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A ganglion is a fluid-filled swelling of the lining of a joint or tendon. Although ganglions can form on any part of the foot, they most often appear on the ankle or top of the foot. Ganglions tend to change size and usually grow slowly.
If the ganglion puts pressure on nearby nerves, you may have tingling in your fingers, hand, or forearm. Some ganglions can weaken your grip or affect joint motion. How are ganglions diagnosed? A ganglion can usually be diagnosed based on how it looks and where it is. Your doctor will also feel the bump and shine a light alongside it. If the bump is a ganglion, the light usually shines through it. You may need an X-ray if your doctor suspects arthritis or injury. Some of the fluid found in the ganglion may be removed and examined.