We report the case of a term male infant with severe persistent pulmonary hypertension
of the newborn, who developed massive neutrophilia of unknown etiology. An extensive
evaluation failed to disclose an obvious cause for his neutrophilia. A bone marrow
aspirate was performed and was consistent with a leukemoid reaction. This paper reviews
the neonatal leukemoid reaction and its significance.
Newborn - leukemoid reaction - persistent pulmonary hypertension - neutrophilia