Table 1. Chavda classification of the AICA vascular loop in the CPA cistern and IAC.

AICA = anterior inferior cerebellar artery; CPA = cerebellopontine angle; IAC = internal auditory canal

Type	Description
Type I	When the AICA loop is lying within CPA but not entering the IAC
Type II	When the AICA loop enters the IAC but does not extend >50% of the length of the IAC
Type III	When the AICA loop extends >50% of the IAC