Preferred Label : flat waist sign;
Definition : Left heart border is flat rather than concave on a frontal radiograph. Suggests left
lower lobe collapse, causing right anterior oblique rotation.;
Source : Eisenberg, Ronald L. Atlas of Signs in Radiology.;
Origin ID : RID35219;
Associated condition(s)
Left heart border is flat rather than concave on a frontal radiograph. Suggests left
lower lobe collapse, causing right anterior oblique rotation.