A neoplasm with neuroendocrine differentiation that arises from the stomach. It includes well differentiated neuroendocrine tumors (low and intermediate grade) and poorly differentiated neuroendocrine carcinomas (high grade). The disease is MONDO_0003111 (gastric neuroendocrine neoplasm). Also known as: NET of stomach, neuroendocrine neoplasm of stomach, neuroendocrine neoplasm of the stomach, neuroendocrine tumor of the stomach, neuroendocrine tumour of the stomach, stomach NET, stomach neuroendocrine neoplasm, stomach neuroendocrine tumor.