1. Typical clinical and radiological findings in more than one bone (or clavicle alone) without significantly raised inflammatory markers | Typical clinical findings: • Bony pain +/− localised swelling • Absence of local or systemic signs of inflammation or infection |
OR | Typical radiological findings: • Plain x-rays showing a combination of lytic areas, sclerosis and new bone formation • MRI (STIR) showing bone marrow oedema, bone expansion, lytic areas and/or periosteal reaction |
2. Typical clinical and radiological findings in one bone plus inflammatory changes (plasma cells, osteoclasts, fibrosis or sclerosis) on bone biopsy with no bacterial growth |