Tenosynovial giant cell tumors (TGCT) actually are a family of neoplasms most often arising from the synovium of joints, bursae, and tendon sheaths. There are two subtypes:

  • Localized tenosynovial giant cell tumor (LTGCT)

  • Diffuse tenosynovial giant cell tumor (DTGCT)

These two subtypes have different clinical behavior: → see dedicated sections for more details.