Contrast examination as a prognostic factor in the treatment of solitary bone cyst by cortisone injection.

Local injection of radiopaque medium demonstrated the presence of intracystic fibrous septa in 13 patients with solitary bone cyst. Contrast examination was helpful in predicting the response of solitary bone cysts to treatment by injection of methylprednisolone-acetate (MPA). As the number of septa increased, an increased difficulty in obtaining an equal distribution of MPA inside the cyst and a higher incidence of incomplete healing of the cyst was encountered.