The study includes a series of 39 patients with AVM of the brain that are not
subjected to any method of treatment, except for the symptomatic treatment
who were hospitalized and diagnosed AVM at the Institute of Neurosurgery,
Clinical Center, in the period 2005-2011. Results: The structure of the
patients was measured by gender are male. Average age of the respondents was
27.4 ? 7.6 years. With the average length of the follow-up of 4.8 years, new
hemorrhage occurred in 24 patients (58 episodes). Predictor (p<0.01), factors
for bleeding include: arterial supply from the VB and ACA basin and multiple
arterial supply. Conclusion: The analysis of our series may be proposed for
following model of the natural course of AVM : After initiall haemorrhage
there is annual risk of rehemorrhage of 3.33%. Bleeding events were
significantly more common in medium-sized AVM (2.5 - 5 cm), localized in
elocvent area of the brain with combined type of venous drainage, arterial
supply from the vertebrobasilar artery, anterior cerebral artery basin or
combined arterial supply.