“…Thirteen studies reported data for “any hysterectomy” not considering the concomitant oophorectomy [ 20 , 22 , [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] , [34] , [35] ] while eight studies reported data for hysterectomy without oophorectomy [ [21] , [22] , [23] , [24] , 26 , 31 , 33 , 34 ]. Ten studies reported the thyroid cancer risk in association with both hysterectomy and bilateral salpingo-oophorectomy (BSO) [ 21 , 22 , 24 , [26] , [27] , [28] , [31] , [32] , [33] , [34] ] while four studies reported the thyroid cancer risk in association with both hysterectomy and unilateral salpingo-ophorectomy (USO) [ 21 , 31 , 32 , 34 ]. Seven out of 16 articles included in the systematic review reported the estimation of thyroid cancer risk as a function of age at surgery.…”