Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right lung appears clear with no focal consolidation , pleural effusion or pneumothorax . The cardiomediastinal contours are unremarkable . The patient is status post left upper lobectomy with surgical material and clips noted in the upper lung zone . Left upper zone opacity is noted , slightly more prominent on today 's study and may represent post-radiation change versus infectious process .
    OUTPUT:
    
Left upper zone opacity is more prominent on today 's study and may represent radiation change ( correlate with clinical history ) or infectious process in the correct clinical setting .