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a large calibered artery is seen arising from the superior-posterior aspect of the left cavernous ICA (which appears hypertrophied), this artery passes posteriorly and medially to form the basilar artery tip, with the latter is seen giving rise to the normal calibered both PCAs. The caudal basilar artery is atretic
hypoplastic distal vertebral arteries, more marked on the right side
normal calibres of the intra-cranial ICAs as well as both MCAs and ACAs, however both A2 segments unite forming a single trunk
no evidence of aneurysms or AV malformation