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Sinonasal tumors have traditionally been a difficult disease process to treat, let alone cure. Although fairly rare, these heterogeneous groups of cancers often carry a guarded prognosis given their aggressive nature and close proximity to the brain and orbit. Traditional studies and techniques have focused on radical resections, but even these surgeries have often resulted in less than optimal disease-free rates. Over the past decade, there has been an evolution in the management of these tumors. Although radical surgeries are still needed for advanced cases, minimally invasive techniques endoscopic equipment, computer-guided navigation, and specialty tools built for the sinuses skull base have changed the way there are operations on these tumors. Combined with earlier detection methods, improved diagnostic imaging, tissue sparing radiation protocols, more effective chemotherapy and increased experience with endoscopic skull base and neurovascular techniques, there are improved morbidity and mortality rates. The purpose of this book is to present a modern way to treat sinonasal tumors with respect to traditional tumor extirpation principles and the need for radical excisions when the indications arise. As technology improves and long-term follow-up grows, there expects to be further successes in the management of tumors long thought to be difficult to treat.