Fig. 1
From: Comparison of computed tomography features between follicular neoplasm and nodular hyperplasia
A 51-year-old woman with follicular adenoma in the left thyroid lobe (largest diameter, 1.9 cm). In non-enhanced (a) and contrast-enhanced (b) axial CT images, follicular adenoma (arrows) in the left thyroid lobe shows homogeneous low attenuation, mildly expansile configuration, taller-than-wide shape, inhomogeneous and increased enhancement, and presence of the CT halo sign (arrowheads)