Pulmonary eosinophilic vasculitis in a neonate with congenital chylothorax.

We report a case of congenital bilateral chylothorax, complicated by pulmonary eosinophilic vasculitis and transient eosinophilia. Excluding all known forms of eosinophilic pulmonary disease either histologically or clinically, possible mechanisms of its etiology are discussed. Treatment with corticosteroids was successful, and after a prolonged clinical course the patient recovered by age 2 years.