**10. Angiomyolipoma**

Typically, AMLs contain macroscopic fat and in B mode ultrasound, there are homogeneously echogenic. There are lipid-poor AMLs that correspond to isoechoic feature on B mode ultrasound. The CEUS reveals for AMLs the following vascular pattern: homogeneous, hypoenhanced compared to adjacent renal parenchyma (**Figure 9**). The contrast agent persists in delayed phases. This characteristic is very important in differential algorithm for RCC [8].

**Figure 9.** (a and b) Angiomyolipoma. CEUS (left) and gray scale ultrasonography (right). There is a tumor, round, well defined, and hypoechoic, with peripheral vascularity. The aspect suggests the presence of a neoplasia, but is not entirely typical for angiomyolipoma.
