A gastrin-producing neuroendocrine tumor. It is usually located in the pancreas but it is also found at other anatomic sites, including the stomach and small intestine. The disease is MONDO_0003523 (gastrin-producing neuroendocrine tumor). Also known as: G cell tumor, G cell tumour, G-cell gastrin producing tumor, G-cell gastrin producing tumour, G-cell tumor, G-cell tumour, gastrin cell tumor, gastrin cell tumour.