Vascular lesions of the gastrointestinal tract are clinically highly relevant, and are a common cause of gastrointestinal bleeding. Among these lesions, gastrointestinal angiodysplasia is frequently encountered, whereas Dieulafoy lesion and gastric antral vascular ectasia (GAVE) are less common. An understanding of the other described lesions is important, despite their rarity, because they are frequently misdiagnosed and mistreated. For example, historically most rectal hemangiomas were misdiagnosed and mistreated as internal hemorrhoids.
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