Figure 1. Thyroid images. (A) Diffuse enlargement of the thyroid gland with hypoechoic areas and heterogeneous inner echogenicity, internal linear echogenic strands, and posterior echo enhancement; this finding is suspicious for malignant lymphoma (green arrow). (B) In the left lobe, a mass suspected of being malignant (suspect of the papillary carcinoma: yellow arrows) and measuring 17×15 mm with calcification, partially indistinct borders, and an irregular hypoechoic area can be observed. (C) Computed tomography of the neck shows a diffusely enlarged thyroid gland (yellow arrow) compressing the trachea (green arrow). (D) Positron emission tomography with 18F-fluorodeoxyglucose shows strong 18F-fluorodeoxyglucose uptake throughout the thyroid gland (green arrow), suggesting a positive signal caused by Hashimoto’s thyroiditis or malignant lymphoma.