Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . Aortic knob calcifications are demonstrated . The mediastinal and hilar contours are otherwise unremarkable . Diffuse coarse interstitial opacities are seen within both lungs , compatible with a chronic interstitial lung disease . Patchy opacities within the lung bases are more pronounced compared to the prior exam , and could reflect progression of interstitial lung disease , but atelectasis or superimposed infection is not excluded . Previously noted consolidative opacity in the right upper lobe has essentially resolved . No pulmonary edema is present . No pleural effusion , new focal consolidation or pneumothorax is identified . No acute osseous abnormality is seen .
    OUTPUT:
    
Increased patchy opacities in the lung bases may reflect progression of underlying chronic interstitial lung disease , but superimposed atelectasis or infection can not be completely excluded .