This is a randomized study comparing lymphovenous anastomosis versus conservative (compression) treatment for lymphoedema after breast cancer surgery - 50 patients to be included in each study arm. The primary endpoint is volume change measured by submersion and changes in arm circumference at defined levels from the wrist. Secondary endpoint is health related quality of life measured by questionnaire Short Form 36 (SF-36), Hospital Anxiety Depression Score (HADS), Fatigue Questionnaire (FQ) and a disease-specific questionnaire, Upper Limb Lymphedema score (ULL27).