Abstract
Surgical treatments for postoperative maxillary cysts include the peroral method (trans-maxillary sinus method) in which the cyst wall is totally removed or conserved, and opened to the nasal cavity by incising from the gingiva, and the endonasal method in which the cyst wall is opened to the nasal cavity by the nasal approach. Recently, the endonasal method is more widely used because CT and endoscopy can be applied. Forty-two patients (56 sides) who underwent surgery for postoperative maxillary cysts in Nanyo City Hospital over the last four years were reviewed. Preoperative CT findings, surgical methods, operative findings and prognosis were analyzed. Forty-one sides were monocystic and 15 sides were multicystic. Forty-two sides were of the medial type, 4 sides were of the lateral type and 10 sides were of the mixed type. Twenty sides (35.7%), which were both monocystic and medial, were operated on by the endonasal method, while the transmaxillay sinus method was used for the remaining sicks. Though one of endonasal patients experienced a relapse of the maxillary cyst, the endonasal method was associated with less suffering and a shorter operative time than the trans-maxillary sinus method. Therefore, the endonasal method is recommended, if the postoperative maxillary cyst is both monocystic and medial.
