Slide 4 
These nests are composed of closely packed, very uniform round cells with small, centrally located nuclei which show little pleomorphism, hyperchromasia, or mitotic activity. The cytoplasm is slightly eosinophilic or amphophilic, but cell borders are often indistinct.

Slide 5
At higher power note the lack of cytologic pleomorphism and mitotic activity. It is important to remember that the biologic behavior of carcinoids cannot be assessed histologically. Despite their innocuous cytologic appearance, it is not unusual for GI carcinoids to involve all coats of the bowel wall and to metastasize to distant organs, particularly the liver.