Many things go into this kind of decision. How old are you? Are you symptomatic? If there was no biopsy, how do they know it's a NET? My surgeon also told me to wait and watch, but i went ahead with a FNAC and it came back expressing chromogranin. Then dota confirmed it and showed no obvious spread, just the one tumor. I did another MRI in February. The tumor had remained static. I opted to have it out anyway. If the tumor is not changing and you have no symptoms and your doctor thinks it's just a serous cyst, then wait and watch. But if you aren't sure of what it is, why are the docs taking a chance? These are just thoughts. There's a tremendous amount of controversy about wait and watch. I'd like to know your doctor's rationale for waiting, but I'd also follow his advice. I'm 65 and didn't want to chance having to have this same surgery, which is major, when i was older and more frail.