Ultrasonogram of thyroid gland and parathyroid glands. (a) Ultrasonogram and (b) color Doppler flow of right thyroid lobe showed a 2.8 × 1.9 cm heterogenous hypo-to-isoechoic with central hypervascularity solid mass located just inferior to right lobe of thyroid gland. The presence of extrathyroidal feeding artery or polar artery was shown (arrow). This mass was corresponding to palpable neck mass.
