Abstract
Objective: To describe the prevalence in computed tomography (CT) of the main anatomical variations of the sino-nasal region, in a sample of the Chilean population, and to emphasize the importance of reporting them in the radiology report. Materials and methods: 100 paranasal sinus CT performed at our hospital were retrospectively evaluated. Each CT was evaluated by a neuro-radiologist and a third-year Radiology resident, recording the main anatomical variations of the structure and bone pneumatization of this region. Patients youn- ger than 18 yrs of age, and patients with significant distortion of the sino-nasal anatomy (e.g. tumors, history of facial fracture), were excluded. Results: The different anatomical variations were found in frequencies similar to those described in the international literature. The most common anatomical variation was deviated septum (83%), followed by the presence of Agger nasi cell (66%) and septal spur (45%). The upper attachment of the uncinate process was 68% in the lamina papyracea, 24% in the cribriform plate and 8% in the middle turbinate. Configuration of the ethmoid roof, according to the Keros classification, was 2% type I, 28% type II and 70% type III. The frequency of Keros type III ethmoid configuration was higher than that described in classical studies. The degree of sphenoid sinus pneumatization, according to the Hamberger classification, was 80% sellar, 19% presellar and 1% conchal. In 5%, dehiscence of the bone wall in relation to the carotid channel was recorded, one of these being bilateral. Conclusion: The study of paranasal sinus CT is useful to characterize the anato- mical variations of the sino-nasal region. A precise anatomical knowledge of this region is important; variations in the radiology report should be noted, especially if there is a plan to perform functional endoscopic surgery. Keywords: Anatomical variantions, Computed tomography, Sinuses.
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