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
Hyperechogenisity
Hypoechogenisity
Nonhomogenous
Microcalcification