Giant cell tumours (GCT) are benign (noncancerous) tumours that develop in the bone.
They mostly occur in the long bones found in the arms and legs. They are always found at the end of the bone next to the joint. Although they are benign, GCT can grow fast and damage the affected bone and spread to the soft tissue around it. GCT mostly affects people between the ages of 20 and 30 years old. It is also more common in women. We do not know why they arise.
Find out more about GCT in this easy-to-read factsheet.