Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to prior , there are increased interstitial markings and vascular engorgement . Subtle increased opacity in the left retrocardiac space could be reflect presence of pneumonia . There is no large pleural effusion . There is no pneumothorax . Cardiomediastinal silhouette is unchanged with top - normal heart size . Bony structures appear grossly intact .
    OUTPUT:
    
1 . Mild pulmonary edema . 2 . Subtle opacity in the left lower lobe could represent pneumonia .