Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval progression of previously visualized retrocardiac opacity which silhouettes the left hemidiaphragm and may be suggestive of pneumonia in this region . Furthermore , there is now a new opacity silhouetting the right heart border suggestive of right middle lobe pneumonia . Otherwise , there is no evidence of pneumothorax . While evaluation of the cardiomediastinal silhouette is limited due to silhouetting by opacities , the visualized cardiomediastinal silhouette appears stable . There is no evidence of pneumothorax .
    OUTPUT:
    
There is a new right middle lobe opacity suggestive of middle lobe pneumonia . Furthermore , there has been progression of the previously visualized retrocardiac opacity which silhouettes the left hemidiaphragm and is suggestive of left lower lobe pneumonia . In the proper clinical setting , the combination of these findings may be representative of multifocal pneumonia .