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Noninvasive encapsulated papillary RAS-like thyroid tumor (NEPRAS). (A) Low-power view of an encapsulated papillary patterned thyroid without capsular or vascular invasion (H&E stain, ×40). (B) Higher magnification reveals mild nuclear enlargement and nuclear membrane irregularity which correspond to a nuclear score of 2 (H&E stain, ×400). Ohba et al. [27] proposed to name this tumor NEPRAS.
