[The myelogenous nature of the so-called juvenile "acute paraleukoblastic leukosis"]

Following a critical review of todays predominating opinion on the morphological definition of leukosis cells in severe paraleukoblastic leukosis three cases of the so-called aleukemic from of severe leukosis are described. Such rare cases, in which -- as it is known -- the peripheral blood remains normal while bone marrow shows a paraleukoblastic metaplasia seem to be good evidence for the myelogenic nature of the cells during severe paraleukoblastic leukosis.