What are ganglion cysts?

Fluid sack off joint: Joints are held together by ligaments and capsular tissue. These structures provide stability for the joint and keep the synovial fluid in place. Sometimes a small opening will develope in the capsule/ligament complex, allowing fluid to escape the joint. The body walls this fluid off in a membranous cyst. They get bigger and smaller because the communicate with the joint. They are often painless.

Fluid filled masses: Ganglion cysts are benign fluid-filled sacs that often arise from joints or tendon sheaths.

Fluid from a joint: There are not many problems associated with the wrists short of bony abnormalities. One common problem that can occur at the level of the wrists or coming from any joint is called a ganglion cyst. Ganglion cysts are not usually associated with much pain or discomfort until they become large. They extends from the joint space. It's, like blowing up a tiny balloon from between your knuckles. These often bust when a person bumps them. They will reoccur unless they are surgically tied off. I suggest you see an orthopedic surgeon to further assess and evaluate.