title: "Reversed halo sign".
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Walker
authors.forename: Tan-Lucien
authors.initials: TL
authors.lastname: Mohammed
authors.forename: Jonathan H
authors.initials: JH
authors.lastname: Chung
mesh_terms: D018549:Cryptogenic Organizing Pneumonia / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D018410:Pneumonia, Bacterial / Q000175:diagnosis; D014057:Tomography, X-Ray Computed