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Distal femoral metaphyseal eccenteric aggressive marrow lesion that displays low signal in T1 with small high signal foci likely hemorrhage and heterogenous signal in T2, high signal in STIR and avid enhancement in post contrast study. There is associated cortical destruction, extraosseous soft tissue extension, periosteal infiltration and marrow edema and microinvasion of the adjacent area of distal femur.
Diagnosis: Osteogenic sarcoma (histologically proven)