TY - CHAP M1 - Book, Section TI - Transient Myeloproliferative Disorder A1 - Balagtas, Jay Michael S. A1 - Lacayo, Norman A2 - Stevenson, David K. A2 - Cohen, Ronald S. A2 - Sunshine, Philip PY - 2015 T2 - Neonatology: Clinical Practice and Procedures AB - Transient myeloproliferative disorder (TMD) is a unique clonal proliferation of megakaryocytic precursors that is clinically indistinguishable from congenital leukemia and is seen almost exclusively in neonates with trisomy 21 (Down syndrome).1 TMD is typically characterized by the presence of leukocytosis and circulating blast cells in the blood of an otherwise healthy-appearing newborn. These blast cells will generally resolve spontaneously by 3–6 months of age without any specific interventions.2 However, approximately 20% of patients will present with severe hydrops, organomegaly, hepatic fibrosis, and other life-threatening complications, with an associated mortality rate approaching 45% at 3 years.3 SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/19 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1109798755 ER -