CTICasesd-Transposition of the Great Arteries with Pulmonic Stenosis
Imaging findings
CT angiography in a patient with d-transposition of the great arteries (d-TGA) status post-atrial switch (Mustard or Senning) and surgical pulmonic stenosis repair shows the aorta arising from the right ventricle anteriorly, severe native pulmonic valve stenosis, and asymmetric pulmonary arterial blood flow (90% to the right lung, 10% to the left lung).
Key takeaways
In d-TGA, the aorta arises from the right ventricle and the pulmonary artery from the left ventricle. Corrective surgery and anatomical variations alter the spatial relationship of the great vessels, creating asymmetric flow patterns. Pulmonic stenosis further directs flow preferentially to the right lung due to vascular path alignment, requiring careful planning for repeat intervention.
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