title: Something old? Something new? Second primary or pulmonary metastasis in the patient with known extrathoracic carcinoma.
authors.forename: F B
authors.initials: FB
authors.lastname: Askin
mesh_terms: D014408:Biomarkers, Tumor; D003937:Diagnosis, Differential; D006801:Humans; D008175:Lung Neoplasms / Q000175:diagnosis* / Q000556:secondary*; D016609:Neoplasms, Second Primary / Q000175:diagnosis*
chemical_list: D014408:Biomarkers, Tumor