An Uncommon Pairing of common Tumors: Case Report of Ductal Carcinoma in situ Within Fibroadenoma.

: Fibroadenomas are common benign tumors of the female breast. In the appropriate clinical setting, they are often managed expectantly without excision. Rarely, cancer may arise within a fibroadenoma, and this diagnosis mandates prompt treatment for malignancy. We present the case of a 70-year-old Samoan woman with ductal carcinoma in situ (DCIS) arising within a fibroadenoma. Health care practitioners should be aware of the possibility, particularly in older women, of finding carcinoma within a fibroadenoma, which informs the rationale for prompt surgical evaluation and follow up of all breast masses.