Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 59 4 2021 05 18 203 207 EN Hassan Behboudi Department of Ophthalmology, Eye Research Center, Guilan University of Medical Sciences, Rasht, Iran Abtin Heirati Department of Ophthalmology, Eye Research Center, Guilan University of Medical Sciences, Rasht, Iran Hengameh Behboudi Department of Ophthalmology, Eye Research Center, Guilan University of Medical Sciences, Rasht, Iran Maryam Akbari Department of Otolaryngology and Head and Neck Surgery, Otorhinolaryngology Research Center, Guilan University of Medical Sciences, Rasht, Iran. AND School of Medicine, Guilan University of Medical Sciences, Rasht, Iran Naghi Ramezani Department of Radiology, Sepehr Radiology Center, Guilan University of Medical Sciences, Rasht, Iran. Makan Shalchizadeh Department of Otolaryngology and Head and Neck Surgery, Otorhinolaryngology Research Center, Guilan University of Medical Sciences, Rasht, Iran.ANDSchool of Medicine, Guilan University of Medical Sciences, Rasht, Iran. Abbas Hajian Department of General Surgery, Kashan University of Medical Sciences, Kashan, Iran Shadman Nemati Otorhinolaryngology Research Center, Department of Otolaryngology and Head and Neck Surgery, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran. 2021 01 12 2021 01 25 In this study, we aimed to find the frequency of agger nasi cells (ANC) and their correlation with other anatomical anomalies in dacryocystorhinostomy (DCR) candidates, compared with a control group. The study was conducted on 42 patients with nasolacrimal duct obstruction who underwent DCR surgery. Also, 80 C.T. of healthy sex- and age-matched subjects were selected as the control group. Paranasal sinuses computed tomography scanning was performed preoperatively, and abnormalities including ANC, concha bullosa, osteomeatal complex disease (OMC), nasal septum deviation, and polyposis were investigated and registered. Radiologic findings showed ANC presence in 83.3% of cases, and frequency of concha bullosa was 23.8%, and OMC disease, septal deviation, and nasal polyposis recorded as 11.9%, 85.7%, and 14.3%, respectively. In the control group, ANC was found in 52 subjects (65%), and the difference was statistically significant (P=0.036). There was no significant correlation between the presence of ANC and the coexistence of other mentioned anatomical changes as attributing factors for NLD obstruction. The frequency of ANC was much higher in patients with NLD obstruction compared with the control group, but its association with other anomalies was non-significant. https://acta.tums.ac.ir/index.php/acta/article/view/9087