Ganglion cysts are small fluid filled outpouchings of the joint space or tendon sheath. They are common around the wrist and ankle. Most are not painful but create irritation because they cause swelling and interfere with shoe wear. The initial treatment is to aspirate the fluid in the cysts and inject a small amount of cortico-steroid into the cyst. This is successful in roughly half of the cases. Surgery to remove the cyst is a minor outpatient procedure. Recovery is usually quick after surgery and recurrence is uncommon.