Teenager with lightheadedness and dizziness when their head is turned to the right or the left

MRA of otational vertebral artery occlusion syndrome of the right vertebral artery
Coronal 3D MRA without contrast of the neck with the head turned to the left (above left) and right (below left) shows focal narrowing of the right vertebral artery V3 segment in both positions. Coronal 3D MRA with contrast with the neck in a neutral position (right) shows a normal appearance to the vertebral arteries.

The diagnosis was rotational vertebral artery occlusion syndrome of the right vertebral artery.