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-LATE STAGE; Arrow on Synovial Pannus -- Physical deformities occur during the late stage of rheumatoid arthritis. Erosions in articular cartilage cause a narrowing of the joint space and a destabilization of the structural elements. Deep erosions in