Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left base opacity is seen with obscuration of left hemidiaphragm , slightly increased as compared to the prior study . Differential diagnosis includes atelectasis , aspiration , and pneumonia . Mild right base opacity also seen which could relate to the above as well . No large pleural effusion is seen . There is mild to moderate pulmonary vascular congestion . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Slight increase in bibasilar opacities could be due to aspiration or pneumonia or even atelectasis . Mild to moderate pulmonary vascular congestion . Increase in interstitial opacities bilaterally most likely due to vascular congestion , but atypical infection not excluded in the appropriate clinical setting .