PARAOVARIAN OR EPOÖPHORON CYST
Mesonephric cysts can develop from the permanent portion of the mesonephron, which is the paraovarian or epoöphoron, or from the inconstant residue of the wolfﬁan (Gartner) duct. The former, called paraovarian or epoöphoron cysts, may be small and may represent simple retention cysts; some, however, are true blastomas, which grow continuously and may ﬁnally attain an enormous size. As a rule, even the giant cysts remain unilocular.
Owing to the intraligamentary location of the epoöphoron, the paraovarian cysts are always intraligamentary and are covered by the distended peritoneum of the broad ligament. Exceptionally, the cyst is ﬁxed to its surroundings by dense inﬂammatory adhesions or, instead of expanding upward toward the peritoneal cavity, it may grow downward toward the pelvic ﬂoor or into the mesosigmoid.