[Histiocytosis X with mandibular involvement. Apropos of a case]

This is a case report of mandibular Histiocytosis X in its Eosinophilic Granuloma's form. A review of literature is realized in the two clinical forms of Histiocytosis X: localised forms, with insistance in the Eosinophilic Granuloma of jaws, and diffused forms represented by the Letterer-Siwe disease and the Hand-Schüller-Christian disease.