What Is a Ganglion Cyst?
A ganglion cyst is a sac filled with a jellylike fluid that originates from a tendon sheath or joint capsule. The word “ganglion” means “knot” and is used to describe the knot-like mass or lump that forms below the surface of the skin.
Ganglion cysts are among the most common benign soft-tissue masses. Although they most often occur on the wrist, they also frequently develop on the foot – usually on the top, but elsewhere as well. Ganglion cysts vary in size, may get smaller and larger, and may even disappear completely, only to return later.
Although the exact cause of ganglion cysts is unknown, they may arise from trauma – whether a single event or repetitive micro-trauma.
A ganglion cyst is associated with one or more of the following symptoms:
- A noticeable lump – often this is the only symptom experienced
- Tingling or burning, if the cyst is touching a nerve
- Dull pain or ache – which may indicate the cyst is pressing against a tendon or joint
- Difficulty wearing shoes due to irritation between the lump and the shoe
A diagnosis would usually consist of ultrasound imaging to observe area below skin level. But in certain cases a small sample may be removed for investigation (biopsy).
- Monitoring, but no treatment. If the cyst causes no pain and does not interfere with walking, the surgeon may decide it is best to carefully watch the cyst over a period of time.
- Shoe modifications. Wearing shoes that do not rub the cyst or cause irritation may be advised. In addition, placing a pad inside the shoe may help reduce pressure against the cyst.
- Aspiration and injection. More than one session may be needed. Although this approach is successful in some cases, in many others the cyst returns.
- Therapeutic Ultrasound . In some patients this has been helpful in reducing the mass and reducing pain
- Kinesiology taping
When is Surgery Needed?
When other treatment options fail or are not appropriate, the cyst may need to be surgically removed. While the recurrence rate associated with surgery is much lower than that experienced with aspiration and injection therapy, there are nevertheless cases in which the ganglion cyst returns.