Fig. 2

C-CEUS and H-CEUS images of benign nodules. The nodule was pathologically confirmed as AML. (A) A hyperechoic mass located at the inferior pole of the right kidney with a clear boundary and regular shape. (B) The time of arrival of C-CEUS, which first arrives at the periphery of the lesion (white short arrow). (C-F) The perfusion process of the contrast medium: the contrast medium enters from the periphery to the center, showing centripetal enhancement. (G) The c-CEUS peak time image shows a slightly uniform low enhancement. (H) CDFI showing punctate blood flow signal in focus, grade I. (I) The time of arrival of H-CEUS, which first arrives at the periphery of the lesion (white short arrow). (J-M) The perfusion process of the contrast medium: the contrast medium enters from the periphery to the center, showing centripetal enhancement. (N) The peak time of H-CEUS shows non-uniform low enhancement (the long white arrow indicates the extent of the lesion)