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...t for anatomic variants (concha bullosa, agger nasi cell, Haller cell) and for the kind and extent of the disease was calculated by using squared weighted � coefficients. According to Landis and Koch =-=(6)-=-, a � coefficient of less than 0.00 indicated poor agreement; a � coefficient of 0.01– 0.20, slight agreement; a � coefficient of 0.21–0.40, fair agreement; a � coefficient of 0.41–0.60, moderate agre...

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...nsity of the sinus lesions was higher, the overall SNR of T2*weighted and T2-weighted fast spin-echo sequences was lower and image quality was poorer than those of the T1-weighted sequence. Som et al =-=(9)-=- found that there is loss of the MR image signal intensity of paranasal sinus lesions at protein concentrations of more than 40% on T1-weighted images and at protein concentrations of more than 30% on...

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...nusitis. Computed tomography (CT) in the coronal plane has become the method of choice in the evaluation of the paranasal sinuses, particularly for planning functional endoscopic sinus surgery (FESS) =-=(1)-=-. Nevertheless, radiation exposure, artifacts from dental work, and an inconvenient prone patient position are the main limitations of paranasal sinus CT. In some patients, strictly coronal scans cann...

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...ention, such as FESS. The visualization of anatomic details of the paranasal sinuses is necessary, particularly when planning FESS (8). In accordance with the findings of Mafee et al (1) and Zinreich =-=(5)-=-, we found that CT is superior to MR imaging in the delineation of fine bone structures of the infundibular complex; of the bone structures of the orbital lamina, of the orbital floor, and of the crib...

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...han the prevalence of inflammatory paranasal disease because the patient population in our study was preselected. However, the frequency of the disease we found is higher than that reported by others =-=(7)-=- in larger, preselected patient populations. An explanation for the higher frequency of disease in our study compared with that in the literature could be the small size of our patient group. Accordin...

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...aterial containing water (mucus or mucosa). ning a therapeutic intervention, such as FESS. The visualization of anatomic details of the paranasal sinuses is necessary, particularly when planning FESS =-=(8)-=-. In accordance with the findings of Mafee et al (1) and Zinreich (5), we found that CT is superior to MR imaging in the delineation of fine bone structures of the infundibular complex; of the bone st...

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...n limitations of paranasal sinus CT. In some patients, strictly coronal scans cannot be acquired owing to restricted extension of the neck. Some of these limitations can be avoided by using spiral CT =-=(2)-=-. Magnetic resonance (MR) imaging is a possible alternative to CT in the evaluation of the paranasal sinuses. The main limitations of MR imaging in the evaluation of the paranasal sinuses are a limite...