Musculoskeletal ImagingOssifying fibroma
a giant cell fibro-osseous
lesion that is closely related both radiographically and pathologically to
fibrous dysplasia. The most common sites of involvement are the facial bones and tibia or fibula, although rarely other
tubular bones may be affected.
Tumours of the facial bones are expansile, slowly growing, well circumscribed lesions in the tooth-bearing portion of the mandible or maxilla (Fig.1). Some children may develop juvenile aggressive ossifying fibroma with calcification in the osteolytic areas.
Ossifying fibromas of the tubular bones have also been termed osteofibrous dysplasia. Localization to the diaphysis is typical. The tibia may reveal slight or moderate anterior or anterolateral bowing with pathologic fractures. A ground glass appearance may also be evident. Radiographically ossifying fibromas in the tubular bones resemble the lesions of fibrous dysplasia or adamantinoma (Fig.2).
DR/RB
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Oblique radiograph of the mandible demonstrates a large expansile osteolytic lesion in the mandible.
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Ossifying fibroma, Fig.1 | | Ossifying fibroma, Fig.2 | |