Differentiated thyroid carcinoma associated with histological features of Hashimoto's thyroiditis.

Fig. 1: Right-sided thyroid nodule. Clinically, the nodule arose from the right lobe of the thyroid gland, approximately 5 cm at its largest diameter, extending across the midline inferiorly. It was smooth and firm with no apparent retrosternal extension. There was no palpable cervical lymphadenopathy. Fig. 2: Ultrasonographic features of nodule in the right lobe of the thyroid gland. The thyroid nodule measured 5.5 cm (craniocaudal) χ 3.8 cm (transverse) χ 2.1 cm (AP). It occupied the majority of the right lobe, apart from a small area of thyroid tissue in the superior aspect of the lobe. Peripheral and central vascularity was prominent. It had relatively homogeneous echotexture, apart from two prominent internal foci. The first region located in the inferolateral aspect of the right lobe was anechoic, measuring 2.6 cm (craniocaudal) χ 1.2 cm (transverse) χ 0.8 cm (AP), without internal vascularity. The second region in the inferomedial aspect of the right lobe was hypoechoic with respect to the surrounding thyroid nodule, measuring 1.0 cm (craniocaudal) χ 1.5 cm (transverse) χ 0.9 cm (AP), with minimal vascularity.