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Genuine mucocele of the maxillary sinus is very rare. We would like to report 5 cases diagnosed as mucocele of the maxillary sinus and opereted in past fifteen years. We classified the disease into two types (A. and B.) according to rhinoscopic findings. Type A shows principally a bulging of the lateral wall of middle meatus, while'type B shows a swelling of the whole lateral wall of the nasal cavity. We discussed the development of these two types of mucocele. Accurate diagnosis of the disease and differential diagnosis from other benign cysts of the upper jaw involving the antrum were also discussed. For correct diagnosis, histological examination should be done to demonstrate that the cyst wall is derived from the mucous membrane of the sinus (rhinogenic mucous menbrane).

THE MECHANISM OF DEVELOPMENT OF MUCOCELE OF THE MAXILLARY SINUS AND ITS DIAGNOSIS