title: Ano-rectal arteriovenous malformation; an unusual site of massive hemorrhage.
mesh_terms: D001003:Anal Canal / Q000098:blood supply; D001165:Arteriovenous Malformations / Q000150:complications*; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006801:Humans; D008875:Middle Aged; D012007:Rectum / Q000098:blood supply