Stewart–Treves syndrome in a 78-year-old woman with a history of mastectomy with axillary lymph node dissection for breast cancer and chronic lymphoedema. Axial T2-weighted MR image showing a skin exophytic tumour developing at the palm of the wrist corresponding to an angiosarcoma (arrow). Note also the subcutaneous infiltration of soft tissue with a honeycomb pattern and the thickening of dermis indicating a chronic lymphoedema