1. A 64 y/o male presents with chronic weight loss that is significant and unwanted. Chest X-ray and CT scans show infiltrates and a possible mass. The patient has no known history of immune suppression or steroid use. An EGD was performed due to difficulty swallowing and showed a 5cm stricture. This area was biopsied, and representative images are shown. Based on the findings, what is the best diagnosis?

2. Fundic gland polyps are associated with all of the following EXCEPT:

3. Which of the following is the most specific marker for a gastrointestinal stromal tumor?

4. A patient undergoes an EGD for non-specific abdominal pain. A nodule is found in the duodenum. Based on the histologic images, what is the most important diagnosis to consider?

5. Which of the following are true about gastric foveolar polyps?

6. All of the following are true with respect to “intramucosal carcinoma” of the colon EXCEPT:

7. All of the following are true about collagenous colitis, EXCEPT:

8. A 60 y/o male presents with a history of chronic diarrhea. Colonoscopy was performed with no significant findings. Random biopsies were obtained, which are shown for this case. Based on these findings, what is the best diagnosis?

9. A 67 y/o female presents with dysphagia and undergoes an EGD. Biopsies were performed and histologic images and appropriate immunohistochemical (IHC) stains are performed. Based on the findings, what is the IHC diagnostic of?

10. What is the best diagnosis, based on images for this case?