A ganglion is a benign fluid-filled mass that typically forms in the soft tissues of the wrist or hand near joints or tendons. It feels like a firm lump and can be painful, especially when pressure is applied. Common locations include the back of the wrist (dorsal wrist ganglion), palm side of the wrist (volar wrist ganglion), base of the finger on the palm side (ganglion/retinacular cyst) or at the top of the end knuckle of the finger (mucoid cyst). Treatment can often be non-surgical, including observation. If cysts are symptomatic, aspiration can be attempted in the office. If non-operative treatment fails, surgical options exist. Ganglion surgery involves complete removal of the cyst and any attached tissue.