Meigs' syndrome includes an ovarian tumor, usually fibroma, associated
with hydrothorax and ascites. It is accepted that uterine tumors, lik
e fibromas, can also be associated with ascites and hydrothorax, but t
his is extremely rare. The mechanism of formation of peritoneal and pl
eural effusion is not well documented. The most likely pathogenesis as
cribes the fluid formation to the filtration of interstitial fluid in
the peritoneal through the tumor capsule, and the diffusion to the ple
ural space through the diaphgram lymphatic vessels at the foramen of B
ochdalek. Paraovarian fibromas are also extremely rare neoplasms, prob
ably of paramesonephric origin. It has been hypothesised that they can
develop by proliferation of connective tissue cells around the Wolfia
n remnants. In this article, probably for the first time, a case of pa
raovarian fibroma with ascites and hydrothorax is presented.