Figure 2: (a) DSA image depicting basilar artery fenestration with corresponding. (b) Line diagram showing a fenestration of the BA, adjacent to the site of origin of the AICA, proximal to origins of SCA and PCA, distal to the origin of PICA. (c) Line of normal embryologic fusion along midline of two longitudinal neural arteries to form the basilar artery. DSA: Digital subtraction angiogram, BA: Basilar artery, AICA: Anterior inferior cerebellar artery, SCA: superior cerebellar artery, PCA: Posterior cerebral artery, PICA: Posterior inferior cerebellar artery