If not coincidence, at least it was in the same decade when endoscopic sinus surgery and computed tomography were introduced to Otolaryngologists, which have changed the approach to sinonasal problems dramatically. Probably, there are no such coincidences in the history of medicine where two new modalities of approaches appeared at the same time, to deal with the same problem and complement each other while doing so. The asset of improved visualization and magnification, available through endoscopes, has revolutionized the understanding of the pathophysiology of sinusitis, and resulted in better appreciation of the anatomy of the paranasal sinuses. However, non-invasive diagnostic endoscopy has its limits, and the deeper structures cannot be evaluated by endoscopy alone . Computed tomography, which has an ability to optimally display bone, soft tissue and air simultaneously, can not only complement endoscopic examination, it can provide a surgical road map delineating the anatomy, defining the obstructing lesions, and noting anatomic variations that may predispose to operative complications.
Computed tomography has scored over plain radiographs and polytomographs as an imaging modality in this area. Even though surpassing CT's capacity to image soft tissue, MRI is less suitable as an imaging modality for evaluation of this area because of the similar signal intensities for bone and air.
CT scanning has become imaging modality of choice and the cooperation required between the Radiologist and the Surgeon is mandatory for both evaluation and treatment of paranasal disorders. It is of paramount importance on the part of the Otolaryngologists to understand interpretation of CT films, Radiological anatomy of the paranasal sinuses, Anatomical variations and the pathology to complement the endoscopy findings for initial screening, surgical planning, reduce postoperative complications and to provide better results. This Presentations is prepared to help Otolaryngology colleagues to learn the Imaging/radiological aspects required for endoscopic sinus surgery.