James Tysome was the invited guest lecturer at Endoscopic sinus, Eustachian tube and ear course the Massachusetts Eye and Ear Hospital in Boston, Massachusetts, USA from 7-9 May 2018. 92 delegates from 19 countries attended the course with Mr Tysome presenting his research around redefining Eustachian tube dysfunction and how to measure it. He also taught delegates how to perform balloon dilatation of the Eustachian tube in laboratory sessions.