• Frontal sinusotomy;
  • endoscopic sinus surgery;
  • frontal sinus patency;
  • eosinophilic chronic rhinosinusitis



The frontal recess is the drainage pathway that connects the frontal sinus to the anterior ethmoid sinus. Mechanical obstruction is the primary cause of chronic frontal sinusitis with or without a secondary inflammatory process. Eosinophilic inflammation is one of the underlying causes for chronic rhinosinusitis.


To evaluate long-term frontal sinus patency after endoscopic frontal sinusotomy in chronic rhinosinusitis patients and to assess the effect of eosinophilic inflammation on frontal sinus patency.

Study Design:

Retrospective chart review. Symptom assessment and archived endoscopic photographs were prospectively collected on patients who underwent frontal sinusotomy between 7-1-1999 and 12-31-2000. Subjective symptom improvements were evaluated using the SNOT-20 = 20-item Sino-Nasal Outcome Test. Objective findings of endoscopic frontal sinus patency were documented by archived digital photography.


A total of 161 patients with 294 frontal sinuses who underwent endoscopic frontal sinus surgery in the 18 months had an average follow-up of 45.9 months. The patient population was divided into two groups: 58 patients had eosinophilic CRS (ECRS), and 103 patients had CRS without eosinophils (non-ECRS). The mean follow-up for patients with ECRS is 61.6 months and 37.0 months for non-ECRS patients. The non-ECRS patients had a documented endoscopic frontal sinus patency of 90%, and the ECRS patients had an endoscopic frontal sinus patency of 85%. The overall frontal ostium patency rate for all patients was 88.0%.


Long-term endoscopic confirmation of frontal ostium patency demonstrates that endoscopic frontal sinusotomy can yield high quality, durable results. There was no significant difference in patency results between ECRS and non-ECRS patients. Laryngoscope, 2009