Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Slightly rotated positioning . This may account for slight leftward positioning of the cardiac silhouette . The cardiomediastinal silhouette , including its positioning , is unchanged . There is probable background hyperinflation . Again seen is a junction line traversing the midline , unchanged . There is minimal patchy opacity at both lung bases on the frontal view and a band of opacity projecting over the lung on the lateral view . No frank consolidation or effusion is seen . No pneumothorax is detected . Limited assessment of the osseous structures demonstrates an old healed lateral nondisplaced ninth rib fracture .
    OUTPUT:
    
1 . Hyperinflated lungs consistent with COPD . 2 . Bibasilar atelectasis . No definite pneumonic infiltrate . 2 . Linear band projecting over the cardiac silhouette on the lateral view . The appearance is suggestive of recurrent collapse involving the lingula . The etiology for this remains unclear .