carcinoma in situ of gastric cardia (Monarch Disease Ontology entry MONDO_0021294) is a in situ carcinoma that involves the cardia of stomach. Also known as: carcinoma in situ of cardia of stomach, carcinoma in situ of the cardia of the stomach, carcinoma in situ of the gastric cardia, cardia of stomach carcinoma in situ, cardia of stomach in situ carcinoma, gastric cardia carcinoma in situ, gastric cardia carcinoma in situ aJCC v6 and v7, stage 0 cardia of stomach carcinoma.