Histology from a bone biopsy from proximal femur is given below of a 50 year old with bone pain.  What is your diagnosis?
Ref. Robbins Pathology. 9th edition. Page. 1191
 
Paget Disease

Diagnostic features are increased osteoclastic and osteoblastic activity with supportive radiologic findings
Acute: primarily woven bone; focal mosaic pattern of lamellar bone, resembles jigsaw puzzle with prominent irregular cement lines; osteoclasts present at surface of bone but don’t tunnel; in osteolytic phase, osteoclasts may have up to 100 nuclei
Chronic: thick trabeculae and thicker bones; fine fibrosis of marrow (Osteosclerotic stage)
The picture is also known as mosaic pattern of bone
Osteomalacia
Paget’s disease
Osteoporosis
Osteosclerosis