<prompt> which ultrasound finding has highest association with aneuploidyChoroid plexus cystNuchal translucencyCystic hygromaSingle umbilical artery  <response>: All the above mentioned are ultrasound findings associated with increased risk of aneuploidy although the highest association is seen with cystic hygromaNuchal translucency and cystic hygroma are both measured in first trimesterTrisomy 21 is the most common aneuploidy associated with increased NT and cystic hygroma While monosomy X presents as second trimester hygroma. 