Long term radiographic observation of growth process of 2 simple bone cysts

Simple bone cyst is no longer considered rare today.However, the etiology and growth process of the disease are still unknown.In this report of 2 cases, the authors present 3 cysts in the mandible.All of their records since the first examination could be traced back in 7-year and 9-year previous orthopanoramic radiography.Case 1: An 18-year old boy.The cyst of the right mandible had developed from the right molar region near the mental foramen and the left ascending ramus along the mandibular canal for 9 years.Case 2: A 16-year old boy.The lesion originated in the area under the apex of the left canine near the mental foramen and had developed for 7 years.We supposed the origin of these two cases may have been in contact with mandibular canal.