Additional supporting information may be found in the online version of this article.

AJMA_33391_sm_SupplFig1.pdf222KFig. 1: Low axial images in one normal control (A) and three patients with Costello syndrome (B-D) show normal position of the cerebellar tonsils in the control (black arrows in A), and abnormal position with the tonsils wrapping around the medulla in the Costello patients (white arrows in B-D). These images come from subjects LR06-130 (A), ID#43- LR09-058 (B), ID# 13- LR08-409 (C) and ID# 255- LR08-284 (D).

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.