Necrotic materials and foam cells seen in histopathology appeared hypo or iso dense on CTA,hypo echoic on DUS,and heterogeneous intense on MRA.

• CTA为低、等密度者 ,DUS回声低 ,MRA信号强度不均 ,斑块镜下显示无定形坏死物质及积聚脂质的泡沫细胞。