title: [Histiocytosis X: a controversial term].
abstract: In reference to Histiocytosis X as a controversial term, and analysis is submitted to underline lack of linkage between clinico-histological aspects in the Letterer-Siwe (LS) and Hand Schüller Christian (HSC) alterations. As pointed out, the HSC denomination tends to disappear, while debate becomes more difficult around the LS phenomena. A definition is offered to delimit more precisely the two clinical entities in question.
authors.forename: J W
authors.initials: JW
authors.lastname: Ovalle Castro
mesh_terms: D006646:Histiocytosis, Langerhans-Cell / Q000145:classification*; D006801:Humans; D008206:Lymphatic Diseases / Q000145:classification*
vernacular_title: Histiocitosis X: término de controversia.