Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates a normal cardiomediastinal silhouette and well - aerated lungs . Relative lucency of the upper lungs is suggestive of emphysema . Slightly increased focal opacity in the right lateral lung is suggestive of an infectious process . Left base atelectasis is noted . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Focal opacity in the right lateral lung is suggestive of a right lower lobe pneumonia .