A ganglion is a small sac (cyst) filled with clear, jellylike fluid that
often appears as a bump on the hands and wrists. Ganglion cysts are usually
small and round and can feel soft, firm or rubbery to the touch.
Most patients notice that the cysts appear suddenly. They may grow as activity
increases, because more fluid collects in the sac. Ganglion cysts are
not cancerous.
Causes
The cause of ganglions is not known, but it may be a reaction to an injury
that causes the tendon sheath (which covers the tendon) or joint capsule
(which protects the joint) to form extra fluid and balloon out.
Symptoms
Ganglion cysts are often painless, but depending on location, they may
cause enough discomfort to need treatment. If a ganglion cyst presses
up against a nerve it can cause symptoms that include numbness, tingling,
a weakened grip and a reduced range of motion.
Diagnosis
ValleyOrtho’s physicians can diagnose a ganglion cyst based on what
it looks like, whether it feels tender when pressure is applied, and its
location. Because a ganglion cyst is filled with fluid, the physician
may also shine a small light, such as a pen light, through it to confirm
that it is a ganglion cyst. If a diagnosis is still not certain, the physician
may order an X-ray to rule out more serious medical conditions, or an
ultrasound to confirm that the lump is a cyst.
Treatment
Often, ganglion cysts can be resolved with nonsurgical techniques such
as splinting and anti-inflammatory medication. Ganglion cysts may resolve
on their own, but if a ganglion cyst is painful, causes pressure on a
nerve, or limits activity, it may need to be drained (aspirated), or surgically removed.
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