Considerations in the corticosteroid treatment of bone cysts.

To be effective in treating bone cysts, intracavital injections of corticosteroids must be able to run freely over their lining membrane. Free movement may be prevented by complete or partial osseous or fibrous septa or by the cyst contents. This report illustrates such situations. To solve the problem, the interior anatomy of the cyst should be evaluated by a contrast study and then, when necessary, several corticosteroid injections should be made in different cyst compartments. The volume of corticosteroid should be modified according to the size of the cyst.