Fig. 2

Histopathological features of thyroid intravascular large B-cell lymphoma. a Tumor cells are located in the interstitial of thyroid follicular without forming a clear boundary line (original magnification ×100). b, c Capillaries in the lesion area are filled by large atypical cells exhibiting an expansion appearance (original magnification ×200 and ×400 respectively). d Large-sized tumor cells with minimal cytoplasm, a thick nuclear membrane, irregular nuclear contours, prominent nucleoli and coarse to somewhat dispersed chromatin are noted (original magnification ×400)