RT Journal Article SR Electronic T1 Significance of cerebellar tonsillar position on MR JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP S64 OP S68 DO 10.3174/ajnr.45-12.S64 VO 45 IS 12 YR 2024 UL http://www.ajnr.org/content/45/12/S64.abstract AB