Hi, I'm very new to this site but it's good to know it's there. I had a transvaginal ultrasound yesterday (a routine screening) and it revealed a 34mm complex mass near my left ovary. The docs said it could be a corpus luteum after ovulation but it could also be cancer. I had the blood test today but won't get the results until Tuesday. Has anyone else had the corpus luteum misread for cancer? I am so scared, especially as I have young children. Any advice would be so welcome.