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Idiopathic Angiodysplasia

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Angiodysplasia can be defined as the presence of abnormal, ectatic, dilated, tortuous and usually small (<10 mm) blood vessels within the mucosal and submucosal layers of the gastrointestinal tract. In this condition the affected vessels appear, at histologic examination, as thin, tortuous with the absence of an internal elastic layer.
The pathophisiology is still unknown, but this condition tend to be acquired after chronic degenerative process associated with aging.
It was suggested that angiodysplasia develops after chronic repeated muscolar contraction resulting in an increased intraluminal pressure with partial obstruction of the veins. Veins and venules start draining into submucosal vein with dilatation of the capillary ring and consequently due to …show more content…
They may be associated with underlying predisposing factors like hereditary hemorrhagic telangiectasia syndrome or patients undergoing hemodialysis. Idiopathic angiodysplasias are more common, typically occur in patients older than 60 years and are incidentally found in 1-2% of all asymptomatic patients undergoing colonoscopy. Most angiodysplasias will never bleed, but those that do make up 5% of overt upper GI bleeds.
Clinically patients may present with hematemesis, melena, or chronic gastrointestinal blood loss resulting in anemia with associated iron deficiency.
Endoscopic imaging is currently the main tool for diagnosis in the upper and lower GI tract and allows the recognition of this vascular abnormality. Angiodysplasias characteristically appear as small (5 to 10 mm), flat, cherry red lesions with an arborizing pattern resembling a fern-like appearance expression of ectatic blood vessels that radiate from a central vessel.
However endoscopy may miss these lesions due to a variety of reasons, for example, operator experience, poor visibility in case of hemorrage, and when are small in size and located behind mucosal

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