Clicking a few pages more on google brought up another study by Dr. Huang et al on oral cancer patients concluding that [quote]Endoscopic sinus surgery is an effective treatment for irradiation-induced rhinosinusitis in NPC patients, improving ventilation and drainage of the paranasal sinuses, and facilitating regeneration of the sinus mucosa. [/quote]
Mine's not that bad, but here's the link
endoscopic sinus surgery on irradiation-induced rhinosinusitis The technical cite for the study is
Otolaryngology Head Neck Surgery October 1, 2008 vol. 139 no. 4 575-579