[An elderly case of anomalous systemic arterial supply to the normal basal segment of the left lower lobe and summary of reports of the disease in Japan].

A 69-year-old asymptomatic woman was admitted because of an abnormal chest shadow. Chest X-ray films showed a tumorous shadow behind the heart. Chest CT scans showed an aberrant artery branching from the thoracic aorta and supplying the left basal segment, but the bronchial tree was normal.