The preoperative radiological findings associated with failure of frontal sinusotomy: A prospective study.

The Harvard, Kennedy and Lund-Mackay scores could not predict the frontal sinusotomy patency outcome. Failed cases were associated with advanced degrees of mucosal pathology in the preoperative CT scan. Sinuses ostia with anteroposterior diameters less than 5.36 mm showed more susceptibility for sinus restenosis postoperatively. The variability of the anteroposterior length of the frontal recess did not affect the surgical outcome.