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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MONTAGE: JOINT: Course of Rheumatoid Arthritis, Biopsy and arthroscopy of synovium -- ADVANCED STAGES; left image-clinical; right image-radiograph -- BIOPSY-The synovium is at least 10 to 15 cell layers thick with multiple blood vessels, some scarred, and some with perivascular inflammation. There is extensive fibrous tissue. There is exte