Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right Swan - Ganz catheter , endotracheal tube and chest tubes have been removed . The right central venous sheath remains . Sternal wires are intact in good position . Right upper lobe and middle lobe subsegmental atelectasis have improved . Mild interstitial edema has improved . The cardiac silhouette remains moderately enlarged . Blunted left costophrenic angle could represent small effusion .
    OUTPUT:
    
No pneumothorax . Interval improvement subsegmental atelectasis and mild interstitial edema .