A cystic protrusion of the wrist is one of the symptoms of a tendon sheath cyst. Thecal cyst is the most common type of mass on the dorsal side of the wrist and can also occur on joint capsules and tendon sheaths in other parts of the body. Prevention and relief of thecal cysts: 1. Early, wrist braking in neutral position. Non-medial flow and septic inflammation, can be injected into the carpal tunnel prednisolone acetate, usually can receive the effect effect, should be careful not to inject the drug into the median nerve, otherwise may be due to steroid crystals a two and chemical inflammation, but aggravate the symptoms. 2.Tendon cysts within the carpal tunnel, chronic synovitis of long duration, benign mid-stream and ectopic muscle belly should be surgically removed. 3, due to the thickening of the carpal tunnel wall, the transverse carpal tunnel stenosis is feasible for decompression of the transverse carpal ligament incision. 4.When the median nerve is found to be stiffened or limitedly enlarged during surgery, extra-neural membrane incision should be made, and inter-neural bundle scar excision neurolysis should be performed.