Source:http://linkedlifedata.com/resource/umls/id/C0504089
UWDA: Organ with organ cavity, constituted of a serous membrane, which surrounds a serous cavity. Examples: pleural sac, pericardial sac, tendon sheath, bursa.,FMA: Organ with organ cavity, which has as parts a serous membrane and a serous cavity . Examples: pleural sac, pericardial sac, tendon sheath, bursa.