Prediction of Extrathyroidal Extension Using Ultrasonography and Computed Tomography

Figure 2

Grouping of thyroid tumor according to computed tomographic findings. (a) Group A: the tumor is completely enveloped by thyroid parenchyma, (b) Group B: the percentage of the perimeter of the tumor that contacted the thyroid capsule is less than 25%, (c) Group C: the percentage of the perimeter of the tumor that contacted the thyroid capsule is 25–50% contact, (d) Group D: the percentage of the perimeter of the tumor that contacted the thyroid capsule is more than 50%.

(a)

(b)

(c)

(d)