Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP view of the chest . Bilateral lower lobe interstitial opacities are similar to findings seen on ___ . If acute , this is concerning for PCP . The left hilum is slightly enlarged and stable . There is no pleural effusion or pneumothorax . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
Bilateral lower lung interstitial opacities concerning for PCP if this is an acute episode . Findings are similar to chest radiograph from ___ ; however , no chest radiographs have been done since then for comparison . These findings were not apparent on ___ .