An osteolytic lesion (from the Greek words for "bone" (ὀστέον), and "to unbind" (λύειν)) is a softened section of a patient's bone formed as a symptom of specific diseases, including breast cancer and multiple myeloma. This softened area appears as a hole on X-ray scans due to decreased bone density, although many other diseases are associated with this symptom.[1] Osteolytic lesions can cause pain, increased risk of bone fracture, and spinal cord compression.[2] These lesions can be treated using biophosphonates or radiation, though new solutions are being tested in clinical trials.