Abstract
A case of gastric serosal cyst diagnosed preoperatively is reported. The patient was a 43-year-old man, who had suffered from mild abdominal pain after drinking for the past ten years. A cystic lesion between the stomach and the pancreas was formed by abdominal ultrasound examination. The cystic lesion was 4×2.2 cm in size with a oval shape. Endoscopic ultrasonography demonstrated each gastric layer adjacent to the cystic lesion was intact, and the cystic lesion was clearly marginated from the pancreas. ERCP and enhanced CT scan revealed no connection between the cystic lesion and the common bile duct, the pancreatic ducts, or blood vessels. From these observations, a peritoneal cyst between the stomach and the pancreas was suspected. An exploratory laparotomy demonstrated an unilocular gastric serosal cyst, 3×4×5 cm in size, with a serous content. Although peritoneal cysts are rarely found and seldom diagnosed prior to operation, the preoperative diagnosis was possible in the present case. The ultrasonographic examinations, especially the endoscopic ultrasonography appeared to be useful and most potent to establish the diagnosis.
