Image IQ: Vascular Anomaly in Fetus

This 18-week fetus has a vascular anomaly. Can you identify it?

What's your diagnosis in this 18-week fetus?

(Images courtesy of Firoz Bhuvar, MD)

1. Azygos vein
2. Aberrant right subclavian artery (ARSA)
3. Aortic aneurysm
4. Normal right common carotid artery
5. Normal left common carotid artery
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