A ganglion cyst is a sac filled with a jellylike fluid that originates from a tendon sheath or joint capsule. Below is a video of an aspiration of a ganglion cyst performed in the office. Ganglion cysts in the foot and ankle are pretty difficulty to treat. Sometime we can aspirate the ganglion like in the video below and it can offer a lot of relief from the pain and pressure from the cyst. However, there is a very high recurrence rate with just aspirating the mass.