RT Journal Article SR Electronic T1 Benign Pleural Lesions Simulating Tumour JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 39 OP 44 DO 10.1136/thx.18.1.39 VO 18 IS 1 A1 Tivenius, L. YR 1963 UL http://thorax.bmj.com/content/18/1/39.abstract AB