Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is opacification of the right lung base , which may be due to asymmetrical pulmonary edema , but pneumonia should be considered in the appropriate clinical setting . There is no pulmonary edema or pneumothorax . Heart size is mildly enlarged .
    OUTPUT:
    
Right lung base opacity which may be due to asymmetrical pulmonary edema , but pneumonia should be considered in the appropriate clinical setting .