I don't think ascites/pleural effusion occurs commonly. Meigs syndrome (assuming this is what you're referring to) is rare and not the rule. Ascites could also be due to ovarian mets causing peritoneal carcinomatosis, but that's probably pretty rare too.
Yea if you see right sided pleural effusion with uterine deposits, think of Meigs. But if a woman has a mucinus cystadenocarcinoma of the ovary, the cysts can rupture and lead to mucous build up in the peritoneum. That's also called: