Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is left basilar opacity silhouetting the hemidiaphragm with adjacent parenchymal opacities . The right lung is clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Left basilar opacity silhouetting the hemidiaphragm which could be component of effusion with potential loculation with adjacent atelectasis . Infection is not excluded . Appearance is similar compared to ___ .