RT Journal Article SR Electronic T1 An early lesion of pulmonary carcinosarcoma: possible diagnostic problem in frozen section interpretation JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 638 OP 638 DO 10.1136/jcp.56.8.638 VO 56 IS 8 A1 H Hattori YR 2003 UL http://jcp.bmj.com/content/56/8/638.1.abstract AB