Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . Mild atelectasis at the left base . Otherwise , the lungs are clear and there is no evidence of pulmonary edema . The mediastinal and hilar contours are normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Mild cardiomegaly , but no evidence of pulmonary edema or pleural effusion .