Symptoms of recurrence of giant cell tumor of knee tendon sheath include bone and joint compression manifestations as well as imaging manifestations under magnetic resonance. Surgery is the main treatment method for giant cell tumor of tendon sheath, but incomplete surgical resection will easily cause recurrence, and the recurrence of giant cell tumor of tendon sheath of knee joint has the following manifestations. 1. Compression manifestation: it is asymptomatic and substantial mass, invading the knee joint capsule will cause deformity, and long-term compression of the surrounding bone will form external compressive bone destruction. 2. Magnetic resonance imaging: T2-weighted image has clear boundaries, with varying signals. If the recurrent giant cell tumor wraps the tendon, low-signal tendon shadows can be seen in the tumor. Magnetic resonance is also the primary method of reviewing for recurrent giant cell tumor of the tendon sheath. If the knee tendon sheath giant cell tumor recurrence, you should go to the hospital in time, under the guidance of the doctor standardized treatment.