Kim H, et al. - In this study, 321 candidates were assessed to predict if follicular thyroid carcinoma was related to distant metastasis and also to determine the preoperative ultrasound (US) findings. They noted distant metastasis was independently predicted by age, marked hypoechogenicity, nodule-in-nodule appearance, and rim calcification on US in the preoperative model. Marked hypoechogenicity, rim calcification, and widely invasive histology were observed as predictors postoperatively. They recorded sensitivities, specificities, and the area under the curves for predicting distant metastasis, 86.5%, 80.3%, and 0.889 on the preoperative status and 86.5%, 78.5%, and 0.908 on postoperative status.