Trisomy 18 Abossollo, MD, Fabrice Cuillier,MD Article Published: Apr 1, 2004 Hôpital Félix Guyon, Topazes street, 97400 Saint-Denis, Reunion Island, France. Ph : 0262 90 55 22. Fax : 0262 90 77 30. This is a fetus for which the firs trimester exam revealed a thickened nuchal lucency: Figure 1: Cystic hygroma Figure 2: 3D Rendering A repeat exam during th second trimester demonstrated several anomalies including: Figure 3: An atrioventricular septal defect. Figure 4: Choroid plexus cysts  Discussion Board Start a discussion about this article Add to Favorites Favorite