Natural History Of Arteriovenous Malformations

Object analyse the natural history of arteriovenous malformations of the brain Methods The natural history of arteriovenous malformations of the brain was studied in 782 patients.all patiernts'data were obtained by their case histories. the 173 patients managed nonsurgically and nonradiotherapy were followed an everage 5.1 years. Results 67% of all patients occurred hemorrhage as their first symptom. 10-19 ages are the fastigium of hemorrhage.Small avms are more occur hemorrhage than large avms; reversely, large avms are more occur seizure. Avms located in frontal,temporal and pariental lobes are more occur seizure than located in other areas.Deep avms are more occur hemorrhage.The dangerous factors of hemorrhage are Avms'location and hemorrhage history. The rate of rebleeding was 12.2% in the first year after diagnosis, and 17.1% in three years after diagnosis. Five-year mortality rate after diagnosis is 7.6%. Conclusion the symptom of AVM is correlated with its size and location. Hemorrhage is the most symptom. The course of AVM related with intrinsic symptoms , its size and its location.