Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: LEFT PERIHILAR OPACIFICATION , WHERE THE PATIENT HAS RECEIVED CYBERKNIFE THERAPY , HAS INCREASED SLIGHTLY . There is linear atelectasis at the bilateral lung bases . There is no focal consolidation . No pleural effusion or pneumothorax . Heart size is normal . MEDIASTINAL AND HILAR SILHOUETTES AND PLEURAL SURFACES ARE UNREMARKABLE .
    OUTPUT:
    
THE SLIGHT INCREASE IN RADIODENSITY AT THE SITE OF CYBERKNIFE THERAPY , NOT NECESSARILY COMPLICATION OR RECURRENCE , SHOULD BE EVALUATED WITH CT IF THERE IS CLINICAL CONCERN FOR EITHER .