What are Ganglion Cysts?
Ganglion cysts are non-cancerous lumps that most often appear near joints or tendons in the wrist, hand, foot, or ankle. They form when fluid that normally lubricates joints and tendon sheaths collects in a sac just under the skin, creating a visible swelling. These cysts are usually round or oval, can vary in size, and may feel firm or spongy to the touch. While the exact cause isn’t always clear, they are often linked to repeated joint or tendon movement, which can increase pressure in the joint or tendon sheath and lead to fluid leakage.
Understanding Ganglion Cysts
Ganglion cysts often develop slowly and may not cause any discomfort initially. They are usually noticed as lumps near joints or tendons, and their size can change over time. While some cysts are painless, others can interfere with daily activities or cause discomfort. Common symptoms include:
- A visible lump near a joint or tendon, commonly on the wrist, hand, foot, or ankle.
- Fluctuating size of the lump, which may grow or shrink over time.
- Aching, tenderness, or discomfort, especially when moving the affected joint.
- Tingling, numbness, or weakness in the fingers or toes if the cyst presses on nearby nerves.
- Restriction of movement or difficulty using the joint in daily activities.
Causes and Risk Factors
Ganglion cysts form when fluid leaks out of a joint or tendon sheath and collects in a sac-like structure. The exact reason this happens isn’t fully understood, but certain factors may increase the likelihood of developing a cyst:
- Joint or tendon irritation Repeated stress or minor injuries to a joint or tendon may contribute.
- Age & sex Most commonly occur in people aged 20 to 40, and are slightly more frequent in women.
- Previous joint problems A history of arthritis, joint injuries, or other joint conditions may increase risk.
- Occupational & recreational activity Activities that involve repetitive use of the wrist, hand, foot, or ankle can make cysts more likely to form.
While ganglion cysts are generally harmless, these factors can influence both their development and likelihood of recurrence.
Diagnosing a Ganglion Cyst
Ganglion cysts are usually identified based on a physical examination, but additional tests can help confirm the diagnosis and understand the cyst’s size, location, and relationship to surrounding structures:
- Clinical Examination A clinician will inspect and feel the lump, assessing its size, firmness, and mobility. They may also check if the cyst transilluminates (allows light to pass through).
- Ultrasound This imaging can confirm that the lump is fluid-filled, help distinguish it from other types of masses, evaluate where the cyst is arising from (joint or tendon), and assess any other underlying conditions in the hand, wrist, foot, or ankle that could be contributing to symptoms or the development of the cyst.
- MRI Used in more complex cases or when the cyst is near nerves or deeper tissues, providing detailed information about its size, exact location, and connection to nearby joints or tendons.
Treatment Options
Most ganglion cysts are harmless and may not need treatment if they are painless and not interfering with daily activities. Treatment is considered when the cyst causes discomfort, limits movement, or affects function. Options include:
Conservative Treatments
- Observation Many cysts shrink or disappear on their own over time. Regular monitoring may be all that’s needed.
- Activity Modification Avoiding repetitive movements or pressure that aggravates the cyst can help reduce discomfort.
- Immobilisation Using a wrist or ankle brace may reduce movement and allow the cyst to settle.
Procedural Options
- Aspiration A healthcare provider can drain the cyst using a needle. This may relieve symptoms temporarily, but cysts can recur. A small amount of steroid may also be injected to reduce the likelihood of recurrence.
- Surgery If the cyst is painful, recurrent, or affecting function, surgical removal may be considered. Surgery removes the cyst along with part of the underlying joint capsule or tendon sheath to reduce the chance of recurrence.