Figure 1

Images in a 61-year-old woman with a 13-mm nodular goiter in the right thyroid lobe. (a) Conventional US shows the features of iso-echogenicity and well defined margin. (b) Color Doppler US shows predominately peri-nodular blood flow. (c) Histologic examination (haematoxylin-eosin staining, ×200) confirms the diagnosis of nodular goiter.