Microscopic colitis (MC) is a condition that includes a spectrum of histological
abnormalities of the colonic mucosa, ranging from an increase in the number
of intraepithelial lymphocytes (IELs) (‘‘lymphocytic colitis’’,
or LC) to a diffuse lymphoplasmocytic infiltrate of the lamina propria,
prominent intraepithelial lymphocytosis, and the formation of a thick
subepithelial collagen band (‘‘collagenous colitis,’’ or CC).
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