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- Slow-flow Vascular Malformation: One of the main subdivisions of the updated version of the classification for vascular malformations. The main change was to use flow velocity as a determinant between lesions with arterial components (fast-flow) and lesions with slow-flow components such as venous, lymphatic and capillary. It is differentiated from Fast-flow lesions and developmental anomalies of named vessels lesions. Slow-flow vascular malformations can be subdivided into venous, lymphatic, capillary and combined.