Fig. 4
Box-and-whisker plots of elasticity index (EI) measurements on shear wave elstography (SWE) for group 1 and group 2. a EMean. b EMax. c ESD. d high EI area on SWE. Group1, conventional type of papillary thyroid carcinoma (n = 24); Group 2, non-conventional papillary thyroid carcinoma (n = 5) including follicular variant of papillary thyroid carcinoma (n = 2), follicular thyroid carcinoma (n = 2), and medullary thyroid carcinoma (n = 1); EMean, mean elasticity; EMax, maximum elasticity; ESD, one standard deviation of elastographic values; kPa, kilo-Pascal