Computerized Tomography (CT Scan) and Magnetic Resonance Imaging (MRI) show the details in the sinus areas. The ethmoid and sphenoid sinuses are difficult to view through endoscopy procedures. The imaging studies can help in identification of any deep inflammation or physical obstruction. It also helps in assessing the extent of spread of the infection to the surrounding tissues such as eyes, ears, mastoid bone and meninges.