The Value of Peripheral Enhancement Pattern for Diagnosing Thyroid Cancer Using Contrast-Enhanced Ultrasound

Figure 2

Peripheral regular no-enhancement ring of thyroid nodule on CEUS. (a) Gray-scale US showed two adjacent iso-echoic nodules with defined hypoechoic haloes and regular shapes in the left lower lobe of the thyroid (arrows). (b) During CEUS, an iso-enhancement pattern was found in both two nodules; meanwhile, regular no-enhancement rings (arrowhead) were displayed around the nodules. Both of the nodules were thyroid adenoma confirmed by surgical pathology results.

(a)

(b)