RESUMEN
Bone fibrous dysplasia is a benign and unfrequent disease, it represents 7% of benign bone-tumours. It is characterized by the proliferation of the fibrous tissue, when it affects only one bone, it is called "monostotic form" and when it affects several bones it is called "polyostotic form". This disease mainly affects young persons, with equal repartition between sexes. Most authors agree nowadays that it is of congenital origin. The clinical symptomatology relies on the localization of the dysplasic lesions: in long bones we observe pain mostly, bone deformities and pathologic fractures. Radiology is an essential examination for enhancing the diagnosis. However, the dysplasic disease often creates problems of differential diagnosis, which necessitate a histologic examination. The treatment may be medical, orthopedic or surgical and it is reserved only for bones lesions which generate a functional handicap. Through the overall clinical observation, authors report a case of fibrous dysplasia with particular localization on both parts of the elbow