Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left chest wall pacer and 3 leads are seen in the expected position . The cardiomediastinal and hilar contours are within normal limits . The aorta is minimally tortuous and shows mural calcification . There is no pneumothorax . There is a diffuse bilateral interstitial abnormality of uncertain chronicity or significance . There is no focal consolidation , or pleural effusion .
    OUTPUT:
    
No evidence of pneumothorax status post left pacemaker placement . Pacemaker is in expected position . Mild interstitial abnormality of unknown significance or chronicity .