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Case 2 – persistent hypoglossal artery supplying an unfused BA with aneurysm. Clockwise from top left: CTA demonstrating basilar artery supply from hypoglossal artery arising from the right hypoglossal canal. Note right AICA reaching up to the right internal acoustic meatus; R CCA angiogram shows C2 origin of PHA feeding the basilar artery; oblique views demonstrating the unequal calibre of unfused channels and critical branches arising from them.
