Definitions for "Ductal carcinoma in situ"
Malignant epithelial proliferation occupying duct spaces but confined within the basement membrane. It is a heterogeneous entity, radiologically, pathologically and biologically.
DCIS is an early form of breast cancer that starts in the milk ducts. See breast cancer section.
Cancer that begins in the ducts of the breast, but has not grown through the duct wall into the surrounding tissue.