Dolichoectasia of the V4 segment of the left vertebral artery.
The left abducent nerve has the most intimate relation to the dilated artery, however no compression is seen on oblique MPR T2 image.
Bright signal seen within the left VA on filtered phase SWI, suggesting underlying atherosclerotic calcification.
Indentation and compression to the medulla and cervico-medullary junction by the dilated tortuous vessel.
Dilated V4 segment of the left VA reaching 5.5 mm.