mediastinoscopy

noun
me·​di·​as·​ti·​nos·​co·​py | \ ˌmē-dē-ˌas-tə-ˈnäs-kə-pē How to pronounce mediastinoscopy (audio) \
plural mediastinoscopies

Medical Definition of mediastinoscopy

: examination of the mediastinum through an incision above the sternum