1. All of the following are characteristic of lymphocytic colitis, EXCEPT:

2. A 30 y/o male presents with dysphagia and “heart burn.” An EGD was performed and biopsies were obtained. Based on the histology what is the best diagnosis?

3. Based on the colon biopsy findings, what is the best diagnosis?

4. A 40 y/o female undergoes an EGD. Multiple nodules are noted in the stomach. Based on the images shown, what is the best diagnosis?

5. A 40 y/o HIV positive patient presents with diarrhea. Based on the histologic images, what is the best diagnosis?

6. A 36 y/o Mongolian woman presents with disseminated nodule on the peritoneum during an exploratory laporatomy. She has a past history of “stomach cancer” 10 years earlier. Representative images of the histology, including special stains, are shown. What is the best diagnosis?

7. Which of the following findings has the highest level of sensitivity in identifying gastroesophageal reflux disease?

8. All of the following organisms associated with infectious colitis are known to form true granulomas or microgranulomas EXCEPT:

9. Which of the following are characterized by diffuse active colitis?

10. A patient is found to have multiple small nodules during a colonoscopy. Histology showed a monomorphic infiltrate of small to intermediate sized lymphoid cells with an irregular nuclear membrane. Which of the following FISH studies would most likely be positive?