**12. Eendometriosis may cause a Meigs-like syndrome**

In patients with extensive abdominal endometriosis, a sero-sanguinous ascites may occur and in one third of these patients a right pleural effusion may be observed. In these cases, there is also present an ovarian lesion caused by endometriosis, and the whole clinical picture is consistent with malignancy. The exact mechanism of the development of ascites and the pleural effusion is not clear, and as the most probable cause is considered the stimulation of the mesothelial layer by the endometriosis to produce ascites.
