Acoustic Radiation Force Impulse Imaging: A New Tool for the Diagnosis of Papillary Thyroid Microcarcinoma
Images in a 54-year-old man with nodular goiter. (a) Conventional US shows marked hypoechogenicity, irregular shape, marked shadow, and ill-defined margin. (b) The color flow Doppler shows absent blood flow. (c) Score 2 is assigned at VTI. (d) The SWV of the nodule is “2.37” m/s. The conventional US features indicate probably malignant lesion; however, the ARFI characteristics show it probably benign. (e) Histology of the lesion confirms the diagnosis of nodular goiter. Hematoxylin and eosin stain, ×100.