Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Because the lung volumes are low , it is indeterminate if the left perihilar subtle opacity is real or artifactual . There is no pneumothorax or pleural effusion . Mediastinal and cardiac contours are normal .
    OUTPUT:
    
Because of low lung volumes , it is indeterminate if left perihilar subtle infiltration is real or artifactual . Repeat PA and lateral chest x-ray with good inspiration is suggested . This has been discussed with ___ .