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Site of involvement. The sites of involvement are included in the figure; femur 6 cases; thoracic spine 6 cases; lumbar spine 5 cases; skull 4 cases; ileum 4 cases; rib 2 cases; sacrum 2 cases; scapula 2 cases; sternum 2 cases; clavicle 1 case; humerus 1 case; mandible 1 case; cervical spine 1 case; tibia 1 case; ulna 1 case
