Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded . There is a faint ___ mm well - circumscribed opacity in the right upper lung near the periphery . The heart size is top - normal . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
___ mm opacity in the right upper lung should be evaluated with chest CT . This could be a confluence of shadows .