Egg-Shaped Heart

(redirected from Egg-on-a-String Sign)
A globoid cardiac shadow, seen on a plain AP chest film of young children with transposition of great vessels; the mediastium is narrowed. The egg-shaped heart is characterised by a large ventricular silhouette and a small ‘waist’, and results from an abnormal location of the aorta, directly in front of the pulmonary artery, associated by physiologic necessity with a ventricular septal defect; these defects may evolve into congestive heart failure