A-B, Microscopic appearances of the tumor, showing a polymorphic infiltrate of histocytes and a multinucleated giant cell embedded in the fibrotic stroma. Xanthomatous foamy cells and lymphocytes were also noted, but there was no mitotic figure and no villous projection of the synovium (hematoxylin and eosin, original magnification ×100, ×400). Arthroscopic Resection of a Tenosynovial Giant Cell Tumor in the Wrist: A Case Report: Lee YK, Han Y, Lee M - Medicine (2015). Not altered. CC.