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Imaging features were correlated with genotypes in 75 patients with hereditary hemorrhagic telangiectasia. Sixty-one percent of patients showed small, superficial, capillary malformations without shunting, whereas 43% had true AVMs of small size and low Spetzler-Martin grade. High-flow AVFs were present in 12% of patients and multiple malformations were seen in 44%. No correlation between gene mutations and lesion types was found.