A "collar" marke was placed at the level of the clavicles. In this case, the adenoma is definitely above the clavicles and sternal notch.
Large right inferior parathyroid adenoma, measuring 2 x 1.5 cm, was localized by sestamibi scan and readily visible in the neck between the right lobe of the thyroid, the trachea and the clavicle.
Right parathyroid adenoma, requiring extensive dissection and mobilization of the right thyroid lobe