NCIt definition : A group of non-invasive epithelial proliferations that occur in the ductal system
of the breast. The vast majority of cases arise in the terminal ductal lobular units.
This category includes atypical ductal hyperplasia, usual ductal hyperplasia, flat
epithelial atypia, and ductal carcinoma in situ. There is an increased risk for subsequent
development of invasive breast carcinoma.;