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a Contrast-enhanced ultrasound perfusion imaging of a small histopathologically proven lymph node metastasis. b Irregular early arterial hypervascularization at the tumor margin with wash-out beginning in the late phase. c Evaluation of the peak enhancement with significantly higher levels (yellow and green curve) in comparison with the surrounding tissue (white curve) in time–intensity curve analysis (bottom left). d Screenshot with permission of VueBox (Bracco, Italy)
