Figure 20.27A) present with an erythematous or vascular nodule, which can then ulcerate or go on to form several other nodules. They can metastasize early and wide surgical excision is the treatment of choice. They are also associated with developing in areas of post-mastectomy lymphoedema, either in the chest wall or arm, often a decade after initial surgery. This phenomenon is known as the Stewart Treaves syndrome.