If they were concerned it was cancerous they would probably give you a blood test to check tumor markers. I had an immature teratoma 3 years ago and was diagnosed through these. I still have my blood tested every 3 months to check these, they include CA 125 (many other postings talk about this one), AFP, and B-HCG. I am not sure exactly which one identifys what but maybe ask your doctor if these tests have been done. Hope this helps you a bit.