title: Pseudoanaplastic chondromyxoid fibroma.
abstract: A 19-year-old man presented with a chondromyxoid fibroma of the distal phalanx of the great toe that was originally diagnosed as osteosarcoma rather than "dedifferentiated" chondrosarcoma. Radiographs showed a large, expansive, and calcified tumor of the distal phalanx. Although the tumor had the architectural and matrix patterns of a chondromyxoid fibroma, high-power examination demonstrated that the lesion had such severe nuclear pleomorphism that it was mistaken for high-grade sarcoma. The purpose of this report is to present the criteria used to differentiate a benign pseudoanaplastic chondromyxoid fibroma from chondrogenic high-grade sarcomas.
authors.affiliation: Orthopaedic Oncology, Orthopaedic Hospital, Los Angeles, CA, USA.
authors.forename: W J
authors.initials: WJ
authors.lastname: Bahk
authors.forename: J M
authors.initials: JM
authors.lastname: Mirra
authors.forename: K R
authors.initials: KR
authors.lastname: Sohn
authors.forename: D S
authors.initials: DS
authors.lastname: Shin
mesh_terms: D000328:Adult; D000708:Anaplasia / Q000473:pathology; D001859:Bone Neoplasms / Q000175:diagnosis / Q000473:pathology*; D002804:Chondroblastoma / Q000175:diagnosis / Q000473:pathology*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D012509:Sarcoma / Q000175:diagnosis / Q000473:pathology