Table 1.
US features of thyroid nodules based on the Korea Society of Thyroid Radiology (KSThR) guidelines.
Table 2.
Distributions of US diagnoses in each bethesda category.
Fig 1.
US image of right thyroid gland of a 46-year-old male.
(a) Axial view show microlobulated isoechoic nodule with microcalcifications. (b) Sagittal view show a 1.3 cm microlobulated isoechoic nodule with microcalcifications (crosses) in the mid portion of the right thyroid gland. The US diagnosis was malignant and the FNA result was Bethesda category I (non-diagnostic). Total thyroidectomy was performed and the pathological result was papillary thyroid cancer. US was highly sensitive in identifying nodules diagnosed as Bethesda category I.
Table 3.
Final cytopathological results in each Bethesda category.
Fig 2.
US image of right thyroid gland of a 51-year-old male.
(a) Axial view show a circumscribed isoechoic nodule (crosses). (b) Sagittal view a 2.9 cm circumscribed isoechoic nodule (crosses) is visible in the lower portion of the right thyroid gland. The US diagnosis was probably benign and the FNA result was Bethesda category IV (follicular neoplasm). Follicular thyroid carcinoma was revealed by total thyroidectomy. US was not informative for this Bethesda category IV nodule.
Table 4.
Performance of ultrasonography in each Bethesda category.