ad. 16. Single umbilical artery – what is it?
Single umbilical artery is an issue occurring when one of the two arteries running deoxygenated blood from a fetal body to a placenta had not developed or gradually disappeared. Then, one of the arteries expands compensating the absence of the other. If such an image appears in an ultrasound examination without combination with any other anomaly it is a variation of the norm occurring in ab. 1% of healthy fetuses.
At that time, it is recommended to exclude defects of the urinary system, of the fetal heart, and the presence of hard-clenched hands or umbilical hernia, which might indicate genetic syndromes.