Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , small left pleural effusion with left retrocardiac atelectasis is increased , and mild pulmonary edema is increased . A linear opacity in the upper to mid right lung may be atelectasis , however , pneumonia can not be excluded . Moderate cardiomegaly persists . No pneumothorax .
    OUTPUT:
    
1 . Increased small left pleural effusion with left retrocardiac atelectasis and increased mild pulmonary edema since ___ . 2 . A linear opacity in the upper to mid right lung may be atelectasis , however , pneumonia can not be excluded .