<prompt> The finding of a single umbilical aery on ultrasound is :InsignificantOccurs in 10 of newbornsAn Indicator of considerably increased incidence of major malformations in the fetusEqually common in newborn of diabetic and nondiabetic mothers  <response>: The presence of a single umbilical aery may be associated with congenital malformations.Reference: Textbook of obstetrics, Sheila Balakrishnan, 2nd edition, page no:63 