Which of the following feature of a thyroid nodule on ultrasonogram is not suggestive of malignancy?

The hyperechoic structure on ultrasonography suggests a benign lesion. Malignancies always have a hypoechoic or nonhomogeneous hypoechoic structure. USG features of malignancy in a thyroid nodule Hypoechoic / nonhomogeneous / solid                 Microcalcification                                                   Variable peripheral rim Internal vascularity Lymph node involvement