[Stewart-Treves syndrome].

A Stewart-Treves angiosarcoma (Stewart-Treves syndrome) developed 14 years after mastectomy (Halsted) and radiotherapy for breast cancer in a woman now 56 years old. Limited excision, graft and complementary radiotherapy have controlled the disease for 20 months. The microscopical and ultrastructural features of this angiosarcoma are presented and the last advances in immunopathology briefly commented.