RESUMEN
We defined a standardized approach to surgery of sinonasal inverted papillomas (IP) for adequate and safe resection. A cohort of 65 patients treated from January 1995 to December 2005 at a single institution was retrospectively analyzed (mean follow-up: 28 months; range 1-132). The extension of the tumor was evaluated on clinical findings and computed tomography (CT) scan and/or resonance magnetic imaging (RMI). External and endoscopic surgical approaches were compared according to tumor extension, rate of local recurrence. Univariate analysis was used to review the impact on disease-free survival of factors related to the histopathological findings and the treatment. Endoscopic (alone or combined with transantral approach) and external surgery were used in 46 patients (71%) and 19 patients, respectively. Endoscopic approach (34/46) was performed to control IP in the nasal fossa, the ostiomeatal complex, the sphenoid sinus. It was combined with Caldwell-Luc procedure (12/46) for tumor extent into the lateral part of the maxillary sinus. The mean time for recurrences to occur was 19 months with range of 5-35 months. The rate of local recurrence was 17.6% (6/34) in endoscopic approach alone, 8.3% in endoscopic approach combined with a Caldwell-Luc procedure and 15.8% (3/19) in external approach. Tumor extension, excision with safe margins, associated malignancy or dysplasia have no significant impact on disease-free survival regardless of surgical procedure. On the basis of imaging evaluation and peroperative view of tumor extent, we propose a surgical strategy in which endoscopic approach could be used on the first attempt by trained surgeons. RMI is very useful to determine acute extent of the disease.