COMAT Surgery Examination Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. A 65-year-old male presents with progressive dysphagia for solids,
weight loss, and hoarseness. Endoscopy reveals a mass in the distal
esophagus. Which is the most likely diagnosis?
A. Adenocarcinoma
B. Squamous cell carcinoma
C. Gastroesophageal reflux disease
D. Achalasia
Answer: B. Squamous cell carcinoma
Rationale: Squamous cell carcinoma of the esophagus commonly affects
the middle to upper third of the esophagus and is associated with smoking
and alcohol use. Adenocarcinoma is more common in the distal esophagus
and often arises from Barrett’s esophagus.
, 2. A 45-year-old male presents with acute right lower quadrant pain,
nausea, and low-grade fever. Labs show leukocytosis. What is the
most appropriate next step?
A. MRI abdomen
B. CT abdomen and pelvis with contrast
C. Colonoscopy
D. Abdominal X-ray
Answer: B. CT abdomen and pelvis with contrast
Rationale: CT scan is the imaging modality of choice for suspected acute
appendicitis in adults due to high sensitivity and specificity.
3. A 70-year-old female with a history of chronic GERD presents with
progressive dysphagia. Endoscopy shows Barrett’s esophagus. Which
complication is she at greatest risk for?
A. Peptic ulcer
B. Esophageal adenocarcinoma
C. Esophageal varices
D. Achalasia
Answer: B. Esophageal adenocarcinoma
Rationale: Barrett’s esophagus is a metaplastic change of the distal
esophageal epithelium due to chronic acid exposure and increases the risk
of adenocarcinoma.
4. A patient with chronic liver disease presents with massive upper GI
bleeding. Endoscopy reveals dilated veins in the esophagus. Which is
, the most likely source?
A. Gastric ulcer
B. Esophageal varices
C. Mallory-Weiss tear
D. Dieulafoy lesion
Answer: B. Esophageal varices
Rationale: Esophageal varices result from portal hypertension in chronic
liver disease and are a common source of massive upper GI bleeding.
5. A 55-year-old male presents with painless jaundice and weight loss.
Imaging shows a mass in the head of the pancreas. What is the most
likely diagnosis?
A. Chronic pancreatitis
B. Pancreatic adenocarcinoma
C. Insulinoma
D. Pancreatic pseudocyst
Answer: B. Pancreatic adenocarcinoma
Rationale: Painless jaundice and weight loss in an older adult is classic for
pancreatic adenocarcinoma, especially when located in the head of the
pancreas.
6. A 30-year-old male presents with severe epigastric pain radiating to
the back. Labs show elevated serum amylase and lipase. What is the
most likely diagnosis?
A. Peptic ulcer disease
, B. Cholelithiasis
C. Acute pancreatitis
D. Gastritis
Answer: C. Acute pancreatitis
Rationale: Acute pancreatitis presents with epigastric pain radiating to the
back and elevated pancreatic enzymes (amylase and lipase).
7. Which of the following is the most common cause of small bowel
obstruction in adults?
A. Hernia
B. Crohn’s disease
C. Intussusception
D. Adhesions from prior surgery
Answer: D. Adhesions from prior surgery
Rationale: Postoperative adhesions are the leading cause of small bowel
obstruction in adults.
8. A patient presents with a painless, firm mass in the left breast.
Mammography confirms a suspicious lesion. What is the next best
step?
A. Fine-needle aspiration
B. Core needle biopsy
C. Excisional biopsy
D. Watchful waiting
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. A 65-year-old male presents with progressive dysphagia for solids,
weight loss, and hoarseness. Endoscopy reveals a mass in the distal
esophagus. Which is the most likely diagnosis?
A. Adenocarcinoma
B. Squamous cell carcinoma
C. Gastroesophageal reflux disease
D. Achalasia
Answer: B. Squamous cell carcinoma
Rationale: Squamous cell carcinoma of the esophagus commonly affects
the middle to upper third of the esophagus and is associated with smoking
and alcohol use. Adenocarcinoma is more common in the distal esophagus
and often arises from Barrett’s esophagus.
, 2. A 45-year-old male presents with acute right lower quadrant pain,
nausea, and low-grade fever. Labs show leukocytosis. What is the
most appropriate next step?
A. MRI abdomen
B. CT abdomen and pelvis with contrast
C. Colonoscopy
D. Abdominal X-ray
Answer: B. CT abdomen and pelvis with contrast
Rationale: CT scan is the imaging modality of choice for suspected acute
appendicitis in adults due to high sensitivity and specificity.
3. A 70-year-old female with a history of chronic GERD presents with
progressive dysphagia. Endoscopy shows Barrett’s esophagus. Which
complication is she at greatest risk for?
A. Peptic ulcer
B. Esophageal adenocarcinoma
C. Esophageal varices
D. Achalasia
Answer: B. Esophageal adenocarcinoma
Rationale: Barrett’s esophagus is a metaplastic change of the distal
esophageal epithelium due to chronic acid exposure and increases the risk
of adenocarcinoma.
4. A patient with chronic liver disease presents with massive upper GI
bleeding. Endoscopy reveals dilated veins in the esophagus. Which is
, the most likely source?
A. Gastric ulcer
B. Esophageal varices
C. Mallory-Weiss tear
D. Dieulafoy lesion
Answer: B. Esophageal varices
Rationale: Esophageal varices result from portal hypertension in chronic
liver disease and are a common source of massive upper GI bleeding.
5. A 55-year-old male presents with painless jaundice and weight loss.
Imaging shows a mass in the head of the pancreas. What is the most
likely diagnosis?
A. Chronic pancreatitis
B. Pancreatic adenocarcinoma
C. Insulinoma
D. Pancreatic pseudocyst
Answer: B. Pancreatic adenocarcinoma
Rationale: Painless jaundice and weight loss in an older adult is classic for
pancreatic adenocarcinoma, especially when located in the head of the
pancreas.
6. A 30-year-old male presents with severe epigastric pain radiating to
the back. Labs show elevated serum amylase and lipase. What is the
most likely diagnosis?
A. Peptic ulcer disease
, B. Cholelithiasis
C. Acute pancreatitis
D. Gastritis
Answer: C. Acute pancreatitis
Rationale: Acute pancreatitis presents with epigastric pain radiating to the
back and elevated pancreatic enzymes (amylase and lipase).
7. Which of the following is the most common cause of small bowel
obstruction in adults?
A. Hernia
B. Crohn’s disease
C. Intussusception
D. Adhesions from prior surgery
Answer: D. Adhesions from prior surgery
Rationale: Postoperative adhesions are the leading cause of small bowel
obstruction in adults.
8. A patient presents with a painless, firm mass in the left breast.
Mammography confirms a suspicious lesion. What is the next best
step?
A. Fine-needle aspiration
B. Core needle biopsy
C. Excisional biopsy
D. Watchful waiting
