A recent WDAY story about thermograms of the breast needs some additional information and clarification to help people make informed decisions. Thermograms are not a replacement for mammograms. Thermograms detect surface temperature changes; mammograms use X-rays to look deep into breast tissue. A biopsy, evaluated by a pathologist, is then necessary to confirm a breast cancer. No screening test is perfect. Compared to mammograms, thermograms have a higher false negative rate (miss more breast cancers) and a higher false positive rate (sees things that prove to not be cancers).