ALL DEFINITIONSGiant Cell Tumor of the Tendon SheathDefinitionGiant cell tumor of the tendon sheath (GCTTS) is a benign soft-tissue tumor that arises from the synovial lining of the tendon sheath.Related SpecialistsShowing 3 of 18Sean PedenMDIrvin OhMDDieter LindskogMDMore Related Specialists