Chiari 1.5 malformation

Case contributed by Dr Dalia Ibrahim

Presentation

Seizures.

Patient Data

Age: 20 years
Gender: Female
MRI

Cerebellar tonsillar herniation with caudal herniation of the obex of the medulla oblongata through the foramen magnum.

No evidence of hydrocephalus or syringohydromyelia.

Normal size and signal intensity of both hippocampi and amagdyla. No evidence of mesial temporal sclerosis.

Case Discussion

Chiari 1.5 malformation, or bulbar variant of Chiari I malformation, is a term used in the literature to describe the combination of cerebellar tonsillar herniation (as seen in Chiari I malformation) along with caudal herniation of some portion of the brainstem (often obex of the medulla oblongata) through the foramen magnum. It is considered a progression of Chiari I malformation.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.

Updating… Please wait.

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

 Thank you for updating your details.