title: Commentary.
authors.affiliation: Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN. ryu.jay@mayo.edu.
authors.forename: Jay H
authors.initials: JH
authors.lastname: Ryu
mesh_terms: D004417:Dyspnea / Q000503:physiopathology*; D005122:Exudates and Transudates; D006801:Humans; D008297:Male; D010996:Pleural Effusion / Q000000981:diagnostic imaging*; D011859:Radiography