title: Radiology-pathology conference: osteosarcoma in a cartilaginous exostosis of the femur.
abstract: Osteochondromas are common lesions in the metaphyseal segments of the long bones and are known to be able to degenerate into chondrosarcoma. We present the case of a 20-year-old patient with an osteosarcoma at the base of a cartilaginous exostosis and discuss the causal relationship between the two lesions on the basis of the radiologic and pathologic findings.
authors.affiliation: Department of General Orthopaedics, Westfalian Wilhelms University of Munster, University Hospital, Albert Schweitzer Street 33, 48149 Munster, Northrhine-Westfalia, Germany. sa.meissner@email.de
authors.forename: Stefan A
authors.initials: SA
authors.lastname: Meissner
authors.forename: Volker
authors.initials: V
authors.lastname: Vieth
authors.forename: Christian
authors.initials: C
authors.lastname: August
authors.forename: Winfried
authors.initials: W
authors.lastname: Winkelmann
mesh_terms: D000328:Adult; D001706:Biopsy / Q000379:methods; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000628:therapy; D003937:Diagnosis, Differential; D005269:Femur / Q000000981:diagnostic imaging* / Q000473:pathology; D006801:Humans; D007717:Knee / Q000000981:diagnostic imaging / Q000473:pathology; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D016609:Neoplasms, Second Primary / Q000175:diagnosis* / Q000628:therapy; D015831:Osteochondroma / Q000175:diagnosis* / Q000628:therapy; D012516:Osteosarcoma / Q000175:diagnosis* / Q000628:therapy; D010146:Pain / Q000209:etiology; D011859:Radiography