Incise the skin 2 finger widths (2-3 cm) superior to the suprasternal notch between the bellies of the left and right sternocleidomastoid muscles (so-called Kocher or collar incision). Divide the platysma with electrocautery.
Note: In single parathyroid adenomas with well-known location the skin incision may be much smaller than, e.g., in thyroidectomy.