Final pathology confirmed metastatic breast carcinoma in the ovaries.<h4>Outcomes</h4>The patient successfully achieved surgical tumor reduction, recovered well postoperatively, and showed no clinical evidence of disease progression.<h4>Lessons</h4>This case highlights the distinct characteristics of ovarian metastases in HR+/HER2- breast cancer and their critical importance in differential diagnosis, particularly in distinguishing them from primary gynecologic tumors. The gene discussed is ERBB2; the disease is breast carcinoma.