“…Indications for tendoscopy of the PTT include tenosynovitis, tendinosis, degenerative tears, tendon adhesion, and dislocation. 14-17 In these patients, hydrocele of the PTT sheath was seen on MRI and tenosynovitis was suspected 18 , although tenosynovitis was not particular, and rupture of the cartilaginous bed was detected. Leakage of joint fluid into the tendon sheath after injury to the joint capsule or ligament can be confirmed by arthrography.…”