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.
(DCIS itself is NOT invasive.). According to the American Cancer Society, about 60,000 cases of DCIS are diagnosed in the United States each year, accounting for about 1 out of every 5 new breast cancer cases. There are two main reasons this number is so large and has been increasing over time: 1  People are living much longer lives.