Assessment of Frequency and Anatomical Characteristics of Haller Cells in Cone-Beam Computed Tomography Scans of Patients Referring To A Private Oral and Maxillofacial Radiology Clinic During 2015-2017

Background and aim: haller cells are one of the anatomical variations in the orbital area, which are important in endoscopic surgical procedures and have a role in the pathogenesis of some diseases including sinusitis and chronic craniofacial pain. the frequency of haller cells has been reported in a wide range, which can be attributed to several factors. the purpose of this study was to determine the frequency and anatomical characteristics of haller cells. materials and methods: this descriptive study was performed on 381 patients referring to a private oral and maxillofacial radiology clinic during 2015-2017. these patients needed cone-beam computed tomography (cbct) for various reasons. all cbct scans were observed by a radiologist. the results were statistically analyzed by chi-square test using spss version 16.0 software. results: from 381 patients, 34 patients (8.9%) had haller cells. sixteen patients (47.05%) had haller cells on the right side, 15 patients (44.11%) showed these cells on the left side, while 3 patients (8.82%) had these cells on both sides. on the right side, the oval shape showed the highest frequency (n=9; 47.3%). 36.8% and 15.7% of the right-sided haller cells were round (n=7) and pyramidal (n=3), respectively. on the left side, the circular shape had the highest frequency (n=8, 44.4%). furthermore, 27.7%, 16.7%, and 11.1% of the left-sided haller cells were oval (n=5), pyramidal (n=3), and teardrop-shaped (n=2), respectively. conclusion: the prevalence of haller cells in our study was 8.9%. genetic and racial factors, radiographic techniques, and the age range of patients are some of the reasons for different results.