Fig. 1

Brain MRI at 9 years 10 months, structures as labeled. Depicted is a Chiari I malformation with a syrinx at C1-C4. a Basion, b Syrinx, c Opisthion, d Low lying cerebellar tonsil
Brain MRI at 9 years 10 months, structures as labeled. Depicted is a Chiari I malformation with a syrinx at C1-C4. a Basion, b Syrinx, c Opisthion, d Low lying cerebellar tonsil