Prediction of Extrathyroidal Extension Using Ultrasonography and Computed Tomography

Figure 1

Grouping of thyroid tumor according to ultrasonographic findings. (a) Group 1: the tumor is completely enveloped by thyroid parenchyma, (b) Group 2: the tumor is attached to the thyroid capsule without definite destruction of the capsule, (c) Group 3: the tumor destroys the thyroid capsule and the capsule shadow is disconnected.

(a)

(b)

(c)