part of part of surrounded by surrounded by thoracic cavity anatomical cavity mediastinum http://upload.wikimedia.org/wikipedia/commons/a/ab/Mediastinum.png mediastinal EFO:0003057 UMLS:C0025066 GAID:94 MESH:D008482 The central part of the thoracic cavity enclosed by the left and right pleurae. CALOHA:TS-2338 SCTID:181217005 EMAPA:36001 FMA:9826 MA:0003075 NCIT:C12748 Wikipedia:Mediastinum mediastinal part of chest UBERON:0003728 mediastinal pleura