Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
From the case:
Congenital pulmonary arteriovenous malformation
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Single CTA image demonstrates a cluster of dilated serpiginous vessels in the left lung base. Other images in the series demonstrated connection between the pulmonary artery and vein, consistent with a congenital pulmonary arteriovenous malformation.