There is dense opacification of the left hemithorax, with elevation of the hemidiaphragm consistent with loss of volume. On the lateral projection there is anterosuperior opacity, suggesting collapse of the upper lobe. In addition there is the impression of increased soft tissue at the left hilum, however this is not well assessed. The right lung is clear. No osseous lesion is identified. The concern is for an obstructing left hilar lesion, specifically bronchial carcinoma. Further investigation with CT is recommended.