I know it's been a year, but I just joined here and saw your post. I know it's a year later, but I did want to comment on one thing you mentioned. The oncologist said it was very rare that ovarian cancer to to the brain. That may be true, but it can happen, especially if your mother had enlarged lymph nodes. My brother had Stage IV bladder cancer and enlarged lymph nodes. Did chemo for little over a year. The last three CT scans he had were "clean". Then he started having balance issues and falling. Took him to ER when things got really bad. They did MRI and found tumor mass at base of brain and it was inoperable. He passed two months later. His oncologist told us, after it was found, that it was rare to spread to brain. Because of my concern, I advised my oncologist (I have Stage III-C OC) and she scheduled an MRI of neck and brain. Mine came out okay, but I still plan on asking for another one at some point, just in case. Because it's rare, they just don't regularly schedule scans of the brain - just the area where your cancer started. It seems once it's in the lymph nodes, it can go anywhere at anytime.