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GANGLIONS (also known as ganglia) are benign synovium-lined cystic collections of fluid and are the most common cause of lumps in the hand and wrist.

They are most common in 20- to 40-year-olds and are caused by injury or damage to a nearby anatomical structure.

Though we do not know the exact mechanism of formation, we do know that it is a fluid-filled sac arising from the area of injury. As the ganglion grows, it expands towards the region of least resistance, usually the skin.

Eventually, it is similar to a balloon with a long neck (or stalk) which bulges the