Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a left chest tunneled hemodialysis / pheresis catheter . Multiple median sternotomy wires are re- demonstrated . The cardiomediastinal silhouettes are stable and within normal limits . The bilateral hila are unremarkable . There are low lung volumes . Linear opacities at the lung bases are consistent with atelectasis . There is a chronic interstitial pulmonary abnormality most conspicuous at the lung bases . There is no focal lung consolidation , however subtle superimposed infectious process is difficult to exclude given underlying lung abnormalities . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Low lung volumes and bibasilar atelectasis . No focal consolidation , however it is difficult to exclude underlying pneumonia given background interstitial abnormality and bibasilar atelectasis .