Fig. 21From: Neoplastic pathology at the crossroads between neck imaging and cardiothoracic imagingThyroid adenoma. a Grayscale ultrasound image shows an oval nodule with heterogeneous internal echoes and cystic components without internal flow (arrow). b Iodine 123 thyroid scan shows persistent increased radiotracer uptake within the nodule on the 24-h delayed images (arrow), findings consistent with an hyperactive thyroid adenoma (hot nodule)Back to article page