Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate clear lungs without pleural effusion or pneumothorax . The cardiac silhouette is normal in size . The main pulmonary artery is mildly prominent , which may be a normal variant , however in the appropriate clinical setting pulmonary arterial enlargement can not be excluded on this study . The pulmonary vasculature is normal . No displaced fracture is seen . If there is further concern for rib injury , recommend repeat dedicated views with a BB marker placed to mark the site of the patient 's pain .
    OUTPUT:
    
The main pulmonary artery is mildly prominent , which may be a normal variant , however in the appropriate clinical setting pulmonary arterial enlargement can not be excluded on this study .