Histologic sections from the excision showed apocrine ductal carcinoma in situ (DCIS) arising in a complex sclerosing lesion
characterized by extensive adenosis with apocrine "atypia" and stromal fibrosis (Figure 2, a through d).
Metaplastic spindle cell breast tumors arising within papillomas, complex sclerosing lesions
, and nipple adenomas.
Despite being considered benign lesions, radial scars (RS) and complex sclerosing lesions
(CSL) of the breast often demonstrate suspicious imaging features that prompt imaging-guided core needle biopsy.