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A case report of synchronous osteoblastoma and fibromatosis

¹ Department of Radiology, Vancouver General Hospital, University of British Columbia, ² Department of Radiology, British Columbia Cancer Agency, ³ Department of Pathology, Surrey Memorial Hospital, Vancouver, British Columbia, Canada

Correspondence: Professor Peter L Munk, MSK Division Head, Department of Radiology, Vancouver General Hospital, 855 West 12th Avenue, Vancouver, BC, Canada V5Z 1M9. E-mail: peter.munk{at}vch.ca

Osteoblastoma is a rare bone tumour that accounts for 1% of all primary bone tumours and 3% of all benign bone tumours. Osteoblastoma occurring in long bones has a predilection for the meta-diaphysis. It bears a close histological resemblance to osteoid osteoma, but it is not growth limited — usually 2 cm or greater at diagnosis. The term "fibromatosis" covers a broad spectrum of benign fibrous tissue proliferations. It is characterized by infiltrative growth and a tendency for recurrence; however, unlike sarcoma, it never metastasizes. To our knowledge, this is the first case report in the English literature of a patient with synchronous presentation of an osteoblastoma and fibromatosis.