Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged , which is possibly significant noting the young age of the patient . The lungs appear clear . There is no pleural effusions or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Apparent cardiac enlargement . If the etiology for suspected cardiac enlargement is not known , then echocardiography should be considered in addition to correlation with other clinical factors . No evidence of acute cardiopulmonary disease .