Investigation of ectopic recurrent skull base and cervical chordomas: The Institut Curie's proton therapy center experience.

Our study emphasizes an urgent need for prediction and early diagnosis of ectopic relapses in patients with cervical and skull base chordoma to improve accuracy of their aggressive treatments. © 2015 Wiley Periodicals, Inc. Head Neck 38: E1238-E1246, 2016.