Why would surgeon a say coin lesion and surgeon b say carciniod, when doctors on this sight say they are different?

Boys & Boy Scouts: Remember, "all boy scouts are boys, but not all boys are boy scouts". A coin lesion means the spot on the xray looks very round, so a variety of different things can be coin lesions. Looking at it that way, all round-looking carcinoid tumors on xrays are coin lesions, but not all coin lesions are carcinoids. Carcinoids can also be small or overlap with other organs, and not look like coin lesions.

See below: A carcinoid can present as a coin lesson, but so can many other things.