A chronic myelogenous leukemia-like myeloproliferative disorder accompanied by T-cell lymphoblastic lymphoma with chromosome translocation t(8;13)(p11;q12): a Japanese case.

A 40-year-old male patient presented with leukocytosis and mild splenomegaly. Bone marrow aspirate showed myeloid hyperplasia and eosinophilia resembling chronic myelogenous leukemia in the chronic phase. Cytogenetic examination of bone marrow cells revealed an unusual karyotype, t(8;13)(p11;q12), in 20/20 metaphases. Not the BCR/ABL, but the ZNF198/FGFR1 chimeric mRNA was detected by reverse transcription-polymerase chain reaction. Since 1992, 12 patients with a similar atypical myeloproliferative disorder with T-cell non-Hodgkin's lymphoma or eosinophilia, associated with a t(8;13) translocation in both bone marrow and lymph node specimens, have been described. The present case is an additional one that should be classified into this new clinicopathologic entity.