Fig. 2

Changes of sinusitis as depicted by the differences between pre-RT and post-RT CT images. a is the pre-RT CT image of a patient who presented with bilateral maxillary sinusitis. b is a follow-up CT image of the same patient taken at 1 year post-RT. As shown, the bilateral sinusitis was diminished. This patient has been disease free for 5 years. c is the pre-RT CT image of another patient showing no evidence of sinusitis. d is a follow-up CT image of the same patient taken at 1 year post-RT. As shown, the patient had developed bilateral maxillary sinusitis at 1 year post-RT, and a biopsy confirmed local recurrence