Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is mildly enlarged . The aorta is tortuous . Pulmonary vascularity is normal . Streaky opacities in the lung bases may reflect atelectasis although developing infection particularly in the left lung base can not be completely excluded . Vague ___ millimeter nodular opacity projects over the left anterior 1st rib . No pleural effusion or pneumothorax is present . No acute osseous abnormality is seen . No definite displaced rib fractures noted .
    OUTPUT:
    
1 . Streaky opacities at lung bases likely reflective of atelectasis although developing infection in the left lung base can not be completely excluded . 2 . No displaced rib fractures noted , although if there is continued clinical concern for a displaced rib fracture then a dedicated rib series is recommended . 3 . ___ millimeter nodular opacity projecting over the left upper lung field and left anterior 1st rib . Shallow oblique views can be obtained for further assessment to determine if these are nodules within the lungs .