الفهرس 
Introduction and aim of the workOnly 14 pages are availabe for public view
 |  | from | 166 |  |  |
| | | from | 166 | | |
Abstract
Congenital vascular malformations usually present as well defined small circumscribed lesions or as complex vascular masses affecting both the venous and arterial systems. These vascular anomalies are divided into low flow vascular malformations, high flow arteriovenous malformations or hemangioma according to their natural history, clinical appearance, and histological nature. The different morphologic and functional lesion characteristics of the vascular malformations have been evaluated using different diagnostic imaging tools, however sub-classifications of congenital vascular malformations remain poorly structured. Treatment plan for vascular malformations depends on localization of the lesion and includes both minimally invasive interventional procedure and surgery. Optimal treatment planning and hence optimal outcome require accurate evaluation of the vascularity. Catheter digital subtraction angiography and duplex sonography were used as techniques to assess these conditions. Recently, MR angiography, which allows the noninvasive evaluation of vasculature has become alternative method of evaluation. MRI has been shown to be most accurate in the evaluation and characterization of the type of the vascular malformation as the use of T2 WI can differentiate high flow arteriovenous malformation from low flow venous angioma and STIR images can show the exact anatomical extent of the lesion.