Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . Diffuse predominantly subpleural fibrosis is re - demonstrated with superimposed increased interstitial abnormality , likely reflecting mild pulmonary edema . Additionally a more focal opacity in the left lower lobe is concerning for pneumonia . No pleural effusion or pneumothorax . The heart and mediastinal contours are unchanged .
    OUTPUT:
    
Left lower lobe pneumonia and mild pulmonary edema superimposed upon severe pulmonary fibrosis .