Neck rule 3 :Parathyroid adenoma

A pitfall in Tc-99m sestamibi scintigraphy is that thyroid lesions may concentrate sestamibi similarly to parathyroid adenomas. Transverse ultrasound image reveals a well-demarcated mass in the thyroid (curved white arrows) that at surgery was found to be a thyroid adenoma, as well as a rounded mass hypo echoic to and posterior to the thyroid that was a parathyroid adenoma (straight arrows). J, jugular vein; C, carotid artery