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The aetiology, pathogenesis, clinical forms and therapeutic attempts carried out in connection with the central nervous system localizations in acute lymphoblastic leukaemia, on the basis of an extensive review of the literature and of personal experience are examined. The particular role which central nervous system leukaemia plays on the subsequent clinical course of the disease is stressed and the efforts made, both prophylactically and therapeutically, in order to decrease the incidence of this complication, which invariably has a deteriorating influence of the progress of the disease are described.

A morphological, cytochemical, genetic and autoradiographic examination of the myeloblasts observed in the terminal phase of a patient with Hodgkin's disease is reported. Comparison is made with the literature data in an assessment of the possible aetiopathogenesis of this association, which has become increasingly frequent in recent years in coincidence with the more widespread employment of more radical radio- and polychemotherapeutical management.