Acoustic Radiation Force Impulse Imaging: A New Tool for the Diagnosis of Papillary Thyroid Microcarcinoma
Images in a 39-year-old woman with papillary thyroid microcarcinoma. (a) Conventional US shows marked hypoechogenicity, a taller-than-wide shape, and well-defined margin. (b) The color flow Doppler shows perinodular blood flow. (c) Score 5 is assigned at VTI. (d) The SWV of the nodule is “4.18” m/s. The conventional US features indicate suspicious diagnosis; however, the ARFI characteristics help make a malignant diagnosis. (e) Histology of the lesion confirms the diagnosis of papillary thyroid carcinoma. Hematoxylin and eosin stain, ×400.