Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal image of the chest demonstrates improved bilateral pulmonary opacities since prior imaging . The slightly less transparent lungs on this exam are likely secondary to the AP portable technique used on this exam when compared to the previous imaging PA views . The pulmonary vessels appear slightly improved since prior imaging . Cardiomediastinal silhouette is unchanged . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Slightly improved bilateral pulmonary opacities .