/ CONDITIONS / GANGLION CYST
Ganglion Cyst
A benign fluid-filled lump on the top of the foot or ankle — soft, moveable, and alarming to discover but not dangerous. Evaluation confirms the diagnosis and determines whether treatment is needed.
Andrew Gunter, DPM — San Antonio, TX.
Call (210) 581-9800
What Is a Ganglion Cyst?
A ganglion cyst is a benign, fluid-filled sac that arises from a joint capsule or tendon sheath. The cyst contains a thick, gelatinous fluid — similar to the synovial fluid that lubricates joints — and is not a tumor, a cancer, or an infection. It is the most common soft tissue mass of the foot and ankle, typically appearing as a smooth, rounded, somewhat firm lump that can vary in size from a few millimeters to several centimeters.
In the foot, ganglion cysts most commonly arise from the dorsal midfoot joints — particularly the tarsometatarsal and midtarsal joints — and from tendon sheaths on the dorsum of the foot. They can also develop on the plantar surface of the foot, typically adjacent to the plantar fascia or the flexor tendon sheaths — plantar ganglions are less visible but often more painful because they are compressed directly underfoot with every step. Ankle ganglions arise from the anterior or posterior ankle joint capsule.
The presenting symptom for most patients is noticing the lump — often unexpectedly, with no associated trauma or clear precipitating event. Pain is variable. Many ganglion cysts are entirely painless and discovered incidentally. Others produce aching or pressure discomfort at the site, particularly with shoe pressure across the dorsum or with joint loading. Neurological symptoms — tingling or numbness — can develop when the cyst is adjacent to a sensory nerve.
The natural history of ganglion cysts is variable and somewhat unpredictable. Some cysts fluctuate in size, appearing to enlarge or shrink over weeks to months. Some resolve spontaneously without treatment. Others persist indefinitely or enlarge progressively. This variability is clinically relevant for the management decision — an asymptomatic cyst that may resolve spontaneously does not necessarily require intervention.
Dr. Gunter evaluates foot and ankle lumps clinically and with imaging when needed — MRI or ultrasound confirms the cystic nature of the mass and rules out other soft tissue pathology. Not every lump on the foot is a ganglion cyst, and evaluation before treatment is important.
COMMON SYMPTOMS
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Smooth, rounded, firm but compressible lump
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Most common on the top of the midfoot or ankle
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Moveable — slides slightly under the skin
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May transilluminate (glow when a light is held against it)
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Variable size — may fluctuate over weeks or months
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May be painless, or produce pressure/aching discomfort
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May produce tingling if adjacent to a nerve
Note: A lump on the foot that is not smooth, not moveable, is rapidly growing, is pigmented, or is associated with significant pain at rest warrants prompt evaluation — not all foot lumps are benign ganglion cysts.
COMMON CAUSES
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You have discovered an unexplained lump on the foot
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The lump is growing or changing
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Pain or pressure is limiting activity or footwear
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You have tingling or numbness near the lump
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You want confirmation that the lump is benign
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The lump is on the plantar surface and painful with walking
Ganglion Cyst Treatment Options
Treatment depends on whether the cyst is symptomatic, its location, and the patient's preferences. Not every ganglion cyst requires treatment — observation is a legitimate choice for asymptomatic cysts. Dr. Gunter discusses the options honestly, including recurrence rates, so you can make an informed decision.
Observation
For asymptomatic or minimally symptomatic ganglion cysts, watchful waiting is a completely reasonable management approach. Some cysts resolve spontaneously. If the cyst is not causing pain or functional limitation, observation with periodic reassessment avoids the recurrence risk and recovery associated with intervention. Dr. Gunter discusses what changes in the cyst should prompt re-evaluation.
Aspiration
Aspiration involves removing the fluid contents of the cyst using a needle — a quick in-office procedure performed under local anesthesia. It provides immediate reduction in cyst size and relief of pressure symptoms. The important limitation of aspiration is a meaningful recurrence rate — the cyst wall remains in place and can refill with fluid. Aspiration is a reasonable first intervention for symptomatic cysts, particularly when the patient prefers to avoid surgery.
Surgical excision
Complete surgical removal of the ganglion cyst — including the cyst wall and its stalk to the originating joint or tendon sheath — provides a more durable result than aspiration. Recurrence rates after excision are lower than after aspiration, though not zero. Excision is performed as an outpatient procedure under local anesthesia. Appropriate for cysts that have recurred after aspiration, cysts causing significant symptoms, or patients who prefer definitive management.
Footwear modification
For dorsal foot ganglion cysts where the primary symptom is shoe pressure against the prominence, footwear with a softer upper or a wider instep that avoids direct contact with the cyst can provide meaningful symptomatic relief without intervention on the cyst itself. A practical first step for cysts that are symptomatic primarily because of shoe contact.
Related conditions: Extensor tendinitis · Nerve compression & entrapment
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Frequently Asked Questions — Ganglion Cyst
Found a lump on your foot?
Get it evaluated — most are benign, all deserve a proper diagnosis.
Dr. Andrew Gunter, DPM evaluates foot and ankle lumps — confirming the diagnosis, discussing treatment options honestly including recurrence rates, and recommending the approach that makes sense for your specific situation. Serving San Antonio and surrounding communities. Same-day appointments available. Most insurance plans accepted.
Call (210) 581-9800