Dysplastic distal basilar artery system associated with a dolicho internal carotid artery: case report.

Dysplasia of the basilar artery (BA) is a rare anatomic varint. Ontogenetically, the distal BA and proximal posterior cerebral rtery (PCA) arise from the caudal division of the embryonic interal carotid artery (ICA) [1]. We report a patient with a dysplastic istal BA and unilateral proximal PCA associatedwith an ipsilateral olicho ICA. To the best of our knowledge, this is the first docmentation of a congenital anatomic variation explicable by the evelopmental history of the distal BA and proximal PCA.