The dorsal wrist ganglion is the most common one with 70%, whereas the volar radial ganglion occurs with approximately 20% (Cooney, 2011).
A wrist ganglion cyst is a swelling that usually occurs over the back of the hand or wrist. Ganglion cysts are not cancerous, will not spread, and while they may grow in size, they will not spread to other parts of your body.
Ganglion cysts arise as outpouchings from fluid filled areas such as the fluid within the small joints of the wrist, or fluid within the sheath that surrounds the wrist tendons. When the fluid, called synovial fluid, leaks out from these spaces, it can become a cystic structure. They occur in patients of all ages; the etiology is unknown, though there might be a connection between joint and tendon irritation or mechanical changes.
Sometimes wrist ganglion cysts go away with no treatment, however, they can linger around or even grow larger. In severe cases the cyst may require surgical intervention to be removed.
Cooney W.P., 2011, The Wrist: Diagnosis and Operative Treatment, Lippincott Williams & Wilkins, Philadelphia, PA, p: 1137