A variant of gastric adenocarcinoma with exophytic growth and elongated finger-like processes lined by cylindrical or cuboidal cells supported by fibrovascular connective tissue cores. The disease is gastric papillary adenocarcinoma (Monarch Disease Ontology term MONDO_0006228). Also known as: papillary adenocarcinoma of stomach, papillary adenocarcinoma of the stomach, stomach papillary adenocarcinoma.