Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Pulmonary vascular congestion and interstitial edema are mild . Left basilar opacity is worse since prior . Right middle lobe opacity is worse since prior . There is likely a small left pleural effusion . There is no pneumothorax . Cardiomegaly is mild . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
1 . Worsened left basilar opacity is likely due to a combination of atelectasis and a small effusion , but superimposed infection is also a possibility . 2 . Right middle lobe opacity is worse since prior and may be due to atelectasis , aspiration , and / or pneumonia .