The size of DCIS is important for surgical planning. The larger the DCIS, the larger the amount of breast tissue needing to be removed will be. In the case of a lumpectomy, as more tissue removed, a larger defect is left in the breast.
The location of the DCIS is important for surgical planning. There are areas of the breast that tolerate removal of tissue with a little cosmetic change And other areas where the defect can be very noticeable.
Patient preference is important for surgical planning. Some patients prefer removal of the breast over removal of the lump or vice versa.