Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The inspiratory lung volumes remain low . The bilateral costophrenic angles are visualized and no significant pleural effusion is noted on the lateral view . There is increased opacification of the left lung base , which is new from prior studies of ___ . This opacification is seen in the setting of background reticular pattern with predominance in the lung bases , although the upper lungs are also affected . The cardiomediastinal silhouette is accentuated by the low lung volumes but appears within normal limits and unchanged .
    OUTPUT:
    
1 . Left basilar pneumonia . 2 . Background pulmonary fibrosis and low lung volumes .