preferred_name: Nonvisualization of the lumbosacral spine (on 11-week antenatal ultrasound)
preferred_name_lc: nonvisualization of the lumbosacral spine (on 11-week antenatal ultrasound)
label: Nonvisualization of the lumbosacral spine (on 11-week antenatal ultrasound)
label_lc: nonvisualization of the lumbosacral spine (on 11-week antenatal ultrasound)