dt_toronto_geek
Superstar
Depends on the location of the tumours. If they're big enough, they show up pretty clearly. They look at the scans the same day so they might have had bad news today. Even if he was scanned a few months ago and they thought it was just a small benign tumour, they might have got a surprise today. You never know what's around the corner as you age. He definitely ticks a lot of the boxes for colon cancer risk, I wouldn't be surprised if they found something today.
As I understand it, a CT can still miss things - it's by no means perfect, but it's the best visual diagnoses available to Doctors, probably even better than opening him up and doing a visual inspection of an area after removing something like a cyst on an organ. The only thing better is an autopsy, downside: you have to be dead. Remember, they already have blood panels, and they can often tell a story too.