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: JOINT: Pathogenesis of Rheumatoid Arthritis, Graphic View-MIDDLE STAGE, bone erosion; Arrow on Bone Erosion -- The middle stage of rheumatoid arthritis is characterized by intense proliferation of the joint lining. Beneath the lining, lymphocytes and macrophages accumulate, especially around small blood vessels. The synovi