Xanthoma disseminatum avec atteinte viscérale multifocale asymptomatique

This case involves a very rare form of xanthoma disseminatum. The localized facial skin lesions revealed multifocal non-Langerhans histiocytosis that was in fact asymptomatic. The diagnosis of XD was based on clinical, histological and immunohistochemical criteria. Xanthoma disseminatum is a non-Langerhans histiocytic proliferation first described by Montgomery in 1938. This rare entity is characterized by skin and mucous membrane xanthomatosis in which the facial involvement is common, together with diabetes insipidus and normal lipid metabolism. The prognosis is determined by the presence of mucosal xanthomas and visceral involvement. Thus, all xanthogranulomas involving multiple lesions warrant screening for visceral involvement. Diagnosis of this entity can be difficult and is usually based on clinical and histopathological findings. In addition, treatment is complex and non-consensual.