MONDO_0000919 (ampulla of vater cancer) is a primary or metastatic malignant neoplasm involving the ampulla of Vater. Also known as: cancer of hepatopancreatic ampulla, hepatopancreatic ampulla cancer, malignant ampulla of Vater neoplasm, malignant ampulla of Vater tumor, malignant ampulla of Vater tumour, malignant hepatopancreatic ampulla neoplasm, malignant neoplasm of ampulla of Vater, malignant neoplasm of hepatopancreatic ampulla.