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File:IPLab6PAN4.jpg|This is a low-power photomicrograph of a mesenteric vessel from this case of polyarteritis nodosa (arrow). The vessel is completely occluded by thrombotic material and the vessel wall is infiltrated with inflammatory cells.
File:IPLab6PAN5.jpg|This is a higher-power photomicrograph of this mesenteric vessel. Note the thrombotic material occluding the vessel (arrows) and the inflammatory cell infiltrate in the wall of the vessel and in the surrounding adventitia.
File:IPLab6PAN7.jpg|This is a high-power photomicrograph of the vessel wall. There is hemorrhage and infiltration with inflammatory cells--primarily neutrophils (arrows).
File:IPLab6PAN8.jpg|This is a high-power photomicrograph of a small vessel with a rim of fibrinoid necrosis (arrow).
File:IPLab6PAN11.jpg|This is a low-power photomicrograph of the heart. There are areas of fibrosis in the myocardium (arrows). Note that the large epicardial coronary artery is normal.
File:IPLab6PAN12.jpg|This is a higher-power photomicrograph of the affected vessels in the heart (arrows). There are areas of fibrosis (old infarcts) in the myocardium adjacent to these affected vessels.