Ganglions are small, non-cancerous, soft tissue tumours that commonly develop on the dorsal (back) aspect of the wrist at the dorsal scapholunate ligament or at the metacarpal heads (base of the fingers). They are small cysts filled with a thick, sticky, clear material. The cause of ganglions is unknown however they are more common when there is a history of repetitive wrist activity with sports or occupation, and are more common in people aged under 35. Ganglions typically present as dorsal (back) wrist pain made worse with wrist extension. There may also be a visibly present nodule which is tender to touch.