Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Shallow inspiration accentuates heart size , pulmonary vascularity . Retrocardiac opacity is new , atelectasis versus pneumonitis . Small left pleural effusion . No pneumothorax .
    OUTPUT:
    
New retrocardiac opacity , atelectasis versus pneumonitis . Heart size and pulmonary vascularity are prominent , accentuated by shallow inspiration .