We report about one case of twin pregnancy where one fetus is healthy and the other has Trisomie 21. The one large skin fold on the neck is observe in the ultrasound. This ultrasound finds is noticed in the Ullrich-Turner-Syndrome as well as in the Down Syndrome. The Trisomie 21 was ascertained after the birth. The clinical meaning of this sonographic criterium will be discussed in this paper.
Adult Diseases in Twins