LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY LIVING ART ENTERPRISES, LLC / SCIENCE PHOTO LIBRARY
This frontal view from a selective left vertebral angiogram shows a giant (>2.5 cm) aneurysm arising from the top of the basilar artery. This large saccular dilatation of the artery is abnormal and can lead to devastating neurologic disability or death, if it were to burst or rupture.
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