Illustrated diagram of cross-sectional midbrain. A - Unilateral right swallow-tail sign absence. Normal swallow-tail sign on the left. B - Bilateral absence of swallow-tail sign.
ADVERTISEMENT: Radiopaedia is free thanks to our supporters and advertisers.
Become a Gold Supporter and see no third-party ads.
By Section:
Updating… Please wait.
Unable to process the form. Check for errors and try again.
Thank you for updating your details.