This young patient has multiple lesions involving the maxilla and mandible (Figs. 1-5), all except one showing bone formation and expansion. The mandibular condylar lesion (Fig. 4) shows an osteolytic lesion, which is also known in patients with fibrous dyplasia.
Polyostotic fibrous dysplasia often occur only in the cranio-facial skeleton and may not involve the rest of the skeleton. It may be associated with other metabolic abnormalities, unlike monostotic fibrous dysplasia.