Introduction. The occurrence of cysts of the paranasal sinuses (PS) in the population reaches 35.6%. In the structure of the pathology of ENT organs their specific weight is 3.9%, among PS diseases 12.6%. Most often (93.3% of cases) cysts are localized in the maxillary sinuses (MS). The disease occurs in different age groups, most often between the ages of 18 and 59, with the same frequency among persons of both sexes. The pathogenesis of the PS cysts is inconclusive. Objective. To determine the linear dimensions of anatomical nasal cavity for patients with cysts of maxillary sinuses. Material and methods. CT scans were randomly sampled from 41 patients (18 males and 23 females) with cysts of the maxillary sinuses. the following sizes were taken into account: width of the general nasal stroke at the level of an average nasal sink in the projection of a natural MS sauce, distance between an average and lower nasal sink at the level of a front end of an average nasal sink, at the level of an upper jaw sinus sauce and at the level of a back end of an average nasal sink; linear sizes Bulla ethmoidalis in three planes. In addition, the presence of additional MS, Concha bullosa, Galler cells was determined. Results. On the localization side of the MS cyst reliably more often than on the counter-lateral side and in rhinologically healthy people, changes were recorded such as a decrease in the distance between the lower nasal shell and the front end of the middle nasal shell, between the middle nasal shell and the septum, statistically confirmed decrease in the transverse diameter of Bulla ethmoidalis. Conclusion. The data obtained testify to the possible significance of the listed changes in intracranial anatomical structures in the formation of the prerequisites for cystic development of the maxillary sinuses.