ABSTRACT
Classification of vascular anomalies was difficult and confused in the past due to variability of the diseases. Former syndrome-based or hemodynamic-/flow-based classification failed to make a clear distinction between the different forms. The anatomopathological Hamburg classification, mostly accepted in the past, made a simple division between the different types of anomalies.
The new classification of the International Society for the Study of Vascular Anomalies (ISSVA) developed and extended the Hamburg one with a multilevel system of subgroups that made it possible to include all new knowledge and to adapt and extend it according to knowledge development, including the new genetic data.
