Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is large , rounded peripheral opacity in the right upper lobe , which is concerning for infection in the setting of fever . The left lung appears clear . There is no pneumothorax or significant pleural effusion . No evidence of pulmonary edema . Mild atelectasis is noted in the right lung base . The heart size is normal . Tortuosity of the aorta as likely relate to patient positioning .
    OUTPUT:
    
Probable large " round pneumonia " in right upper lobe . Minor atelectasis in the left perihilar and right basilar regions .