Breast cancer is often first suspected when a lump is felt or when an abnormal area is found on a mammogram. Most of the time, these suspicious areas do not turn out to be cancer. But the only way to know for sure is through follow-up tests. Understanding these tests and how to interpret their results can help you take control of your situation and pick the course of action that is best for you.

This section of Understanding Breast Cancer discusses tests called biopsies, which involve the removal of cells or tissue (from the breast). Tests that help determine the most appropriate treatment if cancer is found are also covered.

For information on screening tests like mammography and clinical breast exam, see the Early Detection and Screening section.