CTICasesAnomalous Systemic Arterial Supply to the Right Lower Lobe
Imaging findings
Contrast-enhanced chest CT demonstrates a large systemic feeding artery arising directly from the lower descending thoracic aorta, which courses into the right lower lobe of the lung. In addition, there is anomalous pulmonary venous drainage from the right lung into the azygos vein. The minor fissure is absent, resulting in a hybrid middle and lower lobe configuration.
Key takeaways
Anomalous systemic arterial supply to normal lung tissue is a rare congenital vascular anomaly, sometimes referred to as a pseudo-sequestration. Unlike classic intralobar sequestration, the supplied lung tissue has normal bronchial connection. When combined with anomalous venous return (such as drainage to the azygos vein or IVC), it overlaps with the Scimitar syndrome spectrum.
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