Initial cytogenetic analysis revealed a t(5;12)(q31~33;p13) in 17 of 20 cells (Figure 1(c)) and a presumptive diagnosis of myeloid neoplasm with eosinophilia and translocation t(5;12) suggestive of PDGFRB rearrangement was made. This evidence concerns the gene PDGFRB and Increased total eosinophil count.