<human>: My mom is 53 and is obviously past menopause. She was suffering from lower abdominal pain so she went to the doctor. They eventually found a left adnexal mass and free pelvic fluid found on an ultrasound, in addition to elevated Beta-HCG levels (83). They performed a laproscopic surgery and removed her left ovary because off the mass (3-4 cm cyst with thick yellow fluid). Ectopic pregnancy was ruled out, as well as any trophoblastic tumors. Her Beta-HCG levels dropped down to 64 but she recently got it tested again (4 days after surgery) and the HCG levels rose again to 88.

I know this is a lot to ask, but I cannot find anything on Google that can ease my mind and help me figure out what could be wrong with her. The doctors have no idea either and are contemplating taking out her other ovary, even though they're not entirely sure of the cause.

If anyone could help, that would be great! :)

Can you condense the text into a few key points?
<bot>: Mom had left ovary with 3-4 cm cyst removed, has elevated Beta HCG Levels, doctors ruled out trophoblastic tumors and have no idea what's wrong with her. Help?