Endoscopic sinus surgery

/ˌɛndəʊskˈɒpɪk sˈaɪnəs sˈɜːdʒəɹi/

/ˌɛndoʊskˈɑːpɪk sˈaɪnəs sˈɜːdʒɚɹi/

a minimally invasive procedure that uses an endoscope to treat sinus-related conditions by removing obstructions or enlarging sinus passages