title: Quiz case 1. Periosteal osteosarcoma (PO) of the mandible.
authors.forename: D M
authors.initials: DM
authors.lastname: Sorensen
authors.forename: M
authors.initials: M
authors.lastname: Gokden
authors.forename: A
authors.initials: A
authors.lastname: El-Naggar
authors.forename: R M
authors.initials: RM
authors.lastname: Byers
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D008339:Mandibular Neoplasms / Q000175:diagnosis*; D018217:Osteosarcoma, Juxtacortical / Q000175:diagnosis*