Which imaging sign is related to Total Anomalous Pulmonary Venous Connection?

The snowman sign is associated with Total Anomalous Pulmonary Venous Connection (TAPVC) and is a key indicator observed in imaging studies, particularly in echocardiography or chest X-rays. TAPVC is a congenital heart defect where the pulmonary veins do not connect normally to the left atrium; instead, they connect to other venous structures. This condition results in a distinct cardiac silhouette that can resemble a snowman on imaging.

In the case of TAPVC, particularly the supracardiac type, there is an unusual configuration of the heart and surrounding vasculature, causing the heart to appear wider at the top (the "head") and narrower at the bottom (the "waist"), resembling the shape of a snowman. Recognizing this sign is crucial for pediatricians and radiologists, as it helps in diagnosing this potentially life-threatening condition promptly, leading to timely management and intervention.

While the other signs listed are related to different conditions, the snowman sign specifically identifies the characteristic appearance associated with TAPVC, making it the correct choice in this context.