Low power view of a gastric carcinoid reveals sheets of poorly differentiated tumors cells with areas of necrosis (arrow).
* All neuroendocrine tumors of the GI tract, including gastric carcinoids, are graded as grade 1, 2, or 3 (large cell or small cell type neuroendocrine carcinoma) based on the mitotic count and/or the Ki67 proliferation index.
From Lewin KJ, Appelman HD. Tumors of the esophagus and stomach. Atlas of tumor pathology (electronic fascicle), Third series, fascicle 18, 1996, Washington, DC. Armed Forces Institute of Pathology.