It's not even just false positives. Real positives can also throw up huge dilemmas. For example, let's say it had been discovered during my scans (which were t

It's not even just false positives. Real positives can also throw up huge dilemmas. For example, let's say it had been discovered during my scans (which were taking place for unrelated reasons) that I had a minor aneurysm in my brain that had a roughly annual 0.2% chance of rupture. Let's then say I was given the choice of having an operation with a 10% mortality rate. What do I do? This sort of decision is really tough, because I could easily live another 50 years with such an aneurysm, but the terror of having something like that in your head might scare you into taking a risky operation you logically shouldn't take. Sometimes ignorance of minor problems is a good thing. (Note: These stats above are plucked out of thin air to make a point, but I know of real cases where the numbers have fallen this way.)