T1 sagittal pre gad T1 coronal pre gad T1 axial post gad

Diagnosis: Chiari I malformation with syrinx

Chiari I is a congenital anomaly where the cerebellar tonsils are herniated below the foramen magnum. More than 6mm of displacement before the age of 10 is considered abnormal. 20-40% of all patients with Chiari I have a syrinx. These patients often present with long tract signs suggestive of MS. Chiari I is also associated with basilar invagination (25-50%) , Klippel-Feil deformity (5-10%), and hydrocephalus (20-25%). There are no associations with myelomeningocele, heterotopias or Luckenschadel skull as in Chiari II. Related Cases

Dandy-Walker complex Chiari I malf. Chiari I malf.