Wiktionary
thoracoscopy
n. (context medicine English) A procedure for examining the inside of the chest cavity through a small incision, using an endoscope.
Wikipedia
Thoracoscopy
Thoracoscopy is a medical procedure involving internal examination, biopsy, and/or resection of disease or masses within the pleural cavity and thoracic cavity. Thoracoscopy may be performed either under general anaesthesia or under sedation with local anaesthetic.