High resolution air CT meatography: the demonstration of normal and abnormal structures in the cerebello-pontine cistern and internal auditory meatus

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Abstract
Thin-section computed tomography with small quantities of air introduced by lumbar puncture can show the VIIth and VIIIth cranial nerves as well as the vascular loop of the anterior inferior cerebellar artery in the cerebello-pontine angle and internal auditory meatus. Filling of the meatus with air seems a reliable sign to exclude the presence of an acoustic neuroma, as well as demonstrating vascular anomalies as a possible cause of non-filling with iophendylate.