Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Re - demonstrated is posterior spinal fusion hardware . The cardiomediastinal silhouette is within normal limits . The hila are unremarkable . There are slightly low lung volumes , with streaky opacities at the lung bases likely representing atelectasis . There is no focal lung consolidation elsewhere . There is no pulmonary vascular congestion or pulmonary edema . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary process .