Bat wing 4th ventricle

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 give 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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Article information

rID: 8242
Section: Signs
Synonyms or Alternate Spellings:
  • Bat wing fourth ventricle
  • Bat wing sign

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Cases and figures

  • Figure 1: fruit bat
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  • Case 1
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  • Case 2
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  • Case 3
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