患者女 ,44岁。体检Ｂ超发现左上腹部肿物 ,边界清晰 ,无恶心呕吐等不适感。查体 :未见阳性体征。ＣＴ示 :左上腹脾前胃外侧有一 5ｃｍ× 4ｃｍ× 3ｃｍ阴影 ,边界清。手术探查见肿物位于胃大弯浆膜层 ,与胃壁关系密切 ,但可分离 ,单纯切除肿物送检。病理检查　巨检 :囊性肿物 Female patient, 44 years old. The B-ultrasound on the physical examination found a mass in the left upper abdomen with clear boundaries and no discomfort such as nausea or vomiting. Physical examination: No positive signs. CT showed: The left upper abdomen had a 5cm×4cm×3cm shadow outside the stomach before the spleen, and the boundary was clear. Surgical exploration shows that the tumor is located in the gastric serosal layer, closely related to the stomach wall, but can be separated, and the tumor is simply removed for examination. Pathological examination Giant examination : Cystic mass