title: Image of the month: A misleading chest X-ray--not all opacification is effusion.
authors.affiliation: Oxford Centre for Respiratory Medicine Oxford University Hospitals NHS Trust, Oxford, UK ioannis.psallidas@ouh.nhs.uk.
authors.forename: Ioannis
authors.initials: I
authors.lastname: Psallidas
authors.affiliation: Oxford Centre for Respiratory Medicine, Oxford University Hospitals NHS Trust, Oxford, UK.
authors.forename: John P
authors.initials: JP
authors.lastname: Corcoran
authors.affiliation: Oxford Centre for Respiratory Medicine, Oxford University Hospitals NHS Trust, Oxford, UK.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Hallifax
authors.affiliation: Oxford Centre for Respiratory Medicine, Oxford University Hospitals NHS Trust, Oxford, UK.
authors.forename: Najib M
authors.initials: NM
authors.lastname: Rahman
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006548:Hernia, Diaphragmatic / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D010996:Pleural Effusion / Q000000981:diagnostic imaging*; D013902:Radiography, Thoracic