Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . Given differences in technique compared to most recent CT scan , there has been no definite change . Increased interstitial markings seen throughout the lungs particularly at the bases left greater than right has not definitely changed . Low lung volumes are again seen . The cardiomediastinal silhouette is unchanged . No acute osseous abnormalities detected .
    OUTPUT:
    
No definite acute cardiopulmonary process noting that subtle change could easily be obscured given background of changes compatible with known pulmonary fibrosis .