Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes cause some bronchovascular crowding . No focal opacity to suggest pneumonia is seen . No pleural effusion , pulmonary edema or pneumothorax is present . There is an area of chronic scarring the the left lung base . The heart size is normal . Calcified right paratracheal and hilar lymph nodes are unchanged .
    OUTPUT:
    
No evidence of acute intrathoracic process .