Fig. 8. A 61-year-old female with an anomalous pulmonary vein at the segmental level.

A, B. Coronal CT images demonstrate several tortuous vascular structures (arrowheads) in the right upper lobe. C, D. Selective angiograms at the truncus anterior show normal pulmonary arteries, but abnormal drainage of the right upper lobe apical segment (arrows) through anomalous pulmonary veins. E. In the angiogram with a catheter wedged into the segmental pulmonary artery, the anomalous pulmonary vein mimics a nidus and the early draining vein (arrowheads) of arteriovenous malformation.