title: [Osteosarcomatous dedifferentiated chondrosarcoma].
abstract: A secondary peripheral chondrosarcoma (SPC) evolving from an osteochondroma is rare, but it has been described several times. The development of an osteosarcomatous dedifferentiated chondrosarcoma in a locally recurrent SPC is extremely rare. The following case report of a 46-year-old man demonstrates and discusses this phenomenon.
authors.affiliation: Sarkomzentrum Berlin-Brandenburg, Zentrum für Orthopädie und Unfallchirurgie, HELIOS Klinikum Berlin-Buch, Schwanebecker Chaussee 50, 13125, Berlin, Deutschland. per-ulf.tunn@helios-kliniken.de.
authors.forename: P-U
authors.initials: PU
authors.lastname: Tunn
authors.affiliation: Institut für Gewebediagnostik Berlin, Medizinisches Versorgungszentrum, HELIOS Klinikum Emil von Behring, Walterhöferstr. 11, 14165, Berlin, Deutschland.
authors.forename: M
authors.initials: M
authors.lastname: Werner
mesh_terms: D001859:Bone Neoplasms / Q000175:diagnosis* / Q000601:surgery; D002813:Chondrosarcoma / Q000175:diagnosis* / Q000601:surgery; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D016609:Neoplasms, Second Primary / Q000175:diagnosis* / Q000601:surgery; D012516:Osteosarcoma / Q000175:diagnosis* / Q000601:surgery
keywords: Exostosis; Local recurrence; Neoplasm grading; Neoplastic cell transformation; Second primary neoplasms