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Necrotic bladder cancer soft-tissue metastasis. A 65-year-old man with knee pain. (A) Coronal T2W fat-saturated and (B) axial T2W images show a cystic mass (arrows) in the vastus medialis with surrounding edema. (C) Axial T1W fat-saturated post-contrast image shows thick rim enhancement (arrow) and a lack of central enhancement due to tumor necrosis
