Thank you for your responses. My sister is afraid of hospital/surgery and refuses to talk about it. Eight months ago, she visited a doctor and received the report of its size (but it has already doubled). She truly looks nine-months pregnant. She will not share the information of the doctor's visit with me since she knows that I will insist on action. I am trying to respect her wish to live with it but was wondering if there was anything written about the danger of doing nothing that I could send her. Part of her fear is that it may be cancerous that only biopsy will tell. She doesn't want to put chemicals in her body; she would rather ignore the problem. As a home body, obviously, her reaction is a little over the top. Because of her strong resistance to even discuss the problem, I feel extremely helpless. However, she is an intelligent person and information may help.
Your sister needs to be check by a doctor and if surgery is necessary, then she needs to do it. They can give her something to help her get through surgery and she will not be so scared or anxious. For her to swell up that much means something is wrong. It could be a benign cyst, most are, but she shouldn't have to be so miserable. Please encourage her to see a doctor. Good luck!
You need to find out what size and what type of cyst it is. The swelling is because the cyst is pushing on her internal organs. She could end up with a bowel or ureter blockage among other things. Cysts like that can burst or twist and that is a medical emergency as an infection can easily happen. A planned surgery is much safer than an emergency surgery. She also needs the surgery to ensure that it isn't Ovarian Cancer. The odds are it isn't as over 95% of all cysts are benign but she cannot risk waiting just in case it is. Many of us have had the surgery and are happier and healthier than we were for some time. Please keep us posted over on the ovarian cyst forum.