Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Non-contrast CT image of the brain shows (a) a hyperdense basilar artery (arrow) and (b) hyperdense left vertebral artery (arrow) of a patient who presented with cerebellar stroke. (c) Time-of-flight MR angiogram shows absence of flow signal in the left vertebral artery and basilar artery. The right vertebral artery terminates as the posterior inferior cerebellar artery, which is a normal variant.
