title: Sacral chordoma: challenging for resection margin.
authors.affiliation: Department of Surgery, Kosin University College of Medicine, Busan, Korea.
authors.forename: Seung-Hyun
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Department of Surgery, Kosin University College of Medicine, Busan, Korea.
authors.forename: Byung-Kwon
authors.initials: BK
authors.lastname: Ahn