CT-based radiotherapy treatment planning for cancer of the nasopharynx.

We analysed 32 cases of nasopharyngeal carcinoma (NPC) treated with radiotherapy trying to define the role of CT scan during radiotherapy planning, as well as radiation treatment and the follow-up of the patients. CT scan was found to help 15 cases with low-parapharyngeal involvement and/or bone erosion. Persistent abnormal CT findings at 2 mo after the end of radiation treatment were related to a 30% local recurrence rate. This rate went up to 100% in case of skull-base destruction.