Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Minimal interstitial reticular appearance in the lower lung bases is unchanged and better characterized on prior CT . Given the obscuring appearance of interstitial disease , it is difficult to rule out left lower lobe pneumonia , but the hemidiaphragms are clear which supports a lack of pneumonia . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal . No pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Given interstitial disease , it is difficult to rule out lower lobe pneumonia but clear appearance of the hemidiaphragms support a lack of pneumonia process . Otherwise , no acute cardiopulmonary process .