Fig. 1From: A case of severe headache attributed to vertebral artery dissection3T magnetic resonance imaging of the head. a T1-weighted images showed a high-signal intensity lesion (arrow) and narrowing of the residual signal void (arrowhead) of the left vertebral artery. b T2-weighted images showed a curvilinear high-signal structure and an intimal flap (arrow), suggesting left vertebral artery dissection and intramural hematoma. c and d Three-dimensional time-of-flight magnetic resonance angiography showed obstruction of the left vertebral artery (arrow), an aneurysm related to dissection of the right vertebral artery (arrowhead)Back to article page