title: Spindle cell sarcoma of bone arising from a non-ossifying fibroma: A case report.
authors.affiliation: IV Orthopaedic Clinic, Rizzoli Orthopaedic Institute, via G. C. Pupilli 1, 40136 Bologna, Italy.
authors.forename: Alessio
authors.initials: A
authors.lastname: Biazzo
authors.affiliation: Orthopaedic Clinic Villa Santa Teresa, Bagheria, Italy.
authors.forename: Costantino
authors.initials: C
authors.lastname: Errani
authors.affiliation: Pathology Department, Rizzoli Orthopaedic Institute, via di Barbiano 10/1, 40136 Bologna, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Gambarotti
authors.affiliation: IV Orthopaedic Clinic, Rizzoli Orthopaedic Institute, via G. C. Pupilli 1, 40136 Bologna, Italy.
authors.forename: Massimiliano
authors.initials: M
authors.lastname: De Paolis
authors.affiliation: IV Orthopaedic Clinic, Rizzoli Orthopaedic Institute, via G. C. Pupilli 1, 40136 Bologna, Italy.
authors.forename: Davide Maria
authors.initials: DM
authors.lastname: Donati
authors.affiliation: IV Orthopaedic Clinic, Rizzoli Orthopaedic Institute, via G. C. Pupilli 1, 40136 Bologna, Italy ; II Orthopaedic Clinic, Rizzoli Orthopaedic Institute, via G.C. Pupilli 1, 40136 Bologna, Italy.
authors.forename: Sandro
authors.initials: S
authors.lastname: Giannini
keywords: Malignant transformation; Non-ossifying fibroma; Secondary osteosarcoma; Spindle cell sarcoma