Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interstitial markings are more prominent when compared with prior studies of ___ and ___ , suggesting progressive chronic pulmonary disease . Chest CT is recommended for further characterization . There is no focal consolidation , pleural effusion , pneumothorax , or pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Prominent interstitial markings suggesting chronic pulmonary disease for which a chest CT is recommended for further characterization .