Depending on the lesion, the clivus, the anterior arch of the atlas, the dens, and bodies of C2 and C3 may be removed with a drill and rongeurs.

• 视病变情况，斜坡、寰枕前弓、齿状突、C2、C3椎体可以用磨钻或咬骨咬骨钳切除。