Isolated pulmonary histiocytosis.

Abstract
Pulmonary disease in the ''histiocytosis syndromes'' is not uncommon. Isolated pulmonary histiocytosis, however, is rarely diagnosed. We describe three patients with this condition, with ages ranging from 3 weeks to 9 1/2 years, in whom there was no evidence of disease in any other organ. Their presentation, treatment, and clinical progress over three years of follow up are discussed.