Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . Mediastinal hilar contours are unremarkable . Pulmonary vasculature is normal . There is minimal atelectasis in the left lower lobe . Right lung is clear . No pleural effusion or pneumothorax is seen . No acute osseous abnormalities demonstrated .
    OUTPUT:
    
Mild left lower lobe atelectasis . Otherwise , no acute cardiopulmonary process .