Carcinoids of the jejunum and ileum: an immunohistochemical and clinicopathologic study of 167 cases.

Abstract

Jejunoileal carcinoid tumors have a relatively high rate of transmural invasion and aggressive clinical behavior. They are usually insular and largely argentaffin, with a high rate of chromogranin and serotonin positivity. These features differentiate jejunoileal carcinoids from other gastrointestinal carcinoids.