Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Apart from subsegmental atelectasis in the left lung base , the lungs are clear . No large pleural effusion or pneumothorax is seen although the extreme right costophrenic angle is excluded from the field of view . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary abnormality .