Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is bibasilar atelectasis related to low lung volumes . There is mild right upper lobe scarring , potentially the sequelae of prior infectious process . There is no focal consolidation , pleural effusion , pulmonary edema , or pneumothorax . The cardiomediastinal silhouette is within normal limits . The aortic arch is heavily calcified .
    OUTPUT:
    
No acute intrathoracic process .