Answer

None of the above

Question 5

What is the treatment of choice for fistula in ano?

Accepted Answer

Fistulotomy

Answer

Anal dilatation

Answer

Fissurotomy

Answer

Fistulectomy

Question 6

Duodenal blow out following Billroth gastrectomy most commonly occurs on which day?

Accepted Answer

4th day

Answer

2nd day

Answer

6th day

Answer

12th day

Question 7

A young patient presents with a history of dysphagia, more to liquids than solids. What is the first investigation you will perform?

Accepted Answer

Barium Swallow

Answer

Esophagoscopy

Answer

Ultrasound of the chest

Answer

CT Scan of the chest

Question 8

Which of the following is NOT true about achalasia?

Accepted Answer

Body peristalsis is normal.

Answer

It predisposes to malignancy.

Answer

Lower esophageal sphincter (LES) pressure is increased.

Answer

There is dilatation of the proximal segment.

Question 9

What is the most common site of Curling's ulcer?

Accepted Answer

Proximal Duodenum

Answer

Esophagus

Answer

Distal duodenum

Answer

Jejunum

Question 10

All of the following are true about Retained Antrum Syndrome except:

Accepted Answer

Positive Secretin Stimulation Test

Answer

Technetium 99m scan is used for diagnosis

Answer

Seen after Billroth II surgery

Answer

Calcium Provocation test is negative

Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery — MCQs

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