How is dcis typically detected and diagnosed?

Biopsy: Ductal carcinoma in situ (dcis) is initially seen on mammogram as a cluster of abnormal microscopic calcifications in the breast. A biopsy is then done to obtain a sample of the area of breast tissue in question. When the biopsy tissue is examined under a microscope it will definitively diagnose the dcis cells.

Lump: Palpation, self exam or mammogram.