Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Bibasilar opacities are again seen , similar to prior . Overall lung volumes are relatively low . Superiorly the lungs are clear of new consolidation . Cardiomediastinal silhouette is unchanged . No acute osseous abnormalities detected .
    OUTPUT:
    
Bibasilar opacities compatible with patient 's history of pulmonary fibrosis . No definite superimposed acute process noting that a subtle changes particularly at the bases could be obscured .