CTICasesAtrial Septal Defect (ASD)
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Imaging findings
Imaging findings show distended pulmonary arteries and superior pulmonary veins, particularly prominent in the upper lobes. There is a balanced distribution of pulmonary blood flow, meaning vessels are distended in all lung regions. Crucially, the SVC and azygos vein are not widened, suggesting that the expanded circulating blood volume is not the cause of distention.
Key takeaways
A balanced distribution of pulmonary blood flow with distended pulmonary arteries and veins, in the absence of SVC and azygos vein widening, is highly suggestive of a left-to-right shunt. Atrial Septal Defect (ASD) is the most common cause of this phenomenon in the chest, making it an important radiographic finding for residents to recognize.
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