Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left lower lung opacity silhouetting the left cardiac border . Some of this is thought to be due to a fat pad given similar appearance on ___ however it is more conspicuous on today 's exam . Cardiomediastinal silhouette is otherwise unremarkable . No acute osseous abnormalities .
    OUTPUT:
    
Opacity silhouetting the left cardiac margin in part due to prominent pericardial fat pad although is more prominent when compared to remote prior exam which raises the possibility of superimposed parenchymal consolidation .