The utility of intraoperative retroareolar margin frozen section assessment and the management of atypical epithelial proliferative lesions at the retroareolar margin in nipple-sparing mastectomies

•Frozen sections of retroareolar margins is accurate and can optimize surgery.•Atypical lesions at the retroareolar margin can safely be managed conservatively.•Pagetoid spread along nipple ducts may predict nipple-areolar complex involvement.