Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left pacemaker generator and leads are in unchanged position . Heart size is normal . The aorta is mildly tortuous . An opacity at the left lung base allowing for technical differences is improved and likely represents pleural thickening and mild atelectasis . Platelike atelectasis in the left midlung is unchanged . There is no intraperitoneal free air . There is a small left pleural effusion .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Improved small left pleural effusion and adjacent atelectasis