Fig. 4

Thyroid gland imaging findings (July 2017). a, b Ultrasonography of the thyroid gland showing rough and mildly low echogenicity in a slightly enlarged thyroid gland without a tumor (a). Color Doppler images revealed no increased blood flow in the thyroid gland (b). c Technetium-99m pertechnetate thyroid scintigraphy showing a low thyroid uptake (0.1%, reference range 0.5–4%) in the entire thyroid gland without a hot spot