The supraisthmic anastomotic arch: a potential pitfall in Doppler sonography of the thyroid gland

C onventional B-mode sonography is commonly used in the imaging of thyroid diseases. Recently, Doppler analysis of the superior thyroid artery has shown some promise in the evaluation of thyroid function [1, 2]. We report angiographic and sonographic findings concerning an anatomic variant of the superior thyroid artery that may represent a pitfall in the Doppler analysis of thyroid vascularization.