Figure 1.

Renal vascularity with CEUS. (a) A few seconds after injection of the contrast medium, the microbubbles arrive in the arterial branches of the pedicle and in the branches of the interlobar artery (arrowhead). (b) After 15 s the cortical phase begins (arrowhead) without involving the medulla (asterisk). (c) After the completion of the cortical phase (arrowhead) comes the onset of the parenchymal phase (25 s–4 min) with progressive appearance of the enhancement of the external medulla (asterisk) and (d) subsequent involvement of the pyramids.