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.