<prompt> Recurrent or residual cancer of nasopharynx after super voltage radiotherapy is treated by:Intracavitary radioactive implantsCryotherapySurgeryAll of the above  <response>: If nasopharyngeal carcinoma recurs or is not completely regressed after 6500-7000 cGy radiotherapy, it can be treated by any of the above modes. Surgery involves skull-base and is done in only selected cases. 