CyberKnife — Death report filed with FDA (MAUDE). A MAUDE report does not establish that the device caused the outcome. Reported narrative: COMPLICATIONS WERE DESCRIBED IN A CLINICAL PUBLICATION TITLED, 'STEREOTACTIC BODY RADIATION THERAPY FOR HEAD AND NECK TUMOR: DISEASE CONTROL AND MORBIDITY OUTCOMES.' ACCURAY CONTACTED THE PHYSICIAN RESPONSIBLE FOR THE TREATMENTS. IT WAS CONFIRMED THAT THE COMPLICATIONS WERE NOT DUE TO A MALFUNCTION OF THE CYBERKNIFE SYSTEM. THE PTS DID NOT HAVE ANY OTHER TREATMENT ALTERNATIVE DUE TO THE NATURE AND EXTENT OF DISEASE; CYBERKNIFE TREATMENT WAS THE ONLY TREATMENT OPTION FOR THESE PTS. THE PTS RECEIVED PRIOR RADIOTHERAPY AND WERE UNDERGOING RE-IRRADIATION BY THE CYBERKNIFE SYSTEM IN AN ATTEMPT TO CONTROL RECURRENT DISEASE. THE REPORTED TOXICITIES EXPERIENCED BY THE PTS ARE KNOWN TO BE ASSOCIATED WITH RE-IRRADIATION.