类风湿性关节炎滑膜病理 PATHOLOGIC FINDING / 1. chronic synovitis In acute phase: effusion and cell infiltration In chronic phase the number of a type cell remarkably increases the pannus erodes cartilage bone ligaments and tendons 2. extra-articular: vasculitis rheumatoid nodulePATHOLOGIC FINDING 1. chronic synovitis In acute phase: effusion and cell infiltration In chronic phase: the number of A type cell remarkably increases the pannus erodes cartilage, bone, ligaments and tendons. 2. extra-articular：vasculitis、rheumatoid nodule