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17-year-old boy with pelvic metastasis of renal rhabdoid tumor. (a) Non–contrast-enhanced transverse ultrasound (US) image showing the pelvic tumor (arrows). (b) After administration of 0.24 mL of perflutren contrast agent, the mass (arrows) is more echogenic, indicating enhancement of viable tumor. (c) Contrast-enhanced computed tomography (CT) image of the pelvic tumor (arrows) shows tumor configuration and definition of margins similar to that seen on US
