frequency of maxillary sinus mucous retention cysts in a central brazilian population

statement of the problem: mucous retention cysts (mrcs) of the maxillary sinus are lesions with undefined pathogenesis. in recent researches, geographical and climatic aspects have been related as risk factors. purpose: the purpose of this study was to determine the frequency of mrcs of the maxillary sinus using panoramic radiographs. materials and method: a total of 631 panoramic radiographs were selected from a secondary database from a private radiology clinic and analyzed by two specialists in dental radiology according to gender, age, month, relative air humidity, and mean temperature. results: a total of 87 (6.89%) radiographic images were suggestive of mrcs. thirty-five mrcs (40.22%) were detected on the right side, 10 (11.49%) on the left side and 42 (48.29%) on both sides. a high frequency was detected in female participants (n=45; 51, 72%), those aged 18-35 years (n=31; 35, 63%) and those from august (n=24; 27.59%) and july (n=22; 25.29%). conclusion: the frequency of mrcs was low, and no statistically significant correlation was found between the prevalence of mrcs and the studied variables with the exception of the mean temperature.