A ganglion cyst is a benign fluid filled sac that is usually attached to a joint or a tendon sheath (covering around a tendon). We find them often around the wrist and hand, though they can be found in other areas of the upper and lower extremities. A ganglion cyst is caused by irritation of the nearby structures which then produce fluid that fills the sac. Many times ganglion cysts can be treated successfully with conservative measures. When resistant to these treatments, surgery may be needed to remove them. Dr. Vizzi can guide you through the treatment options for ganglion cysts.