Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior , there has been no significant interval change . The lungs are grossly clear . Severe cardiomegaly , mediastinal , and hilar contours are unchanged . There is no pneumothorax , pleural effusion , or pulmonary edema .
    OUTPUT:
    
No significant interval change . No convincing signs of aspiration .