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Liver fibrosis with hypereosinophilia causing transient abnormal myelopoiesis. Transient abnormal myelopoesis is mostly self-resolving and has a good prognosis, but some patients subsequently die of liver fibrosis. We report the case of an infant with Down syndrome who developed life-threatening liver fibrosis at the same time as the blasts were about to disappear. This patient also had a marked increase in eosinophils, which were possibly harboring a GATA1 mutation and were expressing a high level of platelet-derived growth factor-B mRNA; these may have been involved in the development of liver fibrosis. Low-dose cytosine arabinoside therapy effectively treated both hypereosinophilia and liver fibrosis.