title: The first rib as the cause of a "pulmonary nodule" on chest computed tomography.
abstract: A protuberance arising from the first rib may simulate a pulmonary nodule on computed tomography of the chest. The typical location of this density should suggest its true nature, which may be confirmed by a frontal chest radiograph.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D012272:Ribs / Q000000981:diagnostic imaging; D003074:Solitary Pulmonary Nodule / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed