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Angiodysplasia is the most common vascular lesion of the gastrointestinal tract, and this condition may be asymptomatic, or it may cause gastrointestinal (GI) bleeding.
polÂ·yÂ·anÂ·giÂ·iÂ·tis. Inflammation of multiple blood vessels involving more than one type of vessel, for example, arteries and veins, or arterioles and capillaries. /polyÂ·anÂ·giÂ·itis/ (-anâ³je-iÂ´tis) inflammation involving multiple blood or lymph vessels.ever, malaise, myalgia, weight loss, and autoimmunity, including antineutrophil cytoplasmic antibodies (p-ANCA). Skin lesions occur in 30 to 50%, usually presenting as purpura due to leukocytoclastic vasculitis, less commonly as nodules involving the vessels of the dermis and subcutaneous fat and ulcers.