"Tc-99m pertechnetate is taken up by thyroid only (pertechnetate mimics iodine molecule for the Na+/I- transporter)"
"Most commonly (~80% 8), there are two pairs of parathyroid glands, inferior and superior, although there can be up to twelve in number. The parathyroid gland is oval or bean-shaped. It typically measures 5-6 x 4 x 1-2 mm and weighs 40-60 mg 1,2,10."
"Lymphatic vessels drain into the pretracheal, prelaryngeal and jugulodigastric lymph nodes ref."