Eosinophils infiltrate the colonic mucosa in response to tissue-invading
parasites, as part of eosinophilic gastroenteritis (EoG), or as an isolated
presumably allergic phenomenon.
Focal infiltrates around parasite fragments are easily recognized and the
simultaneous involvement of stomach or small intestine readily leads to
a diagnosis of EoG. In contrast, no established criteria exist for the
diagnosis of primary eosinophilic colitis.
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