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CPAI的要点是：在MRI或增强CT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。