Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior exam , nodular parenchymal opacities in the right lung are less conspicuous with minimal residual asymmetric increased opacity in the right compared to the left lung . No new parenchymal opacities . No pleural effusion or pneumothorax . No edema . The heart is normal in size . The mediastinum is not widened . Aortic knob calcifications are mild . Multilevel degenerative changes of thoracic spine are moderate to severe .
    OUTPUT:
    
Minimal residual asymmetric right lung parenchymal opacities since ___ which were concerning for pneumonia have markedly improved .