Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to previous exam from ___ . When compared to prior , there has been interval development of a rounded 4 .5 cm mass in the right middle lobe compatible with patient 's history . Elsewhere , the lungs are clear . There is elevation of the left hemidiaphragm as on prior . There is no pleural effusion . Cardiomediastinal silhouette is unchanged and notable for multiple lead pacing device with lead tips in the right ventricle and right atrium . Epicardial leads are also noted . Partially visualized stent seen in the upper abdomen . Osseous and soft tissue structures are unremarkable .
    OUTPUT:
    
Right middle lobe mass which is new since ___ . Otherwise , no change since prior , without acute cardiopulmonary process .