Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A Swan - Ganz catheter tip now lies slightly more distal in the right pulmonary artery . Clinical correlation regarding slight retraction is requested . Again seen are diffuse interstitial and alveolar opacities in both lungs . Allowing for technical differences , there appears to been slight improvement in the upper zone and along the upper periphery of both right and left lungs . Otherwise , I doubt significant interval change . No pneumothorax is detected . Small effusions can not be excluded .
    OUTPUT:
    
Spine Swan - Ganz catheter tip overlies right pulmonary artery , somewhat distal . Clinical correlation regarding slight retraction is requested . Persistent diffuse interstitial and alveolar opacities , but with suggestion of slight interval improvement .