Transient abnormal myelopoiesis is a transient myeloproliferative disorder seen in ∼15% to 20% of infants with Down syndrome. These infants are usually asymptomatic, requiring only monitoring, but they can have variable severity of symptoms up to multisystemic dysfunction requiring chemotherapy. GATA-1 somatic mutations acquired in utero are pathognomic of this entity and present nearly in all cases. Herein, we present a case of Down syndrome in a neonate who presented within her first week of life with life-threatening features of transient abnormal myelopoiesis requiring chemotherapy support. In addition, next-generation sequencing revealed a small mutant clone (8%) positive for a novel frameshift GATA-1 mutation.
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