Yellow pigment tumor that tendon sheath giant cell tumor, tendon sheath giant cell tumor hazards: limited joint activity, recurrence, malignant and so on. ⒈ joint activity is limited: tendon sheath giant cell tumor originated in the tendon sheath and synovial layer, manifested as round or oval soft tissue mass, when the mass compression of the nerve, there will be numbness, pain, and even joint activity is limited, affecting the patient’s quality of life. PEAK recurrence: tendon sheath giant cell tumor has the possibility of recurrence after treatment, which will affect the mood of patients and lead them to be in sadness, depression and other bad moods for a long time. 　　　Malignancy: the tumor cells of tenosynovial giant cell tumor grow more actively, and satellite foci may appear around the main tumor, which has the possibility of malignancy, but this situation is generally rare. When the tendon sheath giant cell tumor appears, it should go to the hospital in time and be treated under the doctor’s guidance to avoid the adverse effects.