Basilar artery aneurysm
Left sided neck pain. Transiently decreased visual acuity in left eye.
Carotid CT Angiogram
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Basilar artery aneurysm with a maximal diameter of 23 mm. Dolichoectasia of the distal vertebral arteries (left more than right). Associated long segment non-occlusive thrombus within the proximal basilar artery, extending for approximately 28 mm.