Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single supine radiograph of the chest demonstrates the lungs are well expanded . There is no pneumothorax . Blunting of the left costophrenic angle likely represents a residual small pleural effusion , with interval improvement in left basilar atelectasis . The cardiomediastinal silhouette is stable , with calcifications noted in the aortic knob . Catheter tubing is present over the left upper quadrant , unchanged since the prior study . Coarse interstitial markings are again noted , with no evidence of overt pulmonary edema or focal airspace opacity .
    OUTPUT:
    
Left pleural effusion is smaller compared to the prior study , and left basilar atelectasis has improved . No evidence of pneumonia .