Giant cell tumor of soft tissue: FNA cytopathology of 4 cases, review of the literature, and comparison with giant cell tumor of bone.

GCT-ST FNA smears mimic those of GCTBs containing a limited population of uniform spindle cell clusters, single dispersed polygonal cells, and cytologically banal OLGCs. GCT-ST should be considered in the differential diagnosis of aspirates containing numerous osteoclast-like giant cells.