[Simultaneous discovery of a malignant histiocytosis in a newborn and a preleukemic syndrome in his mother (author's transl)].

A malignant histiocytosis in a newborn was found at the same time than a preleukemic syndrome in his mother (less than 10% myeloblasts with Auer rods). An overt myeloblastic leukemia occurs in the mother in the next four months. This uncommon association was presented and discussed.