Objective. Meningiomas and schwannomas represent a subset of primary intracranial tumors that are rarely identified exclusively in the paranasal sinuses. Here, we describe our experience with minimally invasive endoscopic endonasal approaches for the treatment of these tumors. Methods. We retrospectively reviewed the clinical, surgical, and radiographic characteristics of adults with pathologically confirmed sinonasal meningiomas and schwannomas located within the paranasal sinuses that were resected via an expanded endoscopic endonasal approach. Results. Five patients (1 male, 4 females) underwent an endoscopic endonasal approach for resection of sinonasal tumor. Clinical symptomatology most commonly included nasal obstruction, in addition to headache, jaw pain, anosmia, and chronic rhinosinusitis. Tumors were located exclusively within the sinonasal cavity and were on average 2.2？cm (range 1.4–3.8？cm). Pathology revealed 2 cases of meningioma and 3 cases of schwannoma. No evidence of tumor recurrence occurred over average followup of 1.5 years (range 0.11–3.9 years). Conclusion. Our case series suggests that an expanded endoscopic endonasal approach with a combined neurosurgical-otorhinolaryngologic team for the resection of sinonasal meningiomas and schwannomas offers an effective treatment option. Further studies that include a larger number of patients over a longer follow-up period are required to compare outcomes between minimally invasive and open approaches. 1. Introduction Sinonasal schwannomas and meningiomas represent a rare subset of benign sinonasal tumors. Schwannomas originate from neural the crest-derived Schwann cells that line central nerve sheaths. In the head and neck, these tumors are located less than 4% of the time in the sinonasal cavity [1]. In contrast, meningiomas arise from arachnoid cap cells and are even less commonly associated with an extracranial origin (<2%), of which the sinonasal tract is most prevalent [2]. Traditional, transcranial approaches to these lesions are inherently morbid, due to significant brain retraction and complications associated with skin incision and craniotomy. Endoscopic endonasal approaches are becoming increasingly utilized to access these skull base pathologies. For these small, benign lesions extending into the paranasal sinuses, endoscopic approaches offer a minimally invasive approach to tumor resection and, in some cases, complete tumor resection. Endoscopic techniques provide a panoramic view of the lesion and associated anatomy not seen with the microscopic approach. In addition,
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