Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a large opacity of the left lung consistent with a pleural effusion and associated rightward mediastinal shift . There is also some increased vascularity in the right lung and small opacity at the right base which could represent worsening pulmonary edema , pneumonia or atelectasis .
    OUTPUT:
    
1 . Large left pleural effusion , which has increased in size from the prior study . 2 . Increased vascularity at the right lung and subtle opacity at the right base that possibly represents worsening pulmonary edema , infection or atelectasis .