[Histiocytosis X. 3 different cases: eosinophilic granuloma, Hand-Schueller-Christian disease, Abt-Letterer-Siwe disease].

The authors present three different cases of histiocytosis X: the eosinophilic granuloma, the Hand-Schuller-Christian syndrome and the Letterer-Siwe syndrome. As it appears in the main articles concerning this argument, the Aa. emphasize the common features belonging to the three different forms of histiocytosis: the involvement of the bones and of other tissues. Moreover the prognosis is defined as good in the first case, uncertain in the second case and severe in the third.