Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for low lung volumes , cardiomediastinal contours are within normal limits without change . Low lung volumes accentuate the bronchovascular structures . Allowing for this factor , there are no focal areas of consolidation , and lungs are clear except for linear scar at the left base which is unchanged from the prior radiograph . There are no pleural effusions or acute skeletal findings .
    OUTPUT:
    
Low lung volumes . No radiographic evidence of pneumonia . However , if symptoms persist , repeat radiograph with improved inspiratory level may be considered to exclude a subtle pneumonia .