I'm postmenopausal and have been on tamoxifen for DCIS for 3 yrs.. I went for an ulrasound for a kidney stone follow up and they found the thickening. I had a transvaginal US and it showed thickening to be 3.6 cm, but with no sypmtoms whatever. My Dr. told me to stop the tamoxifen until after my endo. biopsy. I've never had any gyn problems in the past. Should I be really worried?