Bat wing 4th ventricle

Last revised by Ammar Ashraf on 14 Mar 2023

Bat wing 4th ventricle sign refers to the morphology of the fourth ventricle in the Joubert anomaly and related syndromes. The absence of a vermis with apposed cerebellar hemispheres gives the fourth ventricle an appearance reminiscent of a bat with its wings outstretched.

It is best demonstrated on an axial imaging plane and could be easily missed on sagittal and coronal images 3.

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