An unusual case of "simple bone cyst" of the mandible.

Reviews of the literature show that simple bone cysts of the jaws no longer can be considered rare. The clinical and radiographic appearances are mostly rather typical, but in some cases there are great variations. In this article an unusual case with both facial asymmetry and bilateral occurrence is described. The differential diagnosis between simple bone cysts, tumors, odontogenic cysts and vascular abnormalities is sometimes hard to establish. In those cases aspiration biopsy can be of great help.