[en] This paper evaluates the effectiveness of dynamic CT in the diagnosis of gastric tumors, especially gastric cancer. Dynamic CT was prospectively performed in 34 patients with gastric tumors (30 gastric cancers, two malignant lymphomas, and two submucosal tumors) after intake of 400 mL water; CT results were compared with results of barium studies, endoscopy, and pathological examinations. As a normal control, 15 patients without gastric tumors were also examined with dynamic CT. Dynamic CT of a normal control revealed the gastric walls as two- or three-layered structures (multilayered pattern): a markedly enhanced inner layer, an intermediate layer of low attenuation, and (sometimes) an outer layer of slightly higher attenuation, which histologically corresponded to the mucosal layer, submucosal layer, and muscular-serosal layer, respectively