Nonvisualization of the lumbosacral spine (on 11-week antenatal ultrasound)
nonvisualization of the lumbosacral spine (on 11-week antenatal ultrasound)
Nonvisualization of the lumbosacral spine (on 11-week antenatal ultrasound)
nonvisualization of the lumbosacral spine (on 11-week antenatal ultrasound)