HealthInfo West Coast-Te Tai Poutini
Ganglion cyst
Whēwhē pona
A ganglion is a fluid-filled swelling or cyst that is near a tendon or joint.
Ganglion cysts look like smooth soft lumps under the skin. They are formed when some of the jelly-like fluid that is in the joint (called synovial fluid) leaks out. We do not know exactly what causes them. Sometimes they also go away by themselves, without any treatment.
Ganglion cysts are most common on the back of the wrist or the top of the foot, but they can happen anywhere. They are not harmful and are not cancer. But if they are large, they can sometimes be painful or can look unattractive.
A doctor can usually diagnose a ganglion cyst simply by seeing it and you will not need any further tests.
Treating a ganglion cyst
You only need treatment for a ganglion if it is causing pain or problems when moving your joint, or if you think it looks very bad. Your doctor may recommend you wait to see if it changes. If it is painful, using a simple, soft, elasticated wrist support when you are doing anything that makes it hurt might help.
Your general practice team can try sucking out (aspirating) the fluid with a needle and syringe. The fluid is quite thick, so this does not always work, and the ganglion cyst often comes back. Adding a steroid injection at the same time can help reduce the chance of it coming back.
If your general practice team is not experienced at giving steroid injections, they will be able to refer you to a general practice team that is. Musculoskeletal specialists can also inject steroids.
If your ganglion cyst is causing significant pain or problems, your general practice team can refer you to a plastic or orthopaedic surgeon. The surgeon will investigate whether surgery is an option.
Surgery to cut out the ganglion cyst has the best chance of curing it. But this is not routinely offered for all ganglion cysts through the public system. There is also a 5% to 10% chance that the cyst will come back in the same position after surgery.
You could choose to pay to see a private plastic surgeon or private orthopaedic surgeon.
HealthInfo recommends the following pages
- NHS – Ganglion cyst
This British site explains what causes ganglion cysts and the treatment options.
Written by HealthInfo clinical advisers. Last reviewed November 2024.
SourcesReview key: HIGGL-13830
