Fig. 2.
White solid cystic mass (a). Tumor with cystic space (*) and plexiform to solid nests including gland-like structures (b arrowhead, follicular nest; arrows, gland-like structures; H&E × 10). Gland-like structures (arrows), epithelial whorls (arrowhead), and microcytic spaces lined by squamous metaplastic cells (*) were observed in the nest comprising satellite-like polygonal cells (c H&E × 10). Immunohistochemical staining showing diffusely positive BRAF p.V600E (d × 10). H&E, hematoxylin and eosin