Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased interstitial markings are again seen diffusely bilaterally suggest mild interstitial edema / vascular congestion . A more focal opacity at the right mid to lower lung may relate to the underlying interstitial abnormality however , a superimposed pneumonia is not excluded in the appropriate clinical setting . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are stable . Chronic lateral left lower rib deformity is again noted .
    OUTPUT:
    
Diffuse increase in interstitial markings suggest mild interstitial edema superimposed on COPD . More focal opacity at the right mid to lower lung may relate to the above findings however , a superimposed pneumonia is not excluded in the appropriate clinical setting . .