Both tendons and joints have a lubricating liquid known as synovial fluid. Should a weak spot develop in the sheath surrounding the tendon or the capsule enclosing the joint, this fluid may leak out. In doing so, it forms a balloon like structure known as a ganglion cyst. These cysts often present as a lump, frequently on top of the foot or ankle, and often without pain. Our doctors at Foot & Ankle Institute can readily identify these by utilizing ultrasound. A simple and painless drainage of the cyst often results in a cure. More resistant cysts may require surgical removal.