CXR AP (above) shows an abnormal and prominent contour to the left superior mediastinum. The right superior mediastinum contour represents the thymus. Coronal CT with contrast of the chest (below) shows aneurysmal dilation of the main pulmonary artery. … Read on blog or Reader Pediatric Imaging Read on blog or Reader Newborn with abnormal prenatal cardiac ultrasound Pediatric Imaging May 2 CXR AP (above) shows an abnormal and prominent contour to the left superior mediastinum. The right superior mediastinum contour represents the thymus. Coronal CT with contrast of the chest (below) shows aneurysmal dilation of the main pulmonary artery. The pulmonary valve was absent. The diagnosis was main pulmonary arterial aneurysm due to absent pulmonary valve syndrome.

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