Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . There is minimal bibasilar atelectasis . No convincing evidence of pneumonia . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no pulmonary edema . A ___ implanted arrhythmia recorder is noted in the left chest wall .
    OUTPUT:
    
Mild bibasilar atelectasis but no evidence of acute cardiopulmonary abnormality .