[A woman with an abnormality in the lung].

A 54-year-old woman was referred to the radiology department for an X-ray of her shoulder because of shoulder ache. Coincidentally, the X-ray showed an abnormality in the right lung. The abnormality was confirmed on chest X-ray, and a CT-scan showed a branching tubular structure with distal air trapping. This finding is pathognomonic for congenital bronchial atresia, a rare congenital abnormality. Usually this is a coincidental finding, because it is not associated with any clinical symptoms or signs. Treatment or follow-up is not necessary.