Fig. 1From: Precocious puberty and Chiari I malformation with syrinx: a case report of an unusual presentation of Costello syndromeBrain 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 tonsilBack to article page