Snapshot A 68-year-old man presents to his primary care physician for left leg pain. His pain has been progressively worsening over the course of a month and is present at night. Physical examination demonstrates impaired left lower extremity weakness limited by pain. A radiograph of the left hip and femur demonstrates lytic lesions and intralesional calcifications. Introduction Overview login to view 1 more bullet Epidemiology Incidence login to view 1 more bullet ETIOLOGY Pathophysiology login to view 10 more bullets Presentation Symptoms login to view 2 more bullets Physical exam login to view 2 more bullets Imaging Radiography login to view 6 more bullets CT scan login to view 2 more bullets MRI login to view 2 more bullets Studies Invasive studies login to view 6 more bullets Differential Osteosarcoma login to view 2 more bullets Ewing sarcoma login to view 3 more bullets Treatment Surgical login to view 6 more bullets Complications Fractures Metastasis (however, has low metastatic potential) Prognosis Prognostic variable login to view 3 more bullets