When I was in school, the hospital was getting a new MRI machine and they asked for volunteers to get different things scanned as they were calibrating protocols or something and needed to make sure everything was good. I thought it would be cool, and I volunteered. Free MRI, right?
Can't recall which protocol they did, but ended up getting my face done. Essentially anterior half of my head. When I got out, the tech was like "hang on a minute, we're just going to get the radiologist to come talk to you." They found a lesion in my parotid gland. He went through a couple things it could be and said it's probably nothing to worry about, but I could go see ENT to do a biopsy.
I was a very busy student at the time, and didn't really have time to go to appointments and get biopsies and stuff. And I just did a bunch of research into the possibilities and ultimately decided it's probably benign, and I can just watch it closely. It has been about 11 years and, knock on wood, I'm still ok.
It could very well be cancer slowly spreading through my body (doubt it), but that's just my personal example. What if it was on my liver, or a benign pancreatic cyst, or brain. Would I have been able to convince myself to ignore it? Would I have ended up getting poked, prodded, and gone through a ton of stress just to find out it was nothing? In the ER, lots of patients come in for abdominal pain, or a cough, or something, get scanned, and find something strange that requires workup. I remember one poor young lady, around 30, sent to the ER from urgent care because it looked like she had cancer all over her lungs. Can't remember what the pulmonologists ended up finding, but benign.
As a nerd, I'd love to take a peak inside my body. But I also kinda don't want to know some things either.