Fig. 6

Colour doppler ultrasonography of the parathyroid gland and thyroid gland. a, b Colour Doppler ultrasound examination of the parathyroid gland showing that the left dorsal thyroid is hypoechogenic, with a size of 17 × 12 mm, an unclear boundary, and irregular shape. This was diagnosed as a parathyroid adenoma. c, d Solid yellow nodules with clear boundaries are observed at the left dorsal lobe of the thyroid gland