Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is new retrocardiac opacity consistent with left lower lobe pneumonia . Mild elevation of the right hemidiaphragm is again noted with stable blunting of the right CP angle suggesting small right pleural effusion versus pleural thickening . No pneumothorax . No edema . Cardiomediastinal silhouette is stable . No acute osseous abnormalities .
    OUTPUT:
    
Left lower lobe pneumonia .