Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiographs on ___ , there is a new left lower lobe opacity . There is bibasilar atelectasis and small left pleural effusion with blunting of the right costophrenic angle . No pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Left lower lobe pneumonia . Small left pleural effusion .