Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An opacity at the base of the right lung is not similar in appearance to chest radiograph on ___ and may represent overlapping structures . However , an opacity in the retrocardiac clear space on the left is new . Additionally , there is an opacity at the left posterior costophrenic The cardiomediastinal silhouette and hilar contours are normal . There is no pneumothorax . Sternotomy wires and surgical clips are again seen and not significantly changed in appearance .
    OUTPUT:
    
Left basilar opacity which could be compatible with infection . Recommend repeat imaging after treatment . If no clincal concern for infection , consider chest CT for further evaluation .