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(a) H&E stained section shows a solid growth pattern interspersed with areas of cystic change (arrows). The cystic spaces are filled with a watery “proteinaceous” fluid as well as red blood cells. (b) A bright, eosinophilic material fills the “follicle-like” spaces (arrows) with peripheral scalloping reminiscent of the colloid-filled follicles seen in thyroid tissue
