vascular malformation is classified into two types as per the flow inside the lesion. 1) slow flow v.m. (2) High flow v.m.

High flow vascular malformation has very high velocity pulsatile flow. It has only one type that is arterio-venous malformation

Arterio-venous malformation has arterio-venous communication without any intertwining capillary bed. This communication is called nidus & it’s very important to destroy nidus for it’s curative treatment. Yake’s classification is important classification based on nidus & outflow tract.