Fibroadenoma containing lobular carcinoma in situ, an unusual finding in a normally benign mass

Fibroadenoma containing lobular carcinoma in situ, an unusual finding in a normally benign mass:

Abstract

This is the case of a 27-year-old female who underwent breast lumpectomy for fibroadenoma of the left breast. Pathologic evaluation of the specimen revealed lobular carcinoma in situ (LCIS) entirely confined to a large fibroadenoma without LCIS in the surrounding breast tissue.