Background and Objectives: It is rare to find any studies reporting on the practical measurements of landmarks in the paranasal sinuses that are done intraoperatively as well as comparative analysis on the anatomical and radiological
measurements
of the paranasal sinuses. The aim of this study was to analyze the anatomical measurements of the paranasal sinuses using nasal endoscope and CT scout films to determine the statistical significance. Materials and Methods: In 130 patients
the
authors used bayonet forceps and seekers to measure the distances from the anterior nares to some of the intranasal structures, such as the uncinate process, bulla ethmoidalis, basal lamella, maxillary ostium, posterior wall of ethmoid sinus,
anterior
wall of sphenoid sinus and posterior wall of sphenoid sinus. Then, using the CT scout films, we measured the distances between the anterior nasal spine and the basal lamella (B.L.), the anterior wall of sphenoid sinus (A.W.S), and the posterior
wall of
sphenoid sinus (P.W.S.). We analyzed the mean values of the basal lamella, the anterior and posterior wall of sphenoid sinus from all the available data in order to compare the endoscopic and radiologic measurements, and carried out a paired
t-test.
Results: There was a statistically significant discrepancy in the comparative analysis of the CT scout film and the endoscopic measurements of the basal lamella, anterior wall of sphenoid sinus and posterior wall of sphenoid sinus,
althought
there were no significant discrepancy for basal lamella in female patients (p>0.05). Conclusion: The differences between the CT and operative measurements observed in this study were due to different measuring points, differences in the
measuring
angles, and inaccurate locations of the landmarks on the CT scout films owing to their small sizes. These findings indicate that a more accurate method need to be introduced in using the CT films to measure the anatomical landmarks in the
paranasal
sinuses.
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