Abstract
A patient, 54–year–old female, started to have a systemic chemotherapy for the metastasis of breast cancer to cervical nodes, bones and appearance of malignant left pleural effusion two years after the left mastectomy for breast cancer. The patient developed acute peritonitis three months after starting the chemotherapy and an emergent laparotomy was performed. A perforation of the small bowel by metastatic cancer was the cause of the peritonitis. The patient showed temporary improvement of the clinical picture, but soon developed malignant meningitis and died. Perforation of small bowel due to metastatic breast cancer is extremely rare, but it is important to consider its possibility in case of prolonged prognosis in breast cancer as the potential metastasis of the cancer to intestinal tract is not rare.
