A 30-year-old woman with no remarkable past medical history and an uneventful follow-up of a bichorial-biamniotic twin pregnancy attended the hospital day unit at term for fetal growth surveillance and heart rate monitoring. The first twin was in a breech presentation and a cesarean section was scheduled at 39 weeks. During the procedure and after the extraction of both placentas, the uterine fundus and part of the body were seen completely seeded with multitude of cyst-like structures resembling hydatids of Morgagni but with a harder consistency (Figure 1). A sample of the cysts fluid and a couple of entire cysts were sent for anatomopathological study.