Stewart–Treves syndrome, refers to a lymphangiosarcoma, a rare complication that forms as a result of chronic, long-standing lymphedema. Although it most commonly refers to malignancies associated with chronic lymphedema resulting from mastectomy and/or radiotherapy for breast cancer,[1] it may also describe lymphangiosarcomas that result from congenital and other causes of chronic secondary lymphedema.[2] Lymphangiosarcoma arising from cancer-related lymphedema has become much less common with better surgical techniques, radiation therapy, and conservative treatment.[3] The prognosis, even with wide surgical excision and subsequent radiotherapy, is poor.[4]