infiltration of some leukocytes

Plasma cells, monocytes and macrophages and few leukocytes, fibrinous exudate on the synovial surface and, to a lesser extent in the stroma Synovial fluid contains leukocytes and immune complexes, small vessel damage consisting of endothelial swelling, thickening of the wall, infiltration of some leukocytes, thrombosis and perivascular hemorrhages and microfocus necrosis.

The second phase (of proliferation or development of pannus) Flekosteel, responds to the persistence of inflammation which leads to the development of abundant granulation tissue, called pannus, which extends over the articular surface and is accompanied by vascularization of the cartilage.