title: The ring-around-the-artery sign.
authors.affiliation: Department of Diagnostic Imaging, the Ottawa Hospital, Civic Campus, 1053 Carling Ave, Ottawa, ON, Canada K1Y 4E9. prachipragya@yahoo.com
authors.forename: Prachi P
authors.initials: PP
authors.lastname: Agarwal
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D008478:Mediastinal Emphysema / Q000000981:diagnostic imaging*; D011651:Pulmonary Artery; D013902:Radiography, Thoracic