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(a) B-mode; and (b) colour Doppler overlay images of a cystic thyroid nodule with solid isoechoic mural component, for which demonstration of internal vascularity allowed confident BTA classification as U3. The echogenic foci are non-specific for either colloid or fine calcification. This nodule was confirmed as papillary carcinoma at surgery, highlighting the value of Doppler vascularity in detecting malignancy.
