Breast-cancer related lymphoedema (BCRL) is a common phenomenon. Estimates of incidence rates have varied over time, especially since the progression to less invasive techniques as sentinel node procedures and radiotherapy. According to a review article of DiSipio the incidence of arm lymphedema was about four times higher in women who had an axillary lymph node dissection (18 studies; 19.9%, 13.5-28.2) than in those who had sentinel lymph node biopsy (18 studies; 5.6%, 6.1-7.9). Several other risk factors are already suggested as having a negative impact on the development of lymphedema such as BMI and chemotherapy. A comprehensive overview of all treatment related risk factors and patient related risk factors, including demographics, has not been reported yet.