1临床资料患者,男,32岁。因发现右臀部肿块7年伴右小腿麻木3个月入院。7年前发现右臀部包块,偶有疼痛,推之不移动,逐渐增大,未予特殊治疗,3个月来感右小腿后侧麻木,以屈髋时明显。查体:一般情况良好,脊柱无畸形,右臀部可见凸出(图1),皮肤无异常,可触及5 cm×6 cm肿块,质地坚硬,无粘连,表面光滑,有压痛,基底固定不可推动, 1 clinical data patients, male, 32 years old. 7 years due to the discovery of right hip mass with right leg numbness 3 months admitted. 7 years ago, found that the right hip mass, occasionally pain, push it does not move, and gradually increased, no special treatment, 3 months after the numbness of the right calf to the hip flexion obvious. Physical examination: The general condition is good, the spine without deformity, visible bulge on the right buttocks (Figure 1), no abnormal skin, palpable 5 cm × 6 cm mass, hard texture, no adhesions, smooth surface, tenderness, fixed base can not be promoted ,