Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since prior , there is no significant interval change in bilateral asymmetric airspace opacities in the right lower and left upper lung zones , which together with engorged vessels suggest pulmonary edema . Left pigtail is unchanged in position . Cardiomediastinal silhouette is unchanged . There is no pneumothorax .
    OUTPUT:
    
No significant interval .