Patient: June 2012 began to have a soybean grain size, now there is about 1 cm of the lump, no pain if not do surgery there are other treatment methods? Beijing Jishuitan Hospital Hand Surgery Department Liu Bo: Hello, the back of the wrist tendon sheath cyst is a benign small swelling, the contents of mucus, often and wrist joint cavity connected. If there is no pain and no symptoms, you can observe. If the pain significantly affects the joint activities, or the swelling grows too big to affect the aesthetics or is about to rupture, surgical treatment can be carried out. There are two types of surgery, one is traditional surgery to cut and remove. The other is minimally invasive surgery with a wrist arthroscope, where the surgical scar will be more hidden.