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Abnormal contrast enhancement of distal femoral osteosarcoma. Transverse image of the affected limb precontrast (A) and postcontrast (B) and the contralateral limb at the same level precontrast (C) and postcontrast (D). There is an intramedullary increase of 53.6 HU in the affected limb compared to 5.2 HU in the contralateral limb (window width = 350, window level = 50).
