Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs well expanded . There is a moderate left pleural effusion , which obscures evaluation of the left lung base . Opacity seen in the right lung base medially , consistent with pneumonia . There is no right pleural effusion . The cardiomediastinal silhouette is enlarged but somewhat obscured by the left pleural effusion , similar to prior exam .
    OUTPUT:
    
1 . Opacity in the right medial lung base , consistent with pneumonia . 2 . Moderate left pleural effusion , which obscures evaluation of the left lung base . Can not rule out a concurrent pneumonia or aspiration .