Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are relatively well inflated , with persistent scarring in the left lung base , with no focal consolidation identified . The heart size is stable compared to prior studies . A right chest wall pulse generator is unchanged in position , with leads terminating in the right atrium and right ventricle , as before . There is no large pleural effusion , overt pulmonary edema , or pneumothorax .
    OUTPUT:
    
Stable left basilar scarring and mild cardiomegaly , with no evidence of pneumonia .