A patient was admitted to the hospital with complaints of occasional pains at the bottom of abdomen that get worse during menses, weakness, indisposition, nervousness, some dark bloody discharges from vagina on the day before and the day after menses. Bimanual examination results: body of womb is enlarged, appendages cannot be determined, posterior fornix has tuberous surface. Laparoscopy results: ovaries, peritoneum of rectouterine pouches and pararectal fat are covered with "cyanotic spots". What is the most probable diagnosis?