Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest demonstrates normal lung volumes . No pleural effusion or pneumothorax . An ill - defined right lung base opacity is noted . Heart size is normal . Subtle rounded bilateral lucencies , correspond to centrilobular emphysema , better demonstrated on CT exam of the same date . Inferior aspect of the right hilum appears prominent .
    OUTPUT:
    
1 . An ill - defined right lung base opacity may represent atelectasis , infection or aspiration . There is associated fullness of the inferior aspect of the right hilum . 2 . Centrilobular emphysema is better demonstrated on the CT exam of the same date .