label: Lung Cancer cM1a TNM Finding v7
label_lc: lung cancer cm1a tnm finding v7
description: "Lung cancer with separate tumor nodule(s) in a contralateral lobe; tumor with pleural nodules or malignant pleural (or pericardial) effusion.  Most pleural (and pericardial) effusions with lung cancer are due to tumor.  In a few patients, however, multiple cytopathologic examinations of pleural (or pericardial) fluid) are negative for tumor, and the fluid is nonbloody and is not an exudate.  Where these elements and clinical judgment dictate that the effusion is not related to the tumor, the effusion should be excluded as a staging element and the patient should be classified as M0. (from AJCC 7th Ed.)"