We're not knocking doctors. They do their best, and such incidents are (we hope) rare. But still, these kinds of stories are scary.
Coincidentally, shortly before the mastectomy story broke, CNN ran an article titled "5 commonly misdiagnosed diseases." The article's first suggestion: Ask for more tests. We tend to assume that labs can't get it wrong, but there is a woman in Florida who would beg to differ. She has now filed a lawsuit, and frankly we hope she gets big bucks. We all make mistakes, but we should accept the consequences when we do.