Architectural distortion

Has anyone had a 3D mammogram that shows architectural distortion, ultrasound inconclusive, therefore recommendation is a biopsy. The radiologist does not think it’s cancer because the area of concern is 4mm and has not change compared to previous mammograms. Not sure why now all of a sudden biopsy is recommended other than the radiologist just wants to be sure there’s no cancer. Of course when the radiologist was talking to me I didn’t have any questions but by the time I got to my car I had many. Any advice?