Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are probably slightly lower even when accounting for differences in technique . Bilateral increased interstitial markings may reflect edema ; however , infectious etiology can not be completely excluded in the appropriate clinical situation . Increased opacity in the left infrahilar region and could reflect aspiration in the appropriate clinical situation . No large pleural effusion or pneumothorax . Cardiomediastinal silhouette is overall unchanged .
    OUTPUT:
    
1 . Mild - to - moderate edema . 2 . Increased left infrahilar opacity could reflect aspiration . Close attention on follow - up as clinically indicated .