BRCA1 and ductal breast carcinoma in situ: To the best of our knowledge, the current study is the first to report the rates of MRI-only diagnosed occult DCIS in BRCA1/BRCA2 PSV carriers—2.6% (29/1100) over a 5-year surveillance in a single medical center in Israel, and the rate of biopsy-diagnosed “pure” DCIS was 13.9% (29/209).