[Disseminated histiocytosis X]

Three cases of 4-year-, 16-month- and 8-month-old children suffering from a disseminated form of histiocytosis X showed overlapping of Hand-Schüller-Christian syndrome and Letterer-Siwe syndrome in clinical picture, biopsy and autopsy. Morphological lesion does not develop simultaneously in all the organs. Some of them tend to steatosis and fibrosis of histiocytosis infiltrations, which the others do not.