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US images show background echotexture of the gland. (a) Sagittal gray-scale image of the left lobe of the thyroid in an 18-year-old girl with normal background echotexture and two benign thyroid nodules. Calipers outline the thyroid gland. (b) Sagittal gray-scale image of the left lobe of the thyroid in an 18-year-old girl with abnormal background echotexture (arrowheads) consistent with Hashimoto thyroiditis.
