Abstract
Brain AVMs are rare and complex vascular lesions of unknown etiology, with the incidence rate of newly diagnosed cases of approximately 1–1.5 in 100,000 person years. Prevalence of AVMs in the population is unknown, but may be as high as 0.2%, even though the prevalence of confirmed AVM diagnosis is only 0.02%. AVMs seem to be slightly more common in males. Although the incidence of unruptured and asymptomatic AVMs is probably gradually increasing with the availability of noninvasive imaging, the most common and dangerous form of presentation of an AVM is still hemorrhagic stroke. Epileptic seizures, headache and focal neurological deficits are other forms of presenting symptoms. Although intracranial hemorrhage caused by an AVM may be somewhat less harmful than hemorrhagic strokes by other causes, AVM hemorrhage typically affects younger populations, and untreated AVMs are associated with significant long-term excess mortality. Average annual risk of rupture of an all untreated AVMs combined is between 2% and 4%, but the risk is highly variable and depends on the individual characteristics of the lesion. Factors associated with increased risk of hemorrhage include previous rupture, deep and infratentorial location, deep venous drainage, associated aneurysms and possibly large size.
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Laakso, A. (2017). Epidemiology and Natural History of AVMs. In: Beneš, V., Bradáč, O. (eds) Brain Arteriovenous Malformations. Springer, Cham. https://doi.org/10.1007/978-3-319-63964-2_4
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DOI: https://doi.org/10.1007/978-3-319-63964-2_4
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