Figure 21.

Contrast-enhanced ultrasonography of pulmonary metastasis. A: Baseline scan shows a small hypoechoic lesion (left side of the split-screen). Ten seconds after iv bolus of contrast agent, the lesion appears unenhanced with respect to the early enhancement of the pulmonary parenchyma (arrows) (right side of the split-screen); B: Fifty seconds later, the lesion shows inhomogeneous enhancement with reduced contrast agent extent (arrowhead) with respect to the pulmonary parenchyma (right side of the split-screen).