Carcinoid tumor Gastric carcinoid tumor 2024-07-01T13:30:04Z Originating from enterochromaffin-like cells, gastric carcinoid tumors are rare tumors that develop within the gastric mucosa. They can present as an isolated lesion or there can be multiple lesions. The tumor can invade locally into deeper structures of the gastrointestinal tract wall. Solitary gastric carcinoids have a greater chance for the development of malignancy and metastasis as compared to multiple gastric carcinoids due to hypergastrinemia.