Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest demonstrate post-operative changes related to left upper lobe resection , which are similar in appearance to the prior study . Slight interval improvement in the previously described linear opacity at the right lung base , likely atelectasis . Small left - sided pleural effusion versus pleural thickening , unchanged from the prior study . Cardiomediastinal and hilar contours are unchanged . There is no pneumothorax or consolidation . A tube projects over the left upper quadrant and lower left hemithorax , which is likely external to the patient .
    OUTPUT:
    
1 . Interval decrease in linear atelectasis at the right lung base . 2 . Stable left - sided pleural effusion versus pleural thickening .