Two cases of simple bone cyst which appeared in the mandibular body region in a 31-year-old man and 26-year-old man were reported. The cyst in the former was curetted, but in the latter it was preserved after extraction of the unerupted mandibular third molar which had been enveloped. The cavities were filled roentgenographically on the healing of the lesion in both cases. 54 cases of simple bone cyst shown in the Japanese articles and in this article were evaluated
