This paper reports a case of herniation of an antral polyp through an oroantral fistula, appearing as a polypoid lesion of the alveolar ridge. The patient was a 24-year-old female, and her upper molar had been extracted two months previously. The lesion was asymptomatic, and was a soft tissue mass, red in color and nontender to palpation, involving the alveolar ridge in the maxillary molar area. Review of the literature yielded only a few other such cases.