title: Retrocardiac phantom image on hypocycloidal chest tomograms.
abstract: A phantom image produced by displaced blur margins of the cardiac silhouette and mimicking a paraspinous retrocardiac mass was noted in 50% of 125 hypocycloidal full chest tomograms. It was reproduced on tomograms of a chest phantom. Careful comparison with routine posteroanterior and lateral chest radiographs prevents misinterpretation.
mesh_terms: D005189:False Positive Reactions; D006801:Humans; D013902:Radiography, Thoracic; D013896:Thoracic Diseases / Q000000981:diagnostic imaging; D014056:Tomography, X-Ray