Initially asymptomatic or mild pain
Bone pain at affected sites, often worse at night
Pathologic fractures
If skull involved, may report increased hat size, headache, decreased hearing
Paget's disease of bone
Bone tumor 
Ewing sarcoma
Multiple myeloma, myelofibrosis
Osteogenesis imperfecta
Fibrous dysplasia
Myositis ossificans
Intramedullary osteosclerosis