CTICasesSystemic-to-Pulmonary Arterial Shunt
Imaging findings
Reduced opacification of a pulmonary artery segment on CT angiography, mimicking pulmonary embolism. Closer inspection reveals intercostal arteries supplying a vascular "tangle" that shunts blood into the pulmonary artery.
Key takeaways
These shunts are often mistaken for PE or AVMs; they are likely acquired (possibly post-infectious like TB) rather than congenital, and diagnosis is confirmed by identifying the systemic feeder vessel (e.g., intercostal or bronchial).
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