I had this test and it was normal. However, I'm being told that the mass I have on my left ovary is almost certainly cancer. My GP said that it's possible to have a normal test, but still have cancer. Does anyone understand the test? Does it mean anything that mine was negative? I know some early stage cancers test normal, but my mass is 7.5cm. I know as well that it's less reliable in younger women, but I'm 59 and had my menopause at 52. I've searched for some information, but I'm none the wiser.