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Malignant transformation of aneurysmal bone cysts: a case report.

Both malignant fibrous histiocytoma and osteosarcoma have been reported in the malignant transformation cases. We describe a male patient with a late malignant fibrous histiocytoma at the site of a primary aneurysmal bone cyst that has been treated with curettage and bone grafting three times since 1985. The patient received implantation of reconstructive prosthesis along with the third operation for wide excision of the recurrent lesion. He has been informed the publication of the data concerning the diagnosis and treatment of the cyst.