It is a cystic swelling which contains thick jelly-like material. It is very common and is found near joints or tendons. The most common site is in the back of the wrist but may also occur in other areas such as the front of the wrist or the foot.
If left untreated, many ganglia disappear spontaneously. They are therefore best left alone if they don’t cause any symptoms. The cause is unknown.
Below is our ganglion information leaflet: