[Two Cases of Peritoneal Dissemination after Resection for Breast Cancer]

Case 1: A 64-year-old woman underwent mastectomy for left breast cancer. A CT scan 5 years 9 months postoperative showed abdominal wall swelling, irregular soft tissue tumor, and irregular peritoneal thickening. She received chemotherapy for 2 years 4 months. Case 2: A 62-year-old woman underwent mastectomy for right breast cancer. A CT scan 10 years postoperative showed numerous nodules in the mesenterium and a swollen intestinal wall of the transverse colon and rectum. She received chemotherapy for over 2 years 9 months. Recurrence of peritoneal dissemination after resection for breast cancer is rare. When peritoneal dissemination is detected after breast cancer surgery, possible breast cancer recurrence should be considered when administering diagnosis and treatment.