الفهرس 
Epidemiology of Vascular MalformationOnly 14 pages are availabe for public view
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Abstract
Due to their hemodynamic effects and tendency to progress, the majority of congenital arterio-venous malformations (AVM) require treatment.
AVM are classified according to clinical severity (Schobinger classification, stages I–V) and angiographic appear-ance (types I–IV).
Depending on the type of AVM, intraarterial or percutaneous embolization is the treatment of choice, but requires specialized interventional expertise.
Important for treatment success is the elimination of the nidus, whereby the interventional treatment of congenital AVM differ from other embolization treatments.
Arterial embolization of the nidus can play many versatile roles in treating arteriovenous malformations of the body. Importance is given to classifying the AVM based on its morphological structure before applying any treatment path to accurately assess the probability of success for each therapeutic approach. The orientation of feeder vessels as well as other individual characteristics of the nidus will affect the difficulty of arterial treatment, and perhaps make it necessary to use another treatment approach. Even if the imaging workup determines that arterial treatment would not completely embolize the nidus, it is valuable as a preoperative tool to reduce an AVM’s nidal flow and diminish its high-flow nature. This can possibly increase the chance of embolization success for transvenous or direct percutaneous approaches in successful embolization.
So, to summarize, the primary aim of this study was evaluation of angiographic outcomes and occurrence of procedure related complications. The principal outcome of our study is embolization resulted in 30%-100% obliteration in 90% of patients and few peri-procedure complications were reported (n = 6; 12%).
The secondary aim of this study was to detect factors affecting the effectiveness of embolization. The results indicate that total or near-total obliteration of the lesion is more successfully performed in type I or II AVMs than in type III AVMs and using the antegrade femoral artery approach. This study showed that repetitive embolizations were associated with the development of better angiographic outcome but on the other hand increasing the peri-interventional complications, whereas individual treatment sessions seemed relatively safe.