Monarch Disease Ontology identifier MONDO_0006216 (gallbladder adenoma) is a polypoid epithelial neoplasm that arises from the gallbladder. According to the neoplastic growth pattern, it is classified as tubular, tubulopapillary, or papillary. Also known as: adenoma of gallbladder, adenoma of the gallbladder, gall bladder adenoma.