Subtalar joint pigmented villonodular synovitis misdiagnosed at the first visit: A case report

Figure 5 The postoperative histological examination images. A: Dark brown and yellow soft pathological tissue mixed with a small amount of cartilaginous tissue; B: The pathological synovial tissue presented as villous nodular hyperplasia, with hemosiderin deposition (black arrow). Numerous multinucleated giant cells stained with hemosiderin (black circle).