Pulmonary pseudonodule.
A nodular density seen at the posterior lung base on lateral chest radiographs proved to be normal bone in the spine. This nodule results from slight thickening of the bone at the superior aspect of the area where the two laminae join to form the spinous process.
D003937:Diagnosis, Differential; D006801:Humans; D011859:Radiography; D003074:Solitary Pulmonary Nodule / Q000000981:diagnostic imaging*; D013131:Spine / Q000000981:diagnostic imaging*