Pleural effusions in an overlap syndrome of idiopathic hypereosinophilic syndrome and erythema elevatum diutinum.

We report a patient with idiopathic hypereosinophilic syndrome presenting with bilateral eosinophilic pleural effusions. He also had erythema elevatum diutinum, a rare skin disease of the vasculitic type. No cardiomyopathy was present. Pleural effusions, skin lesions, and blood eosinophilia disappeared with prolonged corticosteroid treatment.