Classification of Gastric Carcinoid tumors

Gastric carcinoids are rare tumours. Clinical setting: -  Type I  - Associated with chronic atrophic gastritis with or without pernicious anemia. In autoimmune gastritis progressive destruction of the specialised parietal and chief cell zone leads to atrophy , intestinal metaplasia , hypochlorhydria and hypergastrinemia. - Type II - In Zollinger Ellison syndrome, particularly in patients associated with multiple endocrine neoplasia type 1.           - Type III - Sporadic tumours    - Not related to hypergastrinemia    - In the antrum or corpus    - Larger lesion, may be ulcerated.    - May have an aggressive course.

http://www.ncbi.nlm.nih.gov/pubmed/15362575