患儿女,4.5岁。因颈部倾斜、疼痛、活动受限10d,于2005年12月13日收入院。入院时查体:方颅畸形,双眼斜视,头面部向左侧倾斜,枕颈部有压痛,头部左右旋转活动受限,吞咽和发音正常,四肢感觉、运动功能正常。颈椎侧位X线片示寰椎前移旋转脱位,Chamberlain氏征阳性(图1)。CT扫描示寰 Children with children, 4.5 years old. Due to neck tilt, pain, activity limited 10d, December 13, 2005 income hospital. Admission examination: square cranial deformity, binocular strabismus, head and face tilt to the left, pillow neck tenderness, limited rotation around the head, swallowing and sound properly, limbs feel, exercise function is normal. Cervical lateral X-ray showed atlas anterior rotation dislocation, Chamberlain’s syndrome was positive (Figure 1). CT scan shows atlas