Anomalous systemic arterial supply to the basal segments of the lung.

We report on a 58-year-old man with an anomalous systemic artery to the basal segments of the left lung. The anomalous systemic artery originated from the descending thoracic aorta, distributed to the basal segments of the left lower lobe, and drained into the normal left inferior pulmonary vein. The pulmonary artery to the basal segments was not recognized. His bronchoscopic findings were normal. He underwent left lower lobectomy with division of the aberrant artery. The patient has remained well without any complications since surgery.