A myelodysplastic/myeloproliferative neoplasm characterized by the presence of leukocytosis with increased numbers of neutrophils, promyelocytes, myelocytes, and metamyelocytes; blasts less than 20% in bone marrow and peripheral blood; dysgranulopoiesis; minimal or absent monocytosis; absence of eosinophilia; and presence of bone marrow hypercellularity with granulocytic proliferation and granulocytic dysplasia. dysplasia in the erythroid and megakaryocytic lineages may be present or absent. no evidence of bcr/abl fusion is present.