Sinonasal inflammatory disease.

Inflammatory sinus disease is ubiquitous. Patients with recurrent or unilateral disease and those who do not respond to treatment require imaging. Computed tomographic scanning is the mainstay of investigation; magnetic resonance imaging is used as a problem-solving tool. The imaging characteristics of sinonasal inflammatory conditions are varied. The role of imaging is to identify patterns of disease, provide a roadmap for the endoscopist, identify anatomical variants that impact on drainage, and exclude aggressive pathology.