Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is an opacity in the mid right perihilar region , overall similar to the prior exam . The heart size is normal . Mild prominence of the hila , is suggestive of lymphadenopathy . The mediastinal contours are unremarkable . There is no pleural effusion or pneumothorax . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Right perihilar opacity is likely secondary to atelectasis . No focal consolidations concerning for pneumonia identified .