1. The proposed classification of congenital vascular defects based on anatomic and pathological features has proved to be useful in clinical practice. It is valid for vascular defects in all locations (central, visceral and peripheral), includes all types and anatomic forms of vascular malformations, yet is quite simplified. 2. A uniform and universal classification system is necessary for clear communication between the many different specialists dealing with congenital vascular defects. 3. It offers a clear and precise descriptive system to serve as the basis for diagnosis of congenital vascular defects. 4. A unified classification system offers the possibility of uniform analysis and comparative reporting between scientific investigators working in this field around the world.