Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: One portable AP upright view of the chest . There are low lung volumes . The lungs are grossly clear . There is no evidence of pneumothorax or pleural effusion . Cardiac , mediastinal , and hilar contours are normal . There are apparently old rib fractures at T7 and T8 on the right and T7 on the left .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .