title: Early pleural effusion in histiocytosis X.
abstract: Two cases of histiocytosis X, one of the disseminated form and the other localized to the lung, are reported, in which pleural effusion, probably due to pleural involvement as assessed by biopsy, was one of the initial manifestations of the disease.
mesh_terms: D003937:Diagnosis, Differential; D005260:Female; D006646:Histiocytosis, Langerhans-Cell / Q000150:complications* / Q000175:diagnosis / Q000473:pathology; D006801:Humans; D008875:Middle Aged; D010996:Pleural Effusion / Q000166:cytology / Q000175:diagnosis / Q000209:etiology*