患儿男,7天,因“先天性双侧前臂畸形伴双手拇指缺失,左手食指、中指融合”入院。患儿系第2胎第2产,足月剖宫产分娩,家中无类似病史。查体:双侧前臂短小弯曲,桡骨缺失,腕关节向尺骨桡侧完全脱位,手指与尺骨纵轴成角畸形,双手拇指缺失,左手食指、中指融合,右手食指、双手小指明显屈曲挛缩,双手大鱼际肌缺失(图1)。双上肢X线:双 Children, male, 7 days, due to “congenital bilateral forearm deformity with hands thumb loss, left index finger, middle finger fusion ” admission. The second child in the second line of children, cesarean section delivery, no similar home history. Physical examination: short forearm bilateral flexion, radial absence, complete dislocation of the wrist to the radial ulnar, the angle between the finger and the longitudinal axis of the ulna deformity, missing both hands and thumb, left index finger, middle finger fusion, right index finger, both fingers obvious flexion contracture, Great attic muscle loss (Figure 1). Double upper extremity X-ray: double