A Review of the Different Intraoperative Findings of Revision Endoscopic Frontal Surgery.

A revision endoscopic sinus surgery (rESS) is considered when the primary surgery fails to improve the symptoms or causes problems. The rESS is still a difficult surgical procedure, despite the use of imaging-guided surgical navigation systems, because the anatomical landmarks are removed or scarred. To determine the causes and indications of rESS observed radiologically or endoscopically in patients with frontal rhinosinusitis.