Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: 4 cm rounded opacity right upper chest , may represent pleural or lung mass , infiltrate . There are small bilateral pleural effusions , more prominent on the right . Minimal left costophrenic angle atelectasis or infiltrate . No pneumothorax . Normal heart size , pulmonary vascularity . Minimal retrocardiac atelectasis or infiltrate .
    OUTPUT:
    
4 cm rounded opacity right upper chest , may represent pleural or lung mass , infiltrate . Small pleural effusions . Minimal retrocardiac atelectasis or infiltrate .