Cystic hygroma and allantoic cyst in a 1st trimester fetus Juan Camilo Arjona, MD Jose Luis Duque, MD Article Published: Jul 27, 2002 Medicina Perinatal, Bogotá Colombia This is a 1st trimester fetus with both a large cystic hygroma and an allantoic cyst. Discussion Board Start a discussion about this article Add to Favorites Favorite