Arteriovenous malformations are characterized by a direct link between arteries and veins without intervening capillaries. As illustrated in this PrimeView, rupture and haemorrhage risk is high when these occur in the brain.
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Brain arteriovenous malformations. Nat Rev Dis Primers 1, 15047 (2015). https://doi.org/10.1038/nrdp.2015.47