Neonatal thrombosis after antenatal treatment of neonatal alloimmune thrombocytopenia with intravenous immunoglobulin

Neonatal alloimmune thrombocytopenia (NAIT) may lead to serious complications, including perinatal intracranial hemorrhage and death. Mothers with a history of previously affected pregnancies should receive antenatal treatment with intravenous immunoglobulin (IVIG), which can be associated with toxicities including thrombosis. An infant born to a mother treated with IVIG and steroids was diagnosed with an inferior vena cava thrombus shortly after birth, was anticoagulated and recovered. Thus, this side effect can be seen, and should be considered, in infants of NAIT-affected pregnancies treated with IVIG.