title: Pseudolesion of the chest. A conglomerate shadow on the lateral radiograph.
abstract: A pseudolesion encountered in the lateral chest roentgenogram of normal patients is described. This concatenation of shadows can produce an opacity which projects over the distal aortic arch and can simulate a mass or pneumonia. This pseudolesion can be found in 4 to 5 percent of normal lateral chest films and is formed by superimposition of normal upper lobe vascular structures.
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D011014:Pneumonia / Q000000981:diagnostic imaging; D013902:Radiography, Thoracic; D013896:Thoracic Diseases / Q000000981:diagnostic imaging*