Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to previous exam from ___ and CT chest from ___ . Again seen are diffuse bilateral ill - defined opacities throughout the lungs , which appear more conspicuous at the bases . There is no new large dense consolidation , nor effusion . The lung volumes appear appropriate . Cardiomediastinal silhouette is unchanged as are the osseous and soft tissue structures .
    OUTPUT:
    
Diffusely increased interstitial markings in the lungs bilaterally similar to prior exam , compatible with patient 's known chronic underlying lung disease . Please note that new subtle regions of consolidation or interstial edema would be difficult to exclude given diffuse background parenchymal changes .