Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and well - aerated lungs which are clear . Again seen is apical scarring , unchanged . There is no evidence of pneumomediastinum or intraperitoneal free air . No pleural effusion or pneumothorax is identified . The previously seen nodular opacity is not as well appreciated on today 's exam .
    OUTPUT:
    
No evidence of pneumomediastinum or intraperitoneal free air .