1 Arthritis: Two forms of arthritis that may affect the spine are osteoarthritis and rheumatoid arthritis.  Heredity: If the spinal canal is too small at birth, symptoms of spinal stenosis may show up in a relatively young person. Structural deformities of the involved vertebrae can cause narrowing of the spinal canal.
Ductal carcinoma in situ (DCIS) is the most common type of non-invasive breast cancer. DCIS is called non-invasive because it hasnât spread beyond the milk duct into any normal surrounding breast tissue. DCIS isnât life-threatening, but having DCIS can increase the risk of developing an invasive breast cancer later on.
Some cases of breast cancer, especially low-grade DCIS, may be treated by surgery alone; some cases of breast cancer are treated with a combination of surgery, chemotherapy, radiation therapy, and anti-estrogen therapy.