Unusual presentation of monostatic fibrous dysplasia in zygoma.

Fibrous dysplasia is a nonneoplastic, developmental disease of the bone that begins in childhood with obscure etiology. Clinically, it is presented as a continuously growing, painless mass at late childhood. Maxilla and mandible are mostly involved in facial skeleton. Involvement of the zygomatic bone is rare. Fibrous dysplasia of the zygomatic bone may cause orbital dystopia, diplopia, proptosis, loss of visual acuity, swelling, mass formation, or facial asymmetry. We present 1 case of fibrous dysplasia with isolated zygomatic bone involvement.