Principles of diagnosis: history of cerebral palsy, acquired gradually developed foot deformity, accompanied by regional paresthesia of leg or foot, spine X ray film shows bone deficit of vertebral arch and vertebral lamina.

• 诊断 :有脑瘫病史 ,后天渐发的足部畸形 ,伴有局限性皮肤感觉障碍 ,X线片见椎弓、椎板有骨缺损。