Fig. 5From: Diagnostic utility of CSF1 immunohistochemistry in tenosynovial giant cell tumor for differentiating from giant cell-rich tumors and tumor-like lesions of bone and soft tissue CSF1 IHC and CSF1 split signal by FISH in TSGCT. a. CSF1-positive mononuclear tumor cells were scattered in the tumor b. The tumor cells showed a split signal pattern that consisted of a pair of split (red and green) and fused signals. The split signal was observed in 10% of tumor cellsBack to article page