Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac borders are obscured , noting low lung volumes , but the heart appears probably enlarged with a left ventricular configuration . The aortic arch is calcified . The right hilum is enlarged which is suspected to reflect primarily enlargement of central pulmonary arteries . Diffuse opacification has increased . The right lung base is better aerated but there is a persistent opacity at the left lung base , probably due to atelectasis . A background of moderate pulmonary edema appears somewhat worse .
    OUTPUT:
    
Some worsening of pulmonary edema . Better aeration at the right lung base .