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 experience.
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.
To diagnose a ganglion cyst, Dr. Wang will perform a thorough examination of the foot. The lump will be visually apparent and, when pressed in a certain way, it should move freely underneath the skin. Sometimes the surgeon will shine a light through the cyst or remove a small amount of fluid from the cyst for evaluation. Dr. Wang may order an X-ray and in some cases ultrasound or MRI.
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.
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.
This technique involves draining the fluid and then injecting a steroid medication into the mass. More than one session may be needed. Although this approach is successful in some cases, in many other the cyst returns.
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 is much lower than that experienced with aspiration and injection therapy, there are nevertheless cases in which the ganglion cyst returns.