Anyone else had this happen? Left ovary removed on 16 April, ultrasound on 31 October shows an ovary there. Apparently it is rare but can happen if a few cells are left behind (and how hard would it be to remove all cells without a microscope) but more likely for ladies with lots of adhesions. I thought maybe someone else in this community may have had the same thing. Seeing my consultant Wednesday. A bit annoyed but I guess it can't be helped.