Abstract
The post-operative cysts of the posterior ethmoidal sinus or the sphenoidal sinus show lower incidence than that of the cysts in the maxillary sinus and the frontal sinus. However, the postoperative cysts of the posterior parananal sinuses often cause visual disturbance as their principal symptom. We have experienced 19 cases of postoperative posterior parananal sinus cysts with visual disturbance during 1980-1987. The clinical symptoms, X-ray findings, surgical findings, surgical technique, prognosis of visual disturbance and mechanism of development of disease are discussed.
