Transient Leukoerythroblastic Reaction in a Newborn with Rh-Incompatibility and Hemolysis: Case Report and Literature Review.

Leukoerythroblastosis is rarely encountered in clinical practice and is characterized by the presence of leukocytosis and erythroid and myeloid blast cells in peripheral blood. The most common causes of leukoerythroblastosis in early childhood are viral infection, juvenile myelomonocytic leukemia, and osteopetrosis. To the best of our knowledge, leukoerythroblastic reactions associated with hemolysis have not been previously reported in newborns. Here, we report a 24-hour-old female term newborn diagnosed with a leukoerythroblastic reaction, severe anemia, and neonatal hyperbilirubinemia secondary to Rh incompatibility based on presentation, laboratory determination, and peripheral morphology. A high index of clinical suspicion is required to avoid life-threatening complications among health professionals in the neonatal care unit.