Fig. 3.

Schematic explanation of encapsulated papillary patterned thyroid tumors. Noninvasive encapsulated papillary patterned thyroid tumors with papillary thyroid carcinoma (PTC)-like nuclear features were not defined in the fourth edition World Health Organization classification of tumors of endocrine organs [2]. Ohba et al. [27] proposed to name it noninvasive encapsulated papillary RAS-like thyroid tumor (NEPRAS). FT-UMP, follicular tumor of uncertain malignant potential; WDT-UMP, well-differentiated tumor of uncertain malignant potential; WDC-NOS, well-differentiated carcinoma not otherwise specified.