Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is diffusely calcified . Mediastinal hilar contours are unchanged without evidence for pulmonary vascular congestion . Severe emphysema is again noted with marked lung hyperinflation . Linear and patchy opacity in the left lung base may reflect atelectasis and scarring , but appears more pronounced than on the prior chest radiograph from ___ and infection is not excluded in the correct clinical setting . No pleural effusion or pneumothorax is present . No acute osseous abnormalities detected .
    OUTPUT:
    
Left basilar patchy and linear opacities may reflect atelectasis and scarring , but appears more pronounced than on the prior exam from ___ and infection can not be excluded in the correct clinical setting . Severe emphysema .