Trisomy 13 at 11 weeks Boujemaa Oueslati , MD Article Published: May 24, 2002 Ben Ammar Kais, Tunis This fetus was first scanned at 11 weeks and 4 days.Ā A large nuchal lucency is identified as well as alobar holoprosencephaly, hypotelorism with fused orbits a proboscis and relative tachycardia (see the textbook of Rosalyn Snijder and Kypros Nicolaides for a graph of cardiac frequencies and chromosomal anomalies). The large nuchal lucency (5 mm). The alobar holoprosencephaly Fused orbits ProboscisĀ (pictures 1 & 2 ) and "flat" profile (picture 3 below) Relative tachycardia at 200bpm (max = 180bpm) The fetus after delivery Cyclopia and proboscis Discussion Board Start a discussion about this article Add bookmark Bookmarked