PEIR Digital Library

Welcome to the Pathology Education Informational Resource (PEIR) Digital Library, a multidisciplinary public access image database for use in medical education.

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DIAGRAM: GASTROINTESTINAL: GI: ARTERY: Pathogenesis of Atherosclerosis - 12 of 13; As smooth muscle cells, connective tissue, lipid, and necrotic tissue build up in the intima, a "complicated lesion" is formed. The complicated lesion is a fibrous plaque that has become altered as a result of hemorrhage, calcification, ce