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A small plexiform lesion in a branch of an interparabronchial arteriole exhibits macrophages (MΦ) arrayed inside the remnants of the smooth muscle wall (open arrow), with proliferating intimal cells (IP) occluding the lumen. Adjacent branches of the same interparabronchial arteriole contain nucleated avian erythrocytes within the smooth muscle wall (open arrow). This lung from a 7 day old broiler chick was fixed by immersion in phosphate buffered formalin.
