Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Stable , moderate cardiomegaly . Stable , small right pleural effusion . Persistent free air beneath the left hemidiaphragm . Persistent opacity at the right base warrants follow - up radiographs to ensure clearance . Improvement in pulmonary edema on the right with resolution on the left . Normal hilar contours .
    OUTPUT:
    
Improvement in pulmonary edema on the right with resolution on the left . Persistent free air beneath the left hemidiaphragm .