Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior radiograph , there is now a new opacity within the right middle lung , most likely infectious in etiology given the clinical history . Since the prior radiograph there has been development of mild pulmonary congestion . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable . The support lines and tubes are unchanged in position . Osseous structures are unremarkable .
    OUTPUT:
    
1 . Right mid-lung pneumonia . 2 . Interval development of mild pulmonary edema .