Hello, Welcome to Just Answer and thanks for your question. All you "see" are masses that shouldn't be there. Whether they are malignant or not cannot be determined by any of these tests. That requires a biopsy.
They will probably do a biopsy to determine if there is anything really wrong or not. Thickening and enlargement can be from hormonal changes, fibroids, or adenomyosis (when the lining of the uterus grows into the uterine wall), for instance. It doesn't have to mean cancer. Ultrasound can usually tell the difference between fibroids and adenomyosis.
Yes, it can mean cancer, but that can only be confirmed with a biopsy.
I didn't. I said that all you can "see" are masses that would be suspicious. Of course you also see enlargements, if ovaries are present or absent, and other geographical landmarks.. However, you cannot tell from an ultrasound if any irregularity seen is cancer or not. It takes a biopsy to diagnose cancer. Your question concerned seeing cancer in an ultrasound. You can't.