In a nutshell, what is paget's disease of the bone?

Which one: Paget's disease is a disorder that involves abnormal bone destruction and regrowth, which results in deformity.The cause of paget's disease is unknown, although it might have to do with genes or a viral infection early in life. There is another one called Paget disease of the breast. Good luck thanks.

Benign usually: Bone enlarges, can be painful, rarely can lead to malignancy.

Fracture: Pathologic fracture is also a potential complication.