Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are present . Are not size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Subsegmental atelectasis is present in the lung bases without focal consolidation . No pleural effusion or pneumothorax is detected . Previously demonstrated right upper lobe lesion is better seen on the prior chest CT . Thoracolumbar posterior fusion hardware is re - demonstrated .
    OUTPUT:
    
Low lung volumes with bibasilar subsegmental atelectasis . Known right upper lobe pulmonary lesion demonstrated on recent CT is not as well seen on the current exam .