Inflammation of tissues external to the colon or of the outer layers of the colon.
From 'exo-' (outside), 'col-' (from colon), and '-itis' (inflammation), following the standard medical nomenclature for inflammatory conditions of organs and tissues.
Exocolitis is actually a misnomer in most modern medical texts—doctors now prefer more specific terms like pericolitis (inflammation around the colon) since 'exocolitis' can be ambiguous about which tissues are inflamed.
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