CTICasesAnomalous Systemic Arterial Supply to Normal Lung
Imaging findings
CT angiography shows a large anomalous systemic artery arising directly from the descending thoracic aorta supplying the basal segments of the left lower lobe, with normal bronchial anatomy and no sequestration mass.
Key takeaways
Anomalous systemic arterial supply to normal lung is an embryologic remnant where a segment of normal lung is supplied by the systemic circulation instead of the pulmonary artery. Unlike sequestration, there is no associated bronchial malformation. It can cause hemoptysis and left-to-left shunting, requiring embolization.
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