Ganglion cysts appear to arise often on the extensor aspect of the wrist and hand. They may be associated with the degenerative conditions of the joints. They may occur adjacent to joints, tendons, fascial planes, and within bone.
Usually soft in consistency, they may be firm to hard at times. These cysts are filled with gelatinous substance, which can be removed by a thick needle aspiration.The aspiration may be followed by steroid injection, or sometime hylase injection.
Surgery is required in recurrent cases, and it is important to excise the tail of the cyst up to the joint from which it seems to arise.
http://www.bonetumor.org/tumors-foot-and-ankle/ganglion-cyst-foot-and-ankle
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