Cystic hygroma Ghada Mahmoud Mansour, MD Article Published: Jun 15, 2002 Cairo, Egypt This 3rd trimester fetus has a large cystic hygroma. The multicystic structure around the head The site of origin of the cyst in the neck. Doppler signal for the cyst (low vascularity). Another view for the cystic hygroma The hydrothorax is compressing the lungs causing pulmonary hypoplasia, (lower arrow), ascites, and dense lymphedema (upper arrow). Note the severe oligohydramnios. Another view for hydrothorax and ascites. Placentomegaly  Discussion Board Start a discussion about this article Add to Favorites Favorite