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Giant cell tumor of tendon sheath (GCTTS) is a common soft tissue tumor. Immunophenotypical evidence suggests it is of synovial cell origin. There is controversy regarding the underlying nature of this lesion, specifically whether it is a neoplastic or nonneoplastic (ie, reactive or hyperplastic) process. Karyotypic abnormalities have been identified in GCTTS and interpreted as evidence of neoplasia,...
Giant cell tumor (GCT) of bone is a locally aggressive neoplasm with a high incidence of recurrence, usually at the site of previous osseous involvement. Primary and recurrent intraosseous lesions typically are lytic and do not show evidence of tumor-associated osteogenesis. Rarely, GCT recurs or is primary within soft tissue, and not infrequently, these extraosseous lesions show metaplastic bone...
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