Sinonasal Tract: Nonneoplastic

If it appears strange that that one etiologic agent gives rise to such a diversity of disease, then consider the three major components of any infectious process: (1) the inherent virulence of the agent, (2) the infectious dose, and (3) the patient status. Allergic fungal sinusitis represents the most common form of sinonasal fungal disease. Invasive fungal sinusitis {acute, ( 12 weeks)} represents the most serious sinonasal fungal disease, which develops in the setting of neutropenia, or neutrophil dysfunction. Other more rare and exotic sinonasal infectious conditions, or infectious mimickers are also discussed in this chapter.