Fig. 4From: Tenosynovial giant cell tumors in unusual locations detected by positron emission tomography imaging confused with malignant tumors: report of two casesBiopsy specimen showed small mononuclear stromal cells with stromal fibrosis, including formation of a hyalinized collagen matrix and a small area of multinucleated osteoclast-like giant cells (hematoxylin and eosin staining; scale bar, 100 μm) (a). Immunohistochemical analysis showed strong staining for CD68 (b)Back to article page