carcinoma in situ
[car-sin-O-ma in sy-too]
an early stage of cancer in which the cancer cells are only in the layer of cells where they first began, and have not grown into nearby tissues in other parts of the organ or spread to distant parts of the body. Most in situ carcinomas can be cured. Also called non-invasive cancer, it is not considered a “true” cancer. See also carcinoma.