Fig 4.

Axial source (A and B) and coronal (C and D) reformatted CISS images at 1.5T (A and C) and 3T (B and D) of a patient with hemifacial spasm on the right side due a direct contact (black arrowheadwith white margins) between the VII-VIII nerve complex (long black arrow) and the meatal segment of the anterior inferior cerebellar artery (short white arrow), forming a loop near the nerve complex (short black and white arrows in A and B, in which the short black arrow indicates the proximal part and the short white arrow, the distal part of the anterior inferior cerebellar artery). In this patient, the NVC is approximately equally well seen at both field strengths.