Results of treatment of 7 cases of aneurysmal bone cysts and 12 cases of solitary bone cysts in 19 patients treated in our Department between 1991 and 1996 are presented. Changes were found in the humerus, femur, tibia and fibula. Curettage or excision was the mode of treatment. Recurrence of the condition has been noted in 4 cases. Excision of the change and filling of the defect with autologous or homologous bone graft is more efficient than curettage alone.