CTICasesCrisscross Pulmonary Arteries in Repaired Tetralogy of Fallot
Imaging findings
Contrast-enhanced chest CT in a patient with a right aortic arch and repaired Tetralogy of Fallot demonstrates a rare "crisscross" pulmonary artery arrangement, where the left pulmonary artery originates from the right side of the main pulmonary artery trunk, and the right pulmonary artery originates from the left. Additionally, a large anomalous branch of the left pulmonary artery crosses the mediastinum in front of the bronchus to supply the contralateral lung.
Key takeaways
Crisscross pulmonary arteries are a rare congenital vascular anomaly, often associated with other congenital heart diseases such as Tetralogy of Fallot, ventricular septal defects, and abnormal situs. The anomaly is characterized by the spatial crossing of the branch pulmonary arteries as they course toward their respective lungs.
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