Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is minimally enlarged . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear . There may be a trace left pleural effusion . No pneumothorax is seen .
    OUTPUT:
    
Possible trace left pleural effusion . No focal consolidation or pneumothorax . .