The myeloproliferative disorders. An historical appraisal and personal experiences

Leukemia & Lymphoma
J J Michiels

Abstract

According to strict morphological, biochemical and cytogenetic criteria Philadelphia chromosome positive essential thrombocythemia and chronic granulocytic leukemia constitute a separate malignant and individual disease entity, whereas Philadelphia chromosome negative essential thrombocythemia, polycythemia vera and agnogenic or megakaryocytic myeloid metaplasia form a chronic proliferation of three hematopoietic cell lines. Histopathology from bone marrow biopsies permits the characterization and diagnostic differention of the various myeloproliferative disorders and appears to be a main and specific diagostic criterion for polycythemia vera and essential thrombocythemia. Hemorrhagic thrombocythemia is a clinical syndrome of recurrent spontaneous mucocutaneous and secondary hemorrhages often preceded by thromboses, extremely high platelet counts, pseudohyperkalemia, increased bone marrow cellularity and frequently splenomegaly. The diagnostic criteria of essential thrombocythemia with paradoxical occurrence of thrombotic events and hemorrhagic manifestations are a platelet count in excess of 1000 x 10(9)/L and increased bone marrow cellularity in the majority of the cases. Erythromelalgia and other microcirculatory ischemic or...Continue Reading

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