Typical location of hemorrhage in patient with hypertensive bleed

Patient also had fenestrated basilar artery as incidental finding.

Fenestration is the division of the arterial lumen into distinctly separate channels, each with its own endothelial and muscularis layers, while the adventitia may be shared.

It should be differentiated from complete duplication, where two distinct arteries have separated origins and with no distal arterial convergence.