”Undifferentiated” uterine sarcoma, or ”high-grade” endometrial stromal sarcoma (ESS), is a rare neoplasm characterized by early visceral organ dissemination and poor prognosis. We present a case of a 48-year-old woman with ”undifferentiated” uterine sarcoma. She was treated and staged by surgery with adjuvant pelvic irradiation. Metastases of left supraclavicular fossa (SCF) and axillary nodes developed 5 and 9 months after the surgery. Salvage radiotherapy alone was delivered to left SCF region. Furthermore, axillary nodal dissection followed by local radiotherapy was done for left axillary Iymphadenopathies. She is alive without evidence of disease and doing well 64 months after the diagnosis of uterine sarcoma. In conclusion, isolated SCF and axillary lymph node metastases are unusual sites of relapse for ”undifferentiated” uterine sarcoma. Aggressive radiotherapy with or without surgery may achieve longer survival for such patients with oligometastases of distant nodes.