I've just looked at the Cancer Research UK site to check latest updates on Staging and it still states this for stage 4:
Stage 4 ovarian cancer means the cancer has spread to other body organs some distance from the ovaries, such as the liver or lungs. Stage 4 cancer can be
Stage 4a - the cancer has caused a build up of fluid in the lining of the lungs (called the pleura). This is called a pleural effusion.
Stage 4b - the cancer has spread to the inside of the liver or spleen, to the lymph nodes in the groin or outside the abdomen and/or to other organs such as the lungs.
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