Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta remains mildly tortuous . Hilar contours are normal , and no pulmonary vascular congestion is noted . Rounded opacity within the right lung base measuring up to 19 mm is new compared to the prior exam . Left lung is clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
19 mm rounded opacity within the right lung base could reflect a neoplasm , though infection is not excluded . Further assessment with chest CT is recommended .