Multiple metastases of bones and sigmoid colon after mastectomy for ductal carcinoma in situ of the breast: A case report

The prognosis of ductal carcinoma in situ (DCIS) is reportedly well. Extremely rare patients with DCIS develop distant breast cancer metastasis without locoregional or contralateral recurrence. This is the first report of multiple bones and sigmoid colon metastases from DCIS after mastectomy.