Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits with calcification of the aortic knob . There is no pneumothorax or pleural effusion . The lungs are well - expanded . The left upper lobe lesion appears smaller than on the prior studies , and the prior peripheral left upper lobe pneumonia is resolved . Mild platelike atelectasis at the left lung base is noted . The upper abdomen is unremarkable in appearance .
    OUTPUT:
    
1 . No pneumothorax . 2 . Decrease in size of left upper lobe lesion . Resolution of left upper lobe pneumonia .