Morbidity of multimodal treatments including endoscopic surgery for sinonasal malignancies: Results of an international collaborative study on 940 patients (MUSES).

Our study shows that modern endoscopic treatments and radiotherapy for sinonasal malignancies are associated with limited morbidity and treatment-related mortality. CSF leak and radionecrosis, although rare, remain the most frequent complications and should be further addressed by future research efforts.