The postoperative course was uneventful, and the patient has remained recurrence-free for six months after surgery. Notably, final pathological examination confirmed independent ductal carcinoma in situ (DCIS) components with OCGCs in both breasts, supporting the diagnosis of bilateral primary tumors rather than metastatic disease. Immunohistochemically, the OCGCs were CD68-positive, confirming their macrophage lineage. Genetic testing showed no pathogenic <i>BRCA1/2</i> variants. This evidence concerns the gene BRCA1 and ductal breast carcinoma in situ.