[Reticulohistiocytosis of benign evolution (Hashimoto-Pritzker type). Electron microscopy study]

We describe a rare form of histiocytosis, characterized by numerous tumoral lesions of the skin appearing at birth and desappearing spontaneously within 2 month without visceral lesions and without systemic symptoms. Light microscopy shows histiocytes, some of which contain an irregular nucleus with a spumous cytoplasm surrounded by many red blood cells. Electron microscopy shows myelinoid inclusions in the histiocyte cytoplasm and "vermiform" bodies. In our opinion, a similar anatomoclinical entity was described for the first time and only once by Hashimoto and Pritzker.