Fig. 4
A 53-year-old man with thyroid follicular carcinoma in the right thyroid lobe. a Axial T1-weighted image showing a heterogeneous isointense lesion (white arrow) in the right thyroid lobe. b Axial T2-weighted image showing a heterogeneous hyperintense lesion with regular shape and clear margin (white arrow) in the right thyroid lobe. c Axial DWI image showing a markedly hyperintense nodule (white arrow) with ADC value of 0.998 × 10− 3 mm2/s. d Axial contrast-enhanced image showing a markedly enhanced lesion with regular shape and clear margin (white arrow) in the right thyroid lobe during early phase. e Axial contrast-enhanced image shows a wash-out enhanced lesion with regular shape and clear margin (white arrow) in the right thyroid lobe during delayed phase. f Histopathological hematoxylin and eosin (H&E, × 40) staining showing abundant follicular hyperplasia (white arrow) and tumor cell invasion in the peripheral stroma (black arrow)