What would be the medical part of ENT? The "medical stuff" that an ENT does frequently?
ENT is unique in the world of surgery as we do not have a defined medical counterpart.
For example, CV surgery has the Cardiologist, Urology has the Nephrologist, General Surgery has the internist, Orthopedics has the FP sports medicine guys, etc. ENT has no real counterpart. (Derm is probably the only thing that comes close--but most of them aren't true surgeons--able to get priveleges in the OR).
Therefore, we do quite a bit of medical management. What do we manage medically? Well, I think a good ENT is someone who tries to manage anything that can be managed medically with medicine before resorting to surgery. In other words, treat sinusitis with appropriate maximal medical therapy before jumping in to do a FESS. Don't do a shunt for dizziness until you've tried other conservative measures for Meniere's.
I think that the numbers show that if you took every patient referred to you as an ENT, about 15-20% go to surgery. That is a very bland number, though. An academic subspecialist is going to have a much higher rate. A peds ENT is going to be higher. But for your average joe community general ENT, that number is discussed by our Academy very frequently. (Having said that, I'm the joe community general guy and I think my number is more around 25%. I don't think I'm aggressive about going to the OR, rather I think it's just more my referral pattern. My PCP's are real good at not sending stuff until they think it really needs surgical intervention).
Thus, overall most of our patients are treated medically.