[Histiocytosis X: problems of differential diagnosis in otorhinolaryngology].

Four cases of Histiocytosis X are presented here, with symptoms otorhinolaryngologic. The evolution has been good, so they have been without disease for three of four years. We are presenting the problem of differential diagnosis of this disease for ENT specialists and the delay in the diagnosis. All our cases were diagnosed after one year of the beginning of symptoms.