[Loose peritoneal cysts – unexpected finding at laparoscopic surgery for suspected extrauterine pregnancy, a case report].

Loose peritoneal cysts - unexpected finding at laparoscopic surgery for suspected extrauterine pregnancy, a case report A 29 year old woman was admitted to inpatient care in the 7th week of pregnancy due to three previous episodes of abdominal pain. At admission a suspected pseudogestational sac and 2 × 3 centimetres of fluid in the cul-de-sac was noted at vaginal ultrasound examination. After two days she again developed pain and a laparoscopy was performed due to suspected extrauterine pregnancy. Instead, three clusters of thin-walled, clear cysts was found lying loose in the cul-de-sac. There were also signs of endometriosis. The abdominal pain resolved gradually. At follow-up after one week a missed abortion was diagnosed. The pathologic-anatomic diagnosis was benign peritoneal cysts. Loose cysts are a more rare form of peritoneal inclusion cysts. They are benign but the risk of reoccurrence is about 50%. Some previous case reports indicate that growth of peritoneal cysts can be stimulated by pregnancy. In this case it is however unlikely that the small, loose cysts caused the woman's pain.