title: Cytologically proved malignant pleural effusions.
authors.forename: D J
authors.initials: DJ
authors.lastname: Castro
authors.forename: G D
authors.initials: GD
authors.lastname: Nuevo
authors.forename: E
authors.initials: E
authors.lastname: Perez-Rodriguez
mesh_terms: D000368:Aged; D005122:Exudates and Transudates / Q000166:cytology*; D005260:Female; D006801:Humans; D008297:Male; D016066:Pleural Effusion, Malignant / Q000473:pathology*; D011446:Prospective Studies