Fetal rhombencephalosynapsis

Case contributed by Dr Alexandra Stanislavsky


Suspected cerebellar dysgenesis/hypoplasia on second trimester ultrasound.

Patient Data

Age: 25W 2D GA
Gender: Female

There is no evidence of a normal vermis.  Instead, the cerebellar hemispheres are closely opposed to one another. The cerebellum has a ball shape, typical for rhombencephalosynapsis. In addition, the morphology of fourth ventricle is abnormal. Instead of being an equilateral triangle, it has a rounded appearance and is much larger than normal. 

Case Discussion

Typical features of rhombencephalosynapsis on fetal MRI.

PlayAdd to Share

Case information

rID: 52228
Published: 12th Apr 2017
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

Updating… Please wait.

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

 Thank you for updating your details.