The ‘Y sign’ as a novel qualitative marker for prenatal detection of aortic coarctation: a retrospective cohort study

The absence of the "Y sign" appears to be a sensitive and reproducible marker for prenatal CoA prediction. Although its specificity is moderate, the "Y sign" offers a practical, qualitative alternative to complex angle-based measurements, and may serve as a valuable adjunct in prenatal screening protocols, particularly when integrated with other structural and biometric parameters.