Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . Aeration of the lungs has improved since ___ ; peripheral opacities have cleared . A diffuse interstitial pattern of pulmonary opacity remains . Minimally increased left lower lobe opacity is attributable to atelectasis . There is no effusion or pneumothorax . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
Improved aeration of the lungs peripherally . Persistent interstitial opacity compatible with known PCP .