A case of chronic neutrophilic leukemia (CNL), associated with polycythemia later, was presented. Patient, a 75-year-old Japanese woman, was admitted because of the generalized lymphadenopathy, hepatosplenomegaly (one and three fingerbreadths below the respective costal margin) and leucocytosis (26,000/μ
l) in October, 1974. On admission, the laboratory study revealed a slight anemia and WBC count of 19,400/μ
l (1.0% myelocyte, 1.0% metamyelocyte, 25.5% band-formed, 63.0% segmented neutrophil, 1.0% monocyte and 8.5% lymphocyte). LAP score was within the normal range, and no Ph
1 chromosome was observed on chromosomal analysis. Bone marrow finding was a hypercellularity with the myeloid cells showing various stages of maturation. There was neither eosinophilia nor basophilia. Thereafter, neutrophils gradually increased and reached 100,000/μ
l. Furthermore, polycythemia (RBC mass of 38.5 m
l/kg) without an elevation of erythropoietin was first detected to coexist in October, 1975. Thus, the treatment with pipobroman was instituted. However, a rapid increase reaching 178,560/μ
l in neutrophils occurred in April, 1978, and she died three days later. Postmortem examination revealed an infiltration of mature neutrophils in the splenic sinusoids and red pulp, where necrotic foci were observed. Contrary to these findings, such bone marrows as vertebral, sternal and femoral were replaced by immature myeloid cells, but mature neutrophils were partly observed in these bone marrows. Therefore, it is suggested from these findings that the case here presented might be a type of CNL terminating in blastic crisis.
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