Fig. 2

Echograms of three representative patients whose hypoechoic lesions decreased or disappeared on careful follow-up examination. a A 74-year-old woman with a nodular hypoechoic lesion at presentation (A1) that had markedly decreased in size one month later (A2) (case No. 9 in Table 2). b A 69-year-old woman with a severely hypoechoic lesion involving the both thyroid lobes (B1) that had almost disappeared 10 months later (B2), although the irregularity remained possibly due to underlying chronic thyroiditis (case No. 4 in Table 2). c A 53-year-old woman with a diffuse severely hypoechoic lesion involving the whole thyroid (C1) that had markedly decreased in size 27 months later (C2) (case No. 1 in Table 2)