Ganglion cysts are benign, fluid filled, soft-tissue masses found near the joints of the wrist and fingers (Figure 1). Ganglions usually grow out of the tissues surrounding a joint or a tendon sheath. The most common location for a hand ganglion -- accounting for more than 75% of all cases -- is on the dorsum of the wrist, emanating from the scapholunate joint. Cysts found at the DIP joint or IP joint of the thumb are denoted as “mucous cysts” and are associated with osteoarthritis. The ganglion cyst of the flexor tendon sheath is known as a “retinacular cyst.”
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