title: Reversed halo sign.
authors.affiliation: Universidade Federal Fluminense, Niterói, RJ, Brasil.
authors.forename: Edson
authors.initials: E
authors.lastname: Marchiori
authors.affiliation: Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil.
authors.forename: Gláucia
authors.initials: G
authors.lastname: Zanetti
authors.affiliation: Santa Casa de Misericórdia de Porto Alegre, Porto Alegre, RS, Brasil.
authors.forename: Bruno
authors.initials: B
authors.lastname: Hochhegger
mesh_terms: D000328:Adult; D018549:Cryptogenic Organizing Pneumonia / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008297:Male; D054060:Pulmonary Infarction / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed