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A ganglion is a fluid filled outpouching of the membranes (synovium) that line the wrist joint. It is caused by a defect in one of the joint capsules, which allows an outpouching (herniation) of the joint membranes through the defect. The cyst so produced is filled with the normal joint lubricating fluid (synovial fluid). In children, ganglia are benign. They tend to disappear over time, so we usually just reassure the parents and wait a while. If a ganglion is sufficiently large, causes pain, or interferes with normal tendon functioning, it can be either aspirated (a needle is inserted into the cyst and the fluid removed) or surgically excised.