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A 68-year-old man with a collapsing benign cystic nodule. A, A transverse US of the thyroid gland shows a 0.6-cm-long ill-defined ovoid markedly hypoechoic nodule with suspicious microcalcification. Note a low-echoic halo and an inner isoechoic rim (arrowheads) surrounding the nodule. B, A transverse US performed 1 year ago reveals a 1.7-cm-long predominantly cystic nodule with an isoechoic solid component at the same location.
