Prenatal ultrasound image of hypoplastic umbilical artery

Hypoplastic umbilical artery.
(Upper panel) A three-vessel umbilical cord is identified, but one of the arteries is significantly smaller than the other.
(Middle panel) Color Doppler ultrasound demonstrated a functional artery.
(Lower panel) Longitudinal view of the cord shows two arteries, one of which is much smaller than the other.