Fig. 2From: Value of CEUS features in diagnosing thyroid nodules with halo sign on B-mode ultrasoundA follicular adenoma in a 53-year-old woman. A Greyscale ultrasound showed that there was a halo surrounding the thyroid nodule. B Contrast-enhanced ultrasound revealed regular high-enhancing ring (at the 24th second after the injection of contrast)Back to article page