Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior study , there is a pulmonary opacification over the lower thoracic spine , not definitely seen on the frontal view . This suggests the presence of a posterior lower lobe pneumonia . There is also blunting of the bilateral costophrenic angles , suggesting effusion . The heart , mediastinal , and hilar contours are stable compared to the prior study .
    OUTPUT:
    
1 . New opacification in the posterior lower lung on the lateral view , not seen on the PA view , is consistent with a posterior lower lobe pneumonia . 2 . Bilateral small pleural effusions .