Abstract
Radiation-induced sarcoma (RIS) is a late complication of breast cancer radiotherapy, with a very low incidence, long latent period and poor prognosis. Among them, leiomyosarcoma after radiation is an extremely rare radiation-associated sarcoma. In this study, we report a case of radiation-induced leiomyosarcoma 2 years after postoperative radiotherapy for breast cancer. After the diagnosis of leiomyosarcoma, the patient received radical resection of the left chest wall leiomyosarcoma. The patient showed no relapse or progression during the follow-up time of 1 year after operation. Rare occurrence of RIS induced by postoperative radiotherapy in breast cancer and limited experience concerning its diagnosis and treatment bring obstacle to both patients and doctors. Preoperative examinations must be carefully refined. With a perfect coordination between different disciplines, RIS induced by postoperative radiotherapy in breast cancer can be ideally treated with better prognosis.