Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is retrocardiac opacity and right middle and lower lobe ill - defined opacities , concerning for pneumonia . Blunting of the costophrenic angle on the left may also reflect small pleural effusion . There is no pneumothorax . There is mild left apical scarring . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Multifocal pneumonia with a small left pleural effusion .