Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal , and hilar contours appear unchanged . There is probably a small persistent pleural effusion on the left , but with increased superimposed opacification projecting along the posterior costophrenic angle . Fissures are thickened and there is a generalized mild prominence of the interstitium , suggesting interstitial changes , although mild vascular congestion is possible . Irregular pulmonary architecture , particularly in the upper lungs , is suggestive of emphysema . Multifocal left - sided rib deformities appear unchanged as well as scarring at the left lung apex .
    OUTPUT:
    
1 . Increased left posterior basilar opacification including persistent small pleural effusion . 2 . Mild interstitial abnormality , which may reflect emphysema and mild chronic interstitial disease , although mild superimposed vascular congestion could be considered in the appropriate setting .