Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post left - sided dual - chamber pacemaker with leads terminating in the right atrium and right ventricle . The cardiac silhouette size appears moderately enlarged with a left ventricular predominance . The aortic knob is calcified . There are low lung volumes which accentuate the bronchovascular markings , and result in mild apparent widening of the superior mediastinum . Fibrotic changes appear to be present and are most pronounced along the periphery and lung bases bilaterally , with coarse interstitial markings . There appears to be blunting of the costophrenic angles bilaterally , which could represent chronic pleural thickening , though small effusions can not be excluded . There is no overt pulmonary edema or pneumothorax . More focal opacity in the left lung base is present , and an underlying infectious process can not be completely excluded . Leftward deviation of the superior trachea above the thoracic inlet is noted and may be due to tortuous vessels .
    OUTPUT:
    
Findings compatible with chronic interstitial lung disease . More focal opacity in left lung base is noted , and an underlying infectious process can not be excluded .