Ampulla of Vater
Other malignancies

Author: Hanni Gulwani, M.D. (see Authors page)

Revised: 24 February 2016, last major update December 2012

Copyright: (c) 2003-2016,, Inc.

PubMed Search: Carcinoid[title]
Cite this page: Carcinoid. website. Accessed June 22nd, 2018.
Definition / general
Case reports
Microscopic (histologic) description
  • Classic features of carcinoid tumors; somatostatin producing tumors are often mucin+
Microscopic (histologic) images

Monotonous tumor cells with small round nuclei plus various images

Positive stains
  • Chromogranin (60%), synaptophysin (60%), gastrin (20% vs. 75% of duodenal carcinoids, Hum Pathol 2001;32:1252)
  • Also somatostatin and pancreatic polypeptide
Differential diagnosis
  • Adenocarcinoma
Additional references