Myelodysplasia and Mast Cell Leukemia with t(9;22)

Figure 6

Metaphase with FISH for ASS1 (spectrum aqua)/ABL1 (spectrum orange)/BCR (spectrum green). The arrows point to the 2 fusion signals on der(9) and der(22). The other fusion signal on normal chromosome 9 is the result of juxtaposition of ASS1 (spectrum aqua) with ABL1 (spectrum orange) and does not represent the typical fusion seen with BCR/ABL1.