1. X-ray findings ： There is a well-defined unicystic irregular shaped pericoronal radiolucence without corticated margin associated with an unerupted 38 tooth in the cyst extending from distal aspect of the unerupted tooth 37 up to approximately 2/3 left ramus and from superior border of ramus down to left mandibular angle

2. Muralameloblastoma 病理特徵 屬於 unicystic ameloblastoma 其中一種 tumor 會侵入 cystic wall(fibrous tissue) ，往 外增生，癒後最差

3. Ameloblastoma 臨床上 ameloblastoma 分成三大類： conventional / multicystic type ( 86% ) unicystic type ( 13% ) - luminal ameloblastoma - intraluminal ameloblastoma - mural (wall) ameloblastoma Peripheral (extraosseous) type ( 1% )

4. Ameloblastoma unicystic ameloblastoma 和 conventional ameloblastoma 的比較： conventional ameloblastomaUnicystic ameloblastoma Case 比例 about 86% of all casesabout 13% of all cases Shapemultilocular radiolucenceUnicystic radiolucence 發生位置 20% in maxilla 80% in mandible 56% in mandibular molar, ramus region 90% in ramus region 發生年齡 40 、 50 歲的時候診斷出來，發生 的平均年齡大約是 39 、 40 歲左右 18-20 歲 recurrent rate 50-90%10-20%

5. X-ray findings ： There is a small well-defined unilocular oval shaped radiolucence with corticated margin in the distal of the tooth 48 extending from distal cervical margin of the tooth 48 down to inferior alveolar canal and up to the 1/4 ramus

6. Paradentalcyst 病理特徵 好發位置： mandibular third molar 的 lateral root surface 、靠近 cervical margin 致病原因： uncertain. 可能和 mandible third molar 的 pericoronitis 有關。因為 pericoronitis 造成 pocket inflammation ，刺激到 PDL 最上面的 epithelium 的增生，最 後形成 cyst 。