Study observation:Find:Pt:Aorta descending^Fetus:Nar:US
study observation:find:pt:aorta descending^fetus:nar:us
Study observation:Finding:To identify measures at a point in time:Aorta descending^Fetus:Narrative:Ultrasound
study observation:finding:to identify measures at a point in time:aorta descending^fetus:narrative:ultrasound