Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle airspace opacities are noted at the bilateral lung bases , but more prominently on the right , and may represent a focal pneumonia . There is no evidence of pneumothorax , pleural effusion , or frank pulmonary edema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Possible right lower lobe pneumonia .