Butterfly sign (choroid plexus)

Last revised by Frank Gaillard on 28 Apr 2024

The butterfly sign refers to the normal appearance of the choroid plexuses on axial imaging of the fetal brain, commonly observed on the antenatal ultrasound. Its absence may suggest holoprosencephaly 1.

In the CNS, the term should not be confused with a butterfly glioma, which is a glioblastoma that crosses the midline via the corpus callosum, observed in a different age group. 

ADVERTISEMENT: Supporters see fewer/no ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.