Gastrointestinal Pathology — MCQs

A 54-year-old woman presents with complaints of abdominal fullness and early satiety. She denies a change in bowel habits and states that constipation is her normal state. A radiographic bowel series shows an 'apple core' lesion in her sigmoid colon. Which of the following markers is expected to be elevated in this patient?

Toxic megacolon is seen as a complication in which of the following conditions?

Among the following, the least malignant potential for colorectal cancer is seen in polyps associated with which syndrome?

Flask-shaped ulcers in a patient with dysentery are diagnostic of which condition?

A 68-year-old man has had "heartburn" and substernal pain after meals for 25 years. For the past year, he has had increased pain with difficulty swallowing both liquids and solids. On physical examination, there are no remarkable findings. Upper gastrointestinal endoscopy shows an ulcerated lower esophageal mass that nearly occludes the lumen of the esophagus. A biopsy specimen of this mass is most likely to show which of the following neoplasms?

What is the most common odontogenic cyst?

All of the following are significant risk factors for colonic carcinoma in an adenomatous polyp except?

A 50-year-old obese man (BMI =32 kg/m2) presents with indigestion after meals, bloating, and heartburn. Vital signs are normal. A CT scan of the abdomen reveals a hiatal hernia of the esophagus. Endoscopic biopsy shows thickening of the basal layer of the squamous epithelium, upward extension of the papillae of the lamina propria, and an increased number of neutrophils and lymphocytes. Which of the following is the most likely diagnosis?

A 20-year-old woman was diagnosed 8 years earlier with precocious pseudo-puberty secondary to an ovarian tumor. Physical examination reveals oral and lingual dark pigmentation. The patient also has multiple polyps throughout the gastrointestinal tract. Histopathological findings show polyps with arborization and pseudo-invasion. What is the most common site for these polyps?

All the following can cause GIT cancers except?