Atypical Three Cysts of Postoperative Cyst

All of the cases presented could be considered to have developed from the mucosa of alveolar recessus at the bottom of the antrum which had been left behind in case of Caldwell-Luc's operation. In the well-developed antrum the mucosa of alveolar recessus may be liable to be left behing and to cause a cyst in the future. Attention should be paid to differentiate the other kinds of cyst of dental origin which bear some resemblance of the symptom to postoperative maxillary cyst.