The rate of false-positives is almost always non-zero. So having an MRI scan may show a problem that doesn't actually exist. I think I remember seeing somethin

The rate of false-positives is almost always non-zero. So having an MRI scan may show a problem that doesn't actually exist. I think I remember seeing something about not doing mammogram and/or prostate screenings too often, lest they find a false-positive and do a whole bunch of followup tests and procedures that in turn keep widening the risk for complications.