Synovium is fibrotic and shows focal ulceration and moderate infiltration by lymphocytes, plasma cells and macrophages. There is associated capillary proliferation and mild tissue oedema. No evidence of specific granulomas. No evidence of atypia or malignancy.
Chronic synovitis in a patient who underwent diagnostic and therapeutic arthroscopic debridement.
Soft tissue fragments collectively measured 2x1.5x0.7 cm, totally embedded.
Synovium, incision biopsy: