Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph demonstrates minimal bibasilar airspace opacity , likely reflecting atelectasis . There is no pleural effusion or pneumothorax . There is mild to moderate cardiomegaly , the mediastinal contours are normal .
    OUTPUT:
    
Bibasilar atelectasis , cardiomegaly , without acute chest abnormality .