A benign, knot-like, cystic tumor that swells on top of a joint or tendon sheath (the tissue that connects muscle to bone). A ganglion cyst most commonly appears on the back of the hand, at the wrist joint or on the palm side of the wrist.
There is no known official cause of ganglion cysts. One theory suggests that trauma (such as receiving injury or shock to the specific area of the body) causes the tissue of the joint to break down forming small cysts. However, a flaw in the joint capsule or tendon covering may also cause the joint tissue to bulge out, forming a cyst.
Most ganglion cysts cause some degree of pain, but many only cause a slight degree of swelling to the affected area.
A ganglion cyst does not need to have emergency treatment unless you have significant trauma. Many patients can opt for a treatment procedure called aspiration, where a needle is inserted into the cyst and draws out the liquid material. Then, a steroid compound is inserted into the area and the wrist is splinted.