What's your greatest medical surprise?

I was having an ultrasound to check for gall bladder issues a while back and asked the tech if she saw any ‘sludge’ (I view ultrasounds of animals all the time at work) and she rather primly told me that she couldn’t discuss results, the radiologist would send me a report. She moved the wand around for a while, and then asked “Has anyone ever told you that you don’t have a left kidney?”. (A follow-up CT confirmed that I have renal aegensis, and was born with just one kidney.)

The irony of her not being willing to discuss my gall bladder while at the same time dropping a bomb like that has never left me.

Have you ever gotten gotten weird news?