Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs appear hyperexpanded suggestive of chronic obstructive pulmonary disease . A focal nodule is noted posterior to the sternum . Additionally , there is enlargement of the left main pulmonary artery . Cardiac silhouette is normal . Bibasilar opacities are visualized likely representative of bronchiectasis and fibrosis . Calcifications of the origin of the great vessels are noted .
    OUTPUT:
    
1 . There are bibasilar parenchymal opacities likely representative of chronic scarring . 2 . There is a small retrosternal nodule . Follow up with CT is recommended . 3 . Left pulmonary artery appears prominent suggestive of pulmonary artery hypertension or pulmonic stenosis .