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Can you attach the photos here?
In the image 5, there are two masses (fibroids?) just behind the uterus, which may press the rectum. Usually fibroids shrink after menopause. It might be ovarian tumors.
You should have CA125 in the blood checked which is an ovarian tumor marker. The tissue looks like the muscle layer of the uterus. They could be fibroids. Since they press the rectum, you should have a hysterectomy considering your age. If only they are removed, they would bleed a lot and you may need blood transfusion.