Abstract
A 79-years-old male with epigastralgia was admitted. Endoscopic and ultrasonogra-phic examination revealed four gastric carcinomas and thickness of the gastric wall. Macroscopic and histological examination of the resected specimen confirmed synchronous five early gastric carcinomas combined with wall thickness due to diffuse submucosal cysts. Stomach including diffuse submucosal cysts is known to co-exist often with mutiple gastric carcinomas. However, we are sure that this case of five synchronous early gastric carcinomas co-existing with diffuse submucosal cysts is extremely rare.