[A case of systemic arterial supply to the normal left basal segments with no symptoms].

A 41-year-old man was admitted to Hirakata City Hospital because of an abnormal shadow on chest X-ray film. Chest X-ray film showed a tumorous shadow in the left anterior basal segment (S8). MRI showed aberrant arteries arose from the descending aorta clearly. Broncho-fibers-copy showed no defect of visible bronchi. Aortography showed one aberrant arteries arose from the descending thoracic aorta, circulated in the basal segment of the left lower lobe, and returned to the left pulmonary vein. Pulmonary arteriogram revealed defect of A8-10. Resection of left lower lobe was performed. In the resected specimen, the bronchi of the left lower lobe had a normal structure and showed a normal pattern of distribution.