Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was obtained . Large hiatal hernia is re-demonstrated with interval increase in surrounding right basilar opacity which is likely due to effusion and atelectasis , though developing pneumonia can not be excluded entirely . The remainder of the lungs are clear . There is no pneumothorax or left pleural effusion . The heart is normal in size with normal mediastinal and hilar contours aside from slightly prominent ascending aortic contour likely due to tortuosity .
    OUTPUT:
    
1 . Apparent increase in right basilar opacity is likely due to pleural fluid and atelectasis , but infectious process or aspiration can not be entirely excluded . 2 . Large hiatal hernia