title: The enigma of the solitary pulmonary nodule.
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000145:classification / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011859:Radiography; D014481:United States