The V4 segment is the intracranial vessel that joins the contralateral vertebral artery to form the basilar artery. This segment is infrequently affected by atherosclerosis, but is vulnerable to ...
Background: Vertebral artery dissection (VAD ... Subarachnoid hemorrhage was seen only with intracranial dissections (57% vs. 0%, P=0.003). Fewer than half of the patients had obvious trauma ...