Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . A 2 .7 x 2 .6 cm rounded structure is noted in the right mid paramediastinal region which appears slightly increased in size compared with prior exam . Although , this may represent the main right pulmonary artery a hilar lesion can not be excluded . Otherwise , the cardiomediastinal contour is unremarkable . There is no cardiomegaly . There is no pleural effusion or pneumothorax . No rib fractures are identified .
    OUTPUT:
    
Apparent right paramediastinal nodule may represent a prominent vessel versus a hilar mass . Further assessment with chest CT is recommended .