[Chronic myeloid leukemia developing into a multifocal extramedullary blast crisis].

A 47-old male with accelerated-phase chronic myelogenous leukaemia is presented. In spite of a good response to hydroxyurea and interferon treatment, the patient developed multiple foci of granulocytic sarcoma as a special form of blastic crisis. A review was carried out of the different aspects of this entity, stress being laid on the diagnostic characteristics and the current therapeutic approach in such cases.