CERTAIN bone dysplasias of the mandible and maxilla frequently present a unique challenge in diagnosis and treatment because of their pathogenetic dissimilarity yet microscopic similarity to lesions in other bones. Numerous such lesions of the jaws have been described in the literature under a variety of terms, although the present trend is toward classifying many of these under one category: fibrous dysplasia.
While the central giant-cell tumor of the jaw still probably represents a distinct entity, it has been pointed out by Waldron1 and many others that, in the light of present knowledge, some lesions previously diagnosed as such would today be called fibrous dysplasia. To eliminate the connotation of the term "tumor" and to describe better the true nature of the lesion, Jaffe2 has suggested the term "giant cell reparative granuloma" for certain of these conditions. It is not the purpose here to attempt to review the