单纯性骨囊肿(simple bone cyst,SBC)又名单房性骨囊肿(unicameral bone cyst,UBC),是一种好发于儿童和青少年长骨干骺端的骨组织良性瘤样病变,94%发生于肱骨及股骨近端~[1],其发病原因不明。我院收治1例发病不足8个月的婴儿肱骨近端巨大SBC病例,现报道如下。临床资料患儿,女,11个月。主因发现左上臂肿物疼痛伴活动障碍3个月余入院。于3个月前发现左上臂近端软组织 Simple bone cyst (SBC), also known as unicameral bone cyst (UBC), is a benign tumor-like lesion of bone tissue that occurs in the metaphysis of long bones in children and adolescents. 94% occur in the humerus And the proximal femur ~ [1], its etiology is unknown. A hospital admitted to our hospital less than 8 months incidence of proximal humerus huge cases of SBC are reported below. Clinical data of children, female, 11 months. The main cause of the pain was found in the left upper arm with mobility disorder more than 3 months admitted to hospital. The left upper arm proximal soft tissue was found 3 months ago