On MRI or enhanced CT scans,invasion of the cerebello pontine angle was demonstrated as a soft tissue mass protruding posteriorly and/or superiorly from the petrous portion.

• 诊断 C P A I的要点是：在 M R I或增强 C T 片上，见岩锥或岩枕缝的后方或上方，有弧形的、能增强的软组织肿物侵入小脑脑桥角。