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Staging of osteoblastic osteosarcoma on left distal femoral diaphysis (asterisk) in a six-year-old boy. There is proeminent spiculated periosteal reaction (arrow) at plain radiography, with soft tissue components and diffusion restriction on MRI (c,d). There are no secondary distant lesions or skip lesions. a: coronal STIR sequence; b: coronal T1-weighted sequence; c: coronal DWIBS; d: inverted black-and-white gray scale DWIBS.
