Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior chest radiograph , the top - normal heart size is unchanged . No focal consolidation , pleural effusion , or pneumothorax . Mediastinal and hilar silhouettes are unchanged . Rightward bowing of the trachea may be due to the origin of the innominate artery .
    OUTPUT:
    
No focal consolidation or pneumothorax identified .