Ganglion Cysts Overview
Ganglion cysts arise from the capsule of a joint or the sheath of a tendon. They can be found at different places on the wrist. A ganglion cyst that grows on the top of the wrist is called a dorsal ganglion. Others are found on the underside of the wrist between the thumb and your pulse point, at the end joint of a finger, or at the base of a finger. Most of the time, these are harmless and will often disappear in time.
A ganglion cyst contains a thick, clear, mucus-like fluid similar to the fluid found in the joint. No one knows what triggers the formation of a ganglion. Women are more likely to be affected than men. Ganglia are common among gymnasts, who repeatedly apply stress to the wrist.