Paget disease of bone: diagnosis and drug therapy.

Paget disease of bone is a focal disorder of aging bone that may be asymptomatic or may present with pain, bowing deformity, fracture, or a nonspecific rheumatic complaint. It is the second most common disease of bone in the elderly after osteoporosis, and the loss of structural integrity in affected bone conveys a risk of fracture. It may occur sporadically or in geographic or familial clusters. This article discusses the prevalence, pathology, workup, and treatment of Paget disease of bone.