Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is increased interstitial markings bilaterally which may represent mild interstitial edema . More focally there is an opacity which obscuring the left costophrenic angle . There is mild cardiomegaly . There is no pneumothorax .
    OUTPUT:
    
1 . Blunting of the left costophrenic angle likely representing a combination of pleural fluid and atelectasis . In the correct clinical setting a superimposed infection is difficult to exclude . 2 . Mild interstitial edema .