Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a loculated right hydropneumothorax , slightly improved since the prior exam . Mild pulmonary edema is noted . Patchy opacities in the left mid lung zone may represent asymmetric edema ; however , infection is also possible . Cardiomediastinal silhouette is moderately enlarged . Median sternotomy wires are intact .
    OUTPUT:
    
1 . Small right hydropneumothorax , slightly decreased since the prior exam . 2 . Opacity in the left mid lung may represent asymmetric edema ; however , infection is also possible .