Muinous gastric carcinoma (MGC) is a rare histological type that accounts for approximately 3∼7% of all gastric carcinomas. The results of clinicopathological studies suggest that the overall survival rate for patients with MGC is worse than that for patients with non-mucinous tumors as MGC is more frequently diagnosed in the advanced stage. In this report, we preoperatively predicted the type of a tumor from its endoscopic finding. An endoscopic ultrasonographic examination showed a submucosal tumor like mass showing mucin waterfall on the gastric cardia. A total gastrectomy with splenectomy was performed. The pathology of the tumor identified the lesion as a mucinous adenocarcinoma. (Korean J Gastrointest Endosc 2008;36:87-91)