Source:http://linkedlifedata.com/resource/umls/id/C0504090
UWDA: Serous sac that surrounds the lung and lines the cavity of a hemithorax. Examples: There are only two canonical instances, right and left pleural sacs.,FMA: Serous sac, which has as parts the pleura and the pleural cavity. Examples: There are only two canonical instances, right and left pleural sacs.